Schizotypal personality disorder: Difference between revisions

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{{Short description|Schizophrenia-spectrum disorder}}
{{Distinguish|Semantic pragmatic disorder|Schizoid personality disorder|Schizoaffective disorder|Autism spectrum disorder}}
{{Infobox medical condition (new)
{{Infobox medical condition (new)
| name = Schizotypal disorder
| name = Schizotypal personality disorder
| specialty = [[Psychiatry]]
| specialty = [[Psychiatry]]
| synonyms =
| synonyms = Schizotypal disorder
| symptoms = [[Ideas of reference and delusions of reference|Ideas of reference]], [[Magical thinking|unusual beliefs]], [[Illusion|perceptual Illusions]], [[Thought disorder|odd thinking and speech]], [[Suspicion (emotion)|suspiciousness]], [[Paradoxical laughter|inappropriate affect]], [[Eccentricity (behavior)|strange behavior]], [[Loneliness|lack of friends]], [[paranoid]] [[social anxiety]]
| symptoms = [[Ideas of reference and delusions of reference|Ideas of reference]], [[Magical thinking|unusual beliefs]], [[Illusion|perceptual Illusions]], [[Thought disorder|odd thinking and speech]], [[Suspicion (emotion)|suspiciousness]], [[Paradoxical laughter|inappropriate affect]], [[Eccentricity (behavior)|strange behavior]], [[Loneliness|lack of friends]], [[paranoid]] [[social anxiety]]
| complications = [[Schizophrenia]], [[substance use disorder]], [[major depressive disorder]]
| complications = [[Schizophrenia]], [[substance use disorder]], [[major depressive disorder]]
| onset = 10–20 year old
| onset = 10–20 year old
| duration = Lifelong
| duration = Lifelong
| types =
| types =
| causes =
| causes = [[Genetics]]; [[childhood neglect]]; [[childhood abuse]]
| risks = [[Family history (medicine)|Family history]]
| risks = [[Family history (medicine)|Family history]]
| diagnosis =
| diagnosis = Based on symptoms
| differential = [[Personality disorder#Cluster A (odd or eccentric disorders)|Cluster A personality disorders]], [[borderline personality disorder]], [[avoidant personality disorder]], [[autism spectrum disorder]], [[social anxiety disorder]], [[attention deficit hyperactivity disorder predominantly inattentive|ADHD-PI (ADD)]]
| differential = [[Personality disorder#Cluster A (odd or eccentric disorders)|Cluster A personality disorders]], [[borderline personality disorder]], [[avoidant personality disorder]], [[autism spectrum disorder]], [[social anxiety disorder]], [[attention deficit hyperactivity disorder predominantly inattentive|ADHD-PI (ADD)]]
| prevention =
| prevention =
| treatment = [[Cognitive-behavioral therapy]], [[Metacognitive therapy]], [[Cognitive remediation therapy]]
| treatment =
| medication =
| medication = [[Antipsychotics]], [[Antidepressants]]
| prognosis =
| prognosis = Typically poor, although significant improvements can be made
| frequency = Estimated 3% of general population
| frequency = Estimated 3% of general population
| image = Solitude.jpg
| image = Solitude.jpg
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| caption = People with STPD often feel isolated from society.
| caption = People with STPD often feel isolated from society.
}}
}}
{{Distinguish|Semantic pragmatic disorder|Schizoid personality disorder|Schizoaffective disorder|Autism spectrum disorder}}'''Schizotypal personality disorder''' ('''STPD or SPD'''), also known as '''schizotypal disorder''', is a [[Personality disorder|Cluster A Personality disorder]].<ref>{{cite web |author-link1=Norman Sartorius |display-authors=6 |title=The ICD-10 Classification of Mental and Behavioural Disorders Clinical descriptions and diagnostic guidelines |url=https://apps.who.int/iris/bitstream/handle/10665/37958/9241544228_eng.pdf?sequence=8 |access-date=23 June 2021 |website=www.who.int |publisher=[[World Health Organization]] |pages=77, 83–4 |agency=bluebook.doc |vauthors=Sartorius N, Henderson A, Strotzka H, Lipowski Z, Yu-cun S, You-xin X, Strömgren E, Glatzel J, Kühne G, Misès R, Soldatos C, Pull C, Giel R, Jegede R, Malt U, Nadzharov R, Smulevitch A, Hagberg B, Perris C, Scharfetter C, Clare A, Cooper J, Corbett J, Griffith Edwards J, Gelder M, Goldberg D, Gossop M, Graham P, Kendell R, Marks I, Russell G, Rutter M, Shepherd M, West D, Wing J, Wing L, Neki J, Benson F, Cantwell D, Guze S, Helzer J, Holzman P, Kleinman A, Kupfer D, Mezzich J, Spitzer R, Lokar J}}</ref><ref name=":0">{{Cite journal |last=Rosell |first=Daniel R. |last2=Futterman |first2=Shira E. |last3=McMaster |first3=Antonia |last4=Siever |first4=Larry J. |date=2014-05-15 |title=Schizotypal Personality Disorder: A Current Review |url=https://doi.org/10.1007/s11920-014-0452-1 |url-status=live |journal=Current Psychiatry Reports |language=en |volume=16 |issue=7 |pages=452 |doi=10.1007/s11920-014-0452-1 |issn=1535-1645 |pmc=PMC4182925 |pmid=24828284 |archive-url=https://web.archive.org/web/20220929171036/https://link.springer.com/article/10.1007/s11920-014-0452-1 |archive-date=September 29, 2022}}</ref> [[Diagnostic and Statistical Manual of Mental Disorders|DSM]] classification describes the disorder specifically as a [[personality disorder]] characterized by [[thought disorder]], [[paranoia]], a characteristic form of [[social anxiety]], [[derealization]], transient [[psychosis]], and unconventional beliefs. People with this disorder feel pronounced discomfort in forming and maintaining social connections with other people, primarily due to the belief that other people harbor negative thoughts and views about them.<ref name="Schacter">{{cite book |title=Psychology |vauthors=Schacter DL, Gilbert DT, Wegner DM |date=2010 |publisher=Worth Publishers}}</ref> Peculiar speech mannerisms and socially unexpected modes of dress are also characteristic. Schizotypal people may react oddly in conversations, not respond, or talk to themselves.<ref name="Schacter" /> They frequently interpret situations as being strange or [[Ideas and delusions of reference|having unusual meanings for them]]; [[paranormal]] and superstitious beliefs are common. Schizotypal people usually disagree with the suggestion their thoughts and behaviors are a 'disorder', and seek medical attention for depression or anxiety instead. Schizotypal personality disorder occurs in approximately 3% of the general population and is more commonly diagnosed in males.<ref name="pulay">{{cite journal | vauthors = Pulay AJ, Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, Saha TD, Smith SM, Pickering RP, Ruan WJ, Hasin DS, Grant BF | display-authors = 6 | title = Prevalence, correlates, disability, and comorbidity of DSM-IV schizotypal personality disorder: results from the wave 2 national epidemiologic survey on alcohol and related conditions | journal = Primary Care Companion to the Journal of Clinical Psychiatry | volume = 11 | issue = 2 | pages = 53–67 | year = 2009 | pmid = 19617934 | pmc = 2707116 | doi = 10.4088/PCC.08m00679 }}</ref>
{{Personality disorders sidebar}}
{{Personality disorders sidebar}}


== Epidemiology ==
'''Schizotypal personality disorder''' ('''STPD or SPD'''), also known as '''schizotypal disorder''', is a [[mental disorder|mental]] and [[Abnormal behaviour|behavioral]] [[disease#Disorder|disorder]].<ref>{{cite web |url= https://apps.who.int/iris/bitstream/handle/10665/37958/9241544228_eng.pdf?sequence=8 |title= The ICD-10 Classification of Mental and Behavioural Disorders Clinical descriptions and diagnostic guidelines | vauthors = Sartorius N, Henderson A, Strotzka H, Lipowski Z, Yu-cun S, You-xin X, Strömgren E, Glatzel J, Kühne G, Misès R, Soldatos C, Pull C, Giel R, Jegede R, Malt U, Nadzharov R, Smulevitch A, Hagberg B, Perris C, Scharfetter C, Clare A, Cooper J, Corbett J, Griffith Edwards J, Gelder M, Goldberg D, Gossop M, Graham P, Kendell R, Marks I, Russell G, Rutter M, Shepherd M, West D, Wing J, Wing L, Neki J, Benson F, Cantwell D, Guze S, Helzer J, Holzman P, Kleinman A, Kupfer D, Mezzich J, Spitzer R, Lokar J |author-link1=Norman Sartorius | display-authors = 6 |website=www.who.int | publisher = [[World Health Organization]] |agency=bluebook.doc |pages=77, 83–4 |access-date=23 June 2021 }}</ref> [[Diagnostic and Statistical Manual of Mental Disorders|DSM]] classification describes the disorder specifically as a [[personality disorder]] characterized by [[thought disorder]], [[paranoia]], a characteristic form of [[social anxiety]], [[derealization]], transient [[psychosis]], and unconventional beliefs. People with this disorder feel pronounced discomfort in forming and maintaining social connections with other people, primarily due to the belief that other people harbor negative thoughts and views about them.<ref name="Schacter" /> Peculiar speech mannerisms and socially unexpected modes of dress are also characteristic. Schizotypal people may react oddly in conversations, not respond, or talk to themselves.<ref name= Schacter>{{cite book | vauthors = Schacter DL, Gilbert DT, Wegner DM | title = Psychology | publisher = Worth Publishers | date = 2010 }}</ref> They frequently interpret situations as being strange or [[Ideas and delusions of reference|having unusual meaning for them]]; [[paranormal]] and superstitious beliefs are common. Schizotypal people usually disagree with the suggestion their thoughts and behaviors are a 'disorder', and seek medical attention for depression or anxiety instead.<ref name="DSM 5" /> Schizotypal personality disorder occurs in approximately 3% of the general population and is more commonly diagnosed in males.<ref name="pulay" />
The reported prevalence of STPD in community studies ranges from 1.37% in a [[Norway|Norwegian]] sample, to 4.6% in an [[United States|American]] sample.<ref name="DSM 5" /> A large American study found a lifetime prevalence of 3.9%, with somewhat higher rates among men (4.2%) than women (3.7%).<ref name="wave">{{cite journal |display-authors=6 |vauthors=Pulay AJ, Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, Saha TD, Smith SM, Pickering RP, Ruan WJ, Hasin DS, Grant BF |year=2009 |title=Prevalence, correlates, disability, and comorbidity of DSM-IV schizotypal personality disorder: results from the wave 2 national epidemiologic survey on alcohol and related conditions |journal=Primary Care Companion to the Journal of Clinical Psychiatry |volume=11 |issue=2 |pages=53–67 |doi=10.4088/PCC.08m00679 |pmc=2707116 |pmid=19617934}}</ref> It may be uncommon in clinical populations, with reported rates of up to 1.9%.<ref name="DSM 5" /> It has been estimated to be somewhere between 0% and 5.2% of the general population.<ref>{{Cite journal |last=Pulay |first=Attila J. |last2=Stinson |first2=Frederick S. |last3=Dawson |first3=Deborah A. |last4=Goldstein |first4=Risë B. |last5=Chou |first5=S. Patricia |last6=Huang |first6=Boji |last7=Saha |first7=Tulshi D. |last8=Smith |first8=Sharon M. |last9=Pickering |first9=Roger P. |last10=Ruan |first10=W. June |last11=Hasin |first11=Deborah S. |last12=Grant |first12=Bridget F. |date=2009-04-16 |title=Prevalence, Correlates, Disability, and Comorbidity of DSM-IV Schizotypal Personality Disorder: Results From the Wave 2 National Epidemiologic Survey on Alcohol and Related Conditions |url=https://www.psychiatrist.com/pcc/personality/prevalence-correlates-disability-comorbidity-dsm-iv/ |journal=The Primary Care Companion for CNS Disorders |language=English |volume=11 |issue=2 |pages=22752 |doi=10.4088/PCC.08m00679 |issn=2155-7780}}</ref> Together with other [[Personality disorder#Personality clusters|cluster A]] personality disorders, it is also very common among [[Homelessness|homeless people]] who show up at drop-in centers, according to a 2008 New York study. The study did not address homeless people who do not show up at drop-in centers.<ref>{{cite journal |vauthors=Connolly AJ, Cobb-Richardson P, Ball SA |date=December 2008 |title=Personality disorders in homeless drop-in center clients |url=http://www.ncsinc.org/images/pdfs/JPD_article_winter_2008.pdf |url-status=dead |journal=Journal of Personality Disorders |volume=22 |issue=6 |pages=573–588 |doi=10.1521/pedi.2008.22.6.573 |pmid=19072678 |archive-url=https://web.archive.org/web/20090617134208/http://www.ncsinc.org/images/pdfs/JPD_article_winter_2008.pdf |archive-date=2009-06-17}}</ref> Schizotypal disorder may be [[Overdiagnosis|overdiagnosed]] in [[Russia]] and other [[post-Soviet states]].<ref>Быкова А. Ю., Беккер Р. А., Быков Ю. В. О трудностях дифференциальной диагностики между первичным деперсонализационно-дереализационным расстройством и шизотипическим расстройством // Siberian Journal of Life Sciences & Agriculture. — 2022. — Т. 14. — №. 1.</ref>


== History ==
== Prognosis ==
People with StPD usually had symptoms of schizotypal personality disorder in childhood.<ref>{{Cite journal |last=Jones |first=Harvey P. |last2=Testa |first2=Renee R. |last3=Ross |first3=Nola |last4=Seal |first4=Marc L. |last5=Pantelis |first5=Christos |last6=Tonge |first6=Bruce |date=2015-01-06 |title=The Melbourne Assessment of Schizotypy in Kids: A Useful Measure of Childhood Schizotypal Personality Disorder |url=https://www.hindawi.com/journals/bmri/2015/635732/ |journal=BioMed Research International |language=en |volume=2015 |pages=e635732 |doi=10.1155/2015/635732 |issn=2314-6133}}</ref> Traits of StPD usually remain consistently present over time,<ref>{{Cite journal |last=Shea |first=M. Tracie |last2=Stout |first2=Robert |last3=Gunderson |first3=John |last4=Morey |first4=Leslie C. |last5=Grilo |first5=Carlos M. |last6=McGlashan |first6=Thomas |last7=Skodol |first7=Andrew E. |last8=Dolan-Sewell |first8=Regina |last9=Dyck |first9=Ingrid |last10=Zanarini |first10=Mary C. |last11=Keller |first11=Martin B. |date=2002-12-01 |title=Short-Term Diagnostic Stability of Schizotypal, Borderline, Avoidant, and Obsessive-Compulsive Personality Disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.159.12.2036 |journal=American Journal of Psychiatry |volume=159 |issue=12 |pages=2036–2041 |doi=10.1176/appi.ajp.159.12.2036 |issn=0002-953X}}</ref><ref>{{Cite web |last=Alphen |first=S. P. J. van |last2=Heijnen-Kohl |first2=S. M. J. |date=2019-01-25 |title=Personality Disorders in Later Life |url=https://oxfordre.com/psychology/view/10.1093/acrefore/9780190236557.001.0001/acrefore-9780190236557-e-420 |access-date=2022-10-28 |website=Oxford Research Encyclopedia of Psychology |language=en |doi=10.1093/acrefore/9780190236557.001.0001/acrefore-9780190236557-e-420?rskey=5dyccq}}</ref> although can fluctuate greatly in severity and stability.<ref>{{Cite journal |last=Grilo |first=Carlos M. |last2=Sanislow |first2=Charles A. |last3=Gunderson |first3=John G. |last4=Pagano |first4=Maria E. |last5=Yen |first5=Shirley |last6=Zanarini |first6=Mary C. |last7=Shea |first7=M. Tracie |last8=Skodol |first8=Andrew E. |last9=Stout |first9=Robert L. |last10=Morey |first10=Leslie C. |last11=McGlashan |first11=Thomas H. |date=2004 |title=Two-year stability and change of schizotypal, borderline, avoidant, and obsessive-compulsive personality disorders |url=https://pubmed.ncbi.nlm.nih.gov/15482035/ |journal=Journal of Consulting and Clinical Psychology |volume=72 |issue=5 |pages=767–775 |doi=10.1037/0022-006X.72.5.767 |issn=0022-006X |pmc=3289406 |pmid=15482035}}</ref><ref>{{Cite journal |last=McGlashan |first=Thomas H. |last2=Grilo |first2=Carlos M. |last3=Sanislow |first3=Charles A. |last4=Ralevski |first4=Elizabeth |last5=Morey |first5=Leslie C. |last6=Gunderson |first6=John G. |last7=Skodol |first7=Andrew E. |last8=Shea |first8=M. Tracie |last9=Zanarini |first9=Mary C. |last10=Bender |first10=Donna |last11=Stout |first11=Robert L. |last12=Yen |first12=Shirley |last13=Pagano |first13=Maria |date=2005-05-01 |title=Two-Year Prevalence and Stability of Individual DSM-IV Criteria for Schizotypal, Borderline, Avoidant, and Obsessive-Compulsive Personality Disorders: Toward a Hybrid Model of Axis II Disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.162.5.883 |journal=American Journal of Psychiatry |volume=162 |issue=5 |pages=883–889 |doi=10.1176/appi.ajp.162.5.883 |issn=0002-953X}}</ref> There may be [[Sex differences in humans|gender differences]] in the symptomology of men and women with [[Schizotypal personality disorder]].<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=Seidman |first5=Larry J. |last6=Demeo |first6=Susan |last7=Frumin |first7=Melissa |last8=Shenton |first8=Martha E. |date=2003-12-01 |title=An MRI Study of Superior Temporal Gyrus Volume in Women With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.160.12.2198 |journal=American Journal of Psychiatry |volume=160 |issue=12 |pages=2198–2201 |doi=10.1176/appi.ajp.160.12.2198 |issn=0002-953X}}</ref> Women with the disorder might be more likely to have less severe [[Cognitive deficit|cognitive deficits]], and more severe [[social anxiety]] and [[magical thinking]].<ref>{{Cite journal |last=Voglmaier |first=Martina M. |last2=Seidman |first2=Larry J. |last3=Niznikiewicz |first3=Margaret A. |last4=Dickey |first4=Chandlee C. |last5=Shenton |first5=Martha E. |last6=McCarley |first6=Robert W. |date=2005-04-01 |title=A comparative profile analysis of neuropsychological function in men and women with schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996404003482 |journal=Schizophrenia Research |language=en |volume=74 |issue=1 |pages=43–49 |doi=10.1016/j.schres.2004.09.013 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Voglmaier |first=Martina M. |last2=Seidman |first2=Larry J. |last3=Niznikiewicz |first3=Margaret A. |last4=Madan |first4=Anita |last5=Dickey |first5=Chandlee C. |last6=Shenton |first6=Martha E. |last7=McCarley |first7=Robert W. |date=2009-12-01 |title=Dichotic listening in schizotypal personality disorder: Evidence for gender and laterality effects |url=https://www.sciencedirect.com/science/article/pii/S0920996409002138 |journal=Schizophrenia Research |language=en |volume=115 |issue=2 |pages=290–292 |doi=10.1016/j.schres.2009.04.028 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Bora |first=Emre |last2=Baysan Arabaci |first2=Leyla |date=2009 |title=Effect of age and gender on schizotypal personality traits in the normal population: Schizotypy and age |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1440-1819.2009.02011.x |journal=Psychiatry and Clinical Neurosciences |language=en |volume=63 |issue=5 |pages=663–669 |doi=10.1111/j.1440-1819.2009.02011.x}}</ref> People with StPD are more likely to only have a [[Secondary school|high school education]], to be unemployed,<ref>{{Cite journal |last=McClure |first=Margaret M. |last2=Harvey |first2=Philip D. |last3=Bowie |first3=Christopher R. |last4=Iacoviello |first4=Brian |last5=Siever |first5=Larry J. |date=2013-03-01 |title=Functional outcomes, functional capacity, and cognitive impairment in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996412007050 |journal=Schizophrenia Research |language=en |volume=144 |issue=1 |pages=146–150 |doi=10.1016/j.schres.2012.12.012 |issn=0920-9964 |via=[[Elsevier Science Direct]]}}</ref> and to have significant [[Disability|functional impairment]].<ref>{{Cite journal |last=Skodol |first=Andrew E. |last2=Gunderson |first2=John G. |last3=McGlashan |first3=Thomas H. |last4=Dyck |first4=Ingrid R. |last5=Stout |first5=Robert L. |last6=Bender |first6=Donna S. |last7=Grilo |first7=Carlos M. |last8=Shea |first8=M. Tracie |last9=Zanarini |first9=Mary C. |last10=Morey |first10=Leslie C. |last11=Sanislow |first11=Charles A. |last12=Oldham |first12=John M. |date=2002-02-01 |title=Functional Impairment in Patients With Schizotypal, Borderline, Avoidant, or Obsessive-Compulsive Personality Disorder |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.159.2.276 |journal=American Journal of Psychiatry |volume=159 |issue=2 |pages=276–283 |doi=10.1176/appi.ajp.159.2.276 |issn=0002-953X}}</ref> The two traits of StPD which are least likely to change are paranoia and abnormal experiences.<ref>{{Cite journal |last=McGlashan |first=Thomas H. |last2=Grilo |first2=Carlos M. |last3=Sanislow |first3=Charles A. |last4=Ralevski |first4=Elizabeth |last5=Morey |first5=Leslie C. |last6=Gunderson |first6=John G. |last7=Skodol |first7=Andrew E. |last8=Shea |first8=M. Tracie |last9=Zanarini |first9=Mary C. |last10=Bender |first10=Donna |last11=Stout |first11=Robert L. |last12=Yen |first12=Shirley |last13=Pagano |first13=Maria |date=2005-05-01 |title=Two-Year Prevalence and Stability of Individual DSM-IV Criteria for Schizotypal, Borderline, Avoidant, and Obsessive-Compulsive Personality Disorders: Toward a Hybrid Model of Axis II Disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.162.5.883 |journal=American Journal of Psychiatry |volume=162 |issue=5 |pages=883–889 |doi=10.1176/appi.ajp.162.5.883 |issn=0002-953X}}</ref>
The term "schizotype" was first coined by [[Sandor Rado]] in 1956 as a [[portmanteau]] of "''schizo''phrenic [[phenotype|pheno''type'']]".<ref name="Millon 11">{{cite book |title=Personality disorders in modern life |vauthors=Millon T |publisher=Wiley |year=2004 |isbn=978-0-471-23734-1 |page=403 |chapter=Chapter 12 – The Schizotypal Personality |oclc=57291241 |author-link=Theodore Millon |chapter-url=http://dlia.ir/Scientific/e_book/Medicine/Internal_Medicine/RC_435_571_Psychiatry_/017437.pdf#420 |archive-url=https://web.archive.org/web/20170207112700/http://dlia.ir/Scientific/e_book/Medicine/Internal_Medicine/RC_435_571_Psychiatry_/017437.pdf |archive-date=2017-02-07}}</ref> STPD is classified as a [[cluster A]] personality disorder, also known as the "odd or eccentric" cluster.


== Etiology ==
STPD as a proper diagnosis was first introduced in 1980, with the release of the DSM-III. The diagnosis was created to fill the gap between [[Borderline personality disorder|Borderline Personality Disorder]] (BPD) and moderate schizophrenia-like symptoms. Because of this, many early studies were either seeking to distinguish it from other diagnoses, specifically BPD, or identify its utility in recognizing non-clinical people who were genetically predisposed to schizophrenia.<ref name=":2" />


=== Genetic ===
Very few changes were made from the DSM-IV-TR to the DSM-V in terms of the diagnostic criteria.<ref name=":2" />
People who have relatives with [[schizotypy]],<ref>{{Cite journal |last=Debbané |first=Martin |last2=Eliez |first2=Stephan |last3=Badoud |first3=Deborah |last4=Conus |first4=Philippe |last5=Flückiger |first5=Rahel |last6=Schultze-Lutter |first6=Frauke |date=2015 |title=Developing psychosis and its risk states through the lens of schizotypy |url=https://pubmed.ncbi.nlm.nih.gov/25548386/ |journal=Schizophrenia Bulletin |volume=41 Suppl 2 |pages=S396–407 |doi=10.1093/schbul/sbu176 |issn=1745-1701 |pmc=4373628 |pmid=25548386}}</ref><ref>{{Cite journal |last=Schultze-Lutter |first=Frauke |last2=Nenadic |first2=Igor |last3=Grant |first3=Phillip |date=2019 |title=Psychosis and Schizophrenia-Spectrum Personality Disorders Require Early Detection on Different Symptom Dimensions |url=https://www.frontiersin.org/articles/10.3389/fpsyt.2019.00476 |journal=Frontiers in Psychiatry |volume=10 |doi=10.3389/fpsyt.2019.00476/full |issn=1664-0640}}</ref><ref>{{Cite journal |last=Kemp |first=Kathryn C. |last2=Bathery |first2=Alyssa J. |last3=Barrantes-Vidal |first3=Neus |last4=Kwapil |first4=Thomas R. |date=2020-08-10 |title=A brief questionnaire measure of multidimensional schizotypy predicts interview-rated symptoms and impairment |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0237614 |journal=PLOS ONE |language=en |volume=15 |issue=8 |pages=e0237614 |doi=10.1371/journal.pone.0237614 |issn=1932-6203 |pmc=PMC7416934 |pmid=32776979}}</ref> [[Mood disorder|mood disorders]],<ref>{{Cite journal |last=Squires-Wheeler |first=E. |last2=Skodol |first2=A. E. |last3=Bassett |first3=A. |last4=Erlenmeyer-Kimling |first4=L. |date=1989 |title=DSM-III-R schizotypal personality traits in offspring of schizophrenic disorder, affective disorder, and normal control parents |url=https://pubmed.ncbi.nlm.nih.gov/2635220/ |journal=Journal of Psychiatric Research |volume=23 |issue=3-4 |pages=229–239 |doi=10.1016/0022-3956(89)90028-9 |issn=0022-3956 |pmc=3160972 |pmid=2635220}}</ref> or other disorders on the [[Spectrum disorder|Schizophrenia spectrum]] are at a higher likelihood of developing StPD.<ref>{{Cite journal |last=Tarbox |first=Sarah I. |last2=Pogue-Geile |first2=Michael F. |date=2011-11-01 |title=A multivariate perspective on schizotypy and familial association with schizophrenia: A review |url=https://www.sciencedirect.com/science/article/pii/S0272735811001103 |journal=Clinical Psychology Review |language=en |volume=31 |issue=7 |pages=1169–1182 |doi=10.1016/j.cpr.2011.07.002 |issn=0272-7358}}</ref><ref>{{Cite journal |last=Kemp |first=Kathryn C. |last2=Bathery |first2=Alyssa J. |last3=Barrantes-Vidal |first3=Neus |last4=Kwapil |first4=Thomas R. |date=2020-08-10 |title=A brief questionnaire measure of multidimensional schizotypy predicts interview-rated symptoms and impairment |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0237614 |journal=PLOS ONE |language=en |volume=15 |issue=8 |pages=e0237614 |doi=10.1371/journal.pone.0237614 |issn=1932-6203 |pmc=PMC7416934 |pmid=32776979}}</ref><ref>{{Cite journal |last=Torti |first=Maria Chiara |last2=Buzzanca |first2=Antonino |last3=Squarcione |first3=Chiara |last4=Salerno |first4=Carla |last5=Mirigliani |first5=Alessia |last6=Di Fabio |first6=Fabio |last7=Biondi |first7=Massimo |date=2013-10-04 |title=Schizotypy and personality profiles of Cluster A in a group of schizophrenic patients and their siblings |url=https://doi.org/10.1186/1471-244X-13-245 |journal=BMC Psychiatry |volume=13 |issue=1 |pages=245 |doi=10.1186/1471-244X-13-245 |issn=1471-244X |pmc=PMC3856523 |pmid=24094118}}</ref> Although environmental factors likely play an important role in the onset of the disorder. The [[Rs4680|COMT Val158Met]] [[Polymorphism (biology)|polymorphism]] and its Val or Met [[allele]] are suspected to be associated with Schizotypal personality disorder.<ref>{{Cite journal |last=Skilleter |first=Ashley Jayne |last2=Weickert |first2=Cynthia Shannon |last3=Moustafa |first3=Ahmed Abdelhalim |last4=Gendy |first4=Rasha |last5=Chan |first5=Mico |last6=Arifin |first6=Nur |last7=Mitchell |first7=Philip Bowden |last8=Weickert |first8=Thomas Wesley |date=2014-11-01 |title=BDNF val66met genotype and schizotypal personality traits interact to influence probabilistic association learning |url=https://www.sciencedirect.com/science/article/pii/S0166432814004902 |journal=Behavioural Brain Research |language=en |volume=274 |pages=137–142 |doi=10.1016/j.bbr.2014.07.041 |issn=0166-4328}}</ref><ref>{{Cite journal |last=Siever |first=Larry J. |date=2005 |title=Endophenotypes in the personality disorders |url=https://pubmed.ncbi.nlm.nih.gov/16262209/ |journal=Dialogues in Clinical Neuroscience |volume=7 |issue=2 |pages=139–151 |issn=1294-8322 |pmc=3181730 |pmid=16262209}}</ref><ref>{{Cite journal |last=Docherty |first=Anna R. |last2=Sponheim |first2=Scott R. |date=2008 |title=Anhedonia as a phenotype for the Val158Met COMT polymorphism in relatives of patients with schizophrenia |url=https://pubmed.ncbi.nlm.nih.gov/19025226/ |journal=Journal of Abnormal Psychology |volume=117 |issue=4 |pages=788–798 |doi=10.1037/a0013745 |issn=0021-843X |pmc=2936689 |pmid=19025226}}</ref><ref>{{Cite journal |last=Leung |first=Winnie W. |last2=McClure |first2=Margaret M. |last3=Siever |first3=Larry J. |last4=Barch |first4=Deanna M. |last5=Harvey |first5=Philip D. |date=2008-01-15 |title=Catechol-O-methyltransferase Val158Met genotype in healthy and personality disorder individuals: Preliminary results from an examination of cognitive tests hypothetically differentially sensitive to dopamine functions |url=https://www.dovepress.com/catechol-o-methyltransferase-val158met-genotype-in-healthy-and-persona-peer-reviewed-fulltext-article-NDT |journal=Neuropsychiatric Disease and Treatment |language=English |volume=3 |issue=6 |pages=925–934 |doi=10.2147/NDT.S1500}}</ref> This is because these genes affect dopamine production in the brain.<ref>{{Cite journal |last=Sheldrick |first=A. J. |last2=Krug |first2=A. |last3=Markov |first3=V. |last4=Leube |first4=D. |last5=Michel |first5=T. M. |last6=Zerres |first6=K. |last7=Eggermann |first7=T. |last8=Kircher |first8=T. |date=2008 |title=Effect of COMT val158met genotype on cognition and personality |url=https://www.cambridge.org/core/journals/european-psychiatry/article/abs/effect-of-comt-val158met-genotype-on-cognition-and-personality/CA49000C83145DCAB755F4F71D85A213 |journal=European Psychiatry |language=en |volume=23 |issue=6 |pages=385–389 |doi=10.1016/j.eurpsy.2008.05.002 |issn=0924-9338 |via=[[Cambridge Core]]}}</ref><ref>{{Cite journal |last=Steiner |first=Genevieve Z. |last2=Fernandez |first2=Francesca M. |last3=Coles |first3=Madilyn |last4=Karamacoska |first4=Diana |last5=Barkus |first5=Emma |last6=Broyd |first6=Samantha J. |last7=Solowij |first7=Nadia |last8=Watson |first8=Owen T. |last9=Chiu |first9=Christine L. |last10=Lind |first10=Joanne M. |last11=Barry |first11=Robert J. |date=2019-07-05 |title=Interrogating the Relationship Between Schizotypy, the Catechol-O-Methyltransferase (COMT) Val158Met Polymorphism, and Neuronal Oscillatory Activity |url=https://pubmed.ncbi.nlm.nih.gov/30084963/ |journal=Cerebral Cortex (New York, N.Y.: 1991) |volume=29 |issue=7 |pages=3048–3058 |doi=10.1093/cercor/bhy171 |issn=1460-2199 |pmid=30084963}}</ref><ref>{{Cite journal |last=Barnett |first=J. H. |last2=Jones |first2=P. B. |last3=Robbins |first3=T. W. |last4=Müller |first4=U. |date=2007 |title=Effects of the catechol-O-methyltransferase Val158Met polymorphism on executive function: a meta-analysis of the Wisconsin Card Sort Test in schizophrenia and healthy controls |url=https://www.nature.com/articles/4001973 |journal=Molecular Psychiatry |language=en |volume=12 |issue=5 |pages=502–509 |doi=10.1038/sj.mp.4001973 |issn=1476-5578}}</ref> Which is a [[neurochemical]] thought to be associated with schizotypal traits.<ref>{{Cite journal |last=Silberschmidt |first=Amy L. |last2=Sponheim |first2=Scott R. |date=2008-03-01 |title=Personality in relation to genetic liability for schizophrenia and bipolar disorder: Differential associations with the COMT Val108/158Met polymorphism |url=https://www.sciencedirect.com/science/article/pii/S0920996407010377 |journal=Schizophrenia Research |language=en |volume=100 |issue=1 |pages=316–324 |doi=10.1016/j.schres.2007.12.467 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Giakoumaki |first=Stella G. |last2=Roussos |first2=Panos |last3=Bitsios |first3=Panos |date=2008 |title=Improvement of Prepulse Inhibition and Executive Function by the COMT Inhibitor Tolcapone Depends on COMT Val158Met Polymorphism |url=https://www.nature.com/articles/npp200882 |journal=Neuropsychopharmacology |language=en |volume=33 |issue=13 |pages=3058–3068 |doi=10.1038/npp.2008.82 |issn=1740-634X |via=[[Nature (journal)|Nature]]}}</ref> The gene may also contribute to decreased levels of gray matter in the [[prefrontal cortex]].<ref>{{Cite journal |last=Rodríguez-Toscano |first=Elisa |last2=Martínez |first2=Kenia |last3=Fraguas |first3=David |last4=Janssen |first4=Joost |last5=Pina-Camacho |first5=Laura |last6=Arias |first6=Bárbara |last7=Vieta |first7=Eduard |last8=Mezquida |first8=Gisela |last9=Amoretti |first9=Silvia |last10=Bernardo |first10=Miguel |last11=Castro-Fornieles |first11=Josefina |last12=Cuesta-Zorita |first12=Manuel Jesús |last13=Lobo |first13=Antonio |last14=González-Pinto |first14=Ana |last15=Collado |first15=Iluminada Corripio |date=2022-04-01 |title=Prefrontal abnormalities, executive dysfunction and symptoms severity are modulated by COMT Val158Met polymorphism in first episode psychosis |url=https://www.sciencedirect.com/science/article/pii/S1888989121001245 |journal=Revista de Psiquiatría y Salud Mental |language=en |volume=15 |issue=2 |pages=74–87 |doi=10.1016/j.rpsm.2021.11.002 |issn=1888-9891}}</ref><ref>{{Cite journal |last=Thermenos |first=H.W. |last2=Keshavan |first2=M.S. |last3=Juelich |first3=R.J. |last4=Molokotos |first4=E. |last5=Whitfield-Gabrieli |first5=S. |last6=Brent |first6=B.K. |last7=Makris |first7=N. |last8=Seidman |first8=L.J. |date=2013 |title=A review of neuroimaging studies of young relatives of individuals with schizophrenia: A developmental perspective from schizotaxia to schizophrenia |url=https://onlinelibrary.wiley.com/doi/10.1002/ajmg.b.32170 |journal=American Journal of Medical Genetics Part B: Neuropsychiatric Genetics |language=en |volume=162 |issue=7 |pages=604–635 |doi=10.1002/ajmg.b.32170 |via=[[Wiley Online Library]]}}</ref> This may lead to impaired capacities for decision-making,<ref>{{Cite journal |last=Roussos |first=P. |last2=Giakoumaki |first2=S. G. |last3=Rogdaki |first3=M. |last4=Pavlakis |first4=S. |last5=Frangou |first5=S. |last6=Bitsios |first6=P. |date=2008 |title=Prepulse inhibition of the startle reflex depends on the catechol O-methyltransferase Val158Met gene polymorphism |url=https://www.cambridge.org/core/journals/psychological-medicine/article/abs/prepulse-inhibition-of-the-startle-reflex-depends-on-the-catechol-omethyltransferase-val158met-gene-polymorphism/3B0905EDAE98D7A46FB24FACD68C638F |journal=Psychological Medicine |language=en |volume=38 |issue=11 |pages=1651–1658 |doi=10.1017/S0033291708002912 |issn=1469-8978 |via=[[Cambridge Core]]}}</ref> speech,<ref>{{Cite journal |last=Krug |first=Axel |last2=Markov |first2=Valentin |last3=Sheldrick |first3=Abigail |last4=Krach |first4=Sören |last5=Jansen |first5=Andreas |last6=Zerres |first6=Klaus |last7=Eggermann |first7=Thomas |last8=Stöcker |first8=Tony |last9=Shah |first9=N. Jon |last10=Kircher |first10=Tilo |date=2009-04-21 |title=The effect of the COMT val158met polymorphism on neural correlates of semantic verbal fluency |url=https://doi.org/10.1007/s00406-009-0010-8 |journal=European Archives of Psychiatry and Clinical Neuroscience |language=en |volume=259 |issue=8 |pages=459 |doi=10.1007/s00406-009-0010-8 |issn=1433-8491 |via=[[SpringerLink]]}}</ref> [[cognitive flexibility]],<ref>{{Cite journal |last=Nolan |first=Karen A. |last2=Bilder |first2=Robert M. |last3=Lachman |first3=Herbert M. |last4=Volavka |first4=Jan |date=2004-02-01 |title=Catechol O-Methyltransferase Val158Met Polymorphism in Schizophrenia: Differential Effects of Val and Met Alleles on Cognitive Stability and Flexibility |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.161.2.359 |journal=American Journal of Psychiatry |volume=161 |issue=2 |pages=359–361 |doi=10.1176/appi.ajp.161.2.359 |issn=0002-953X |via=[[American Psychiatric Association]]}}</ref> and altered perceptual experiences.<ref>{{Cite journal |last=Demily |first=Caroline |last2=Louchart-de-la-Chapelle |first2=Sandrine |last3=Nkam |first3=Irène |last4=Ramoz |first4=Nicolas |last5=Denise |first5=Pierre |last6=Nicolas |first6=Alain |last7=Savalle |first7=Caroline |last8=Thibaut |first8=Florence |date=2016-12-30 |title=Does COMT val158met polymorphism influence P50 sensory gating, eye tracking or saccadic inhibition dysfunctions in schizophrenia? |url=https://www.sciencedirect.com/science/article/pii/S016517811630107X |journal=Psychiatry Research |language=en |volume=246 |pages=738–744 |doi=10.1016/j.psychres.2016.07.066 |issn=0165-1781}}</ref> The rs1006737 [[Polymorphism (biology)|polymorphism]] of the [[Cav1.2|CACNA1C]] gene is also believed to have a part in schizotypal symptoms.<ref>{{Cite journal |last=Krautheim |first=Johannes T. |last2=Straube |first2=Benjamin |last3=Dannlowski |first3=Udo |last4=Pyka |first4=Martin |last5=Schneider-Hassloff |first5=Henriette |last6=Drexler |first6=Rebecca |last7=Krug |first7=Axel |last8=Sommer |first8=Jens |last9=Rietschel |first9=Marcella |last10=Witt |first10=Stephanie H. |last11=Kircher |first11=Tilo |date=2018-03-01 |title=Outgroup emotion processing in the vACC is modulated by childhood trauma and CACNA1C risk variant |url=https://pubmed.ncbi.nlm.nih.gov/29385621/ |journal=Social Cognitive and Affective Neuroscience |volume=13 |issue=3 |pages=341–348 |doi=10.1093/scan/nsy004 |issn=1749-5024 |pmc=5836282 |pmid=29385621}}</ref> It may lead to a significantly increased [[Physiology|physiological]] response to [[Stress (biology)|stress]] through the [[cortisol awakening response]] in the brain.<ref>{{Cite journal |last=Klaus |first=K. |last2=Butler |first2=K. |last3=Gutierrez |first3=H. |last4=Durrant |first4=S. J. |last5=Pennington |first5=K. |date=2018-07-01 |title=Interactive effects of early life stress and CACNA1C genotype on cortisol awakening response |url=https://www.sciencedirect.com/science/article/pii/S030105111830365X |journal=Biological Psychology |language=en |volume=136 |pages=22–28 |doi=10.1016/j.biopsycho.2018.05.002 |issn=0301-0511}}</ref><ref>{{Cite thesis |title=Investigating Individual Differences in Acute Psychosocial Stress Reactivity and Evaluation of Wearable Devices for Heart Rate Variability Measurement |url=https://eprints.lincoln.ac.uk/id/eprint/48484/ |publisher=University of Lincoln |date=2021 |degree=mres |language=en |first=Molly Anna |last=Youngs}}</ref><ref>{{Cite journal |last=Weinstein |first=Dana Davis |last2=Diforio |first2=Donald |last3=Schiffman |first3=Jason |last4=Walker |first4=Elaine |last5=Bonsall |first5=Robert |date=1999-04-01 |title=Minor Physical Anomalies, Dermatoglyphic Asymmetries, and Cortisol Levels in Adolescents With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.156.4.617 |journal=American Journal of Psychiatry |volume=156 |issue=4 |pages=617–623 |doi=10.1176/ajp.156.4.617 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Pasparakis |first=E. |last2=Koiliari |first2=E. |last3=Zouraraki |first3=C. |last4=Tsapakis |first4=E.-M. |last5=Roussos |first5=P. |last6=Giakoumaki |first6=S. G. |last7=Bitsios |first7=P. |date=2015 |title=The effects of the CACNA1C rs1006737 A/G on affective startle modulation in healthy males |url=https://www.cambridge.org/core/journals/european-psychiatry/article/abs/effects-of-the-cacna1c-rs1006737-ag-on-affective-startle-modulation-in-healthy-males/6E9E7AD2B77A5347A56DCFCD9FD7770C |journal=European Psychiatry |language=en |volume=30 |issue=4 |pages=492–498 |doi=10.1016/j.eurpsy.2015.03.004 |issn=0924-9338 |via=[[Cambridge Core]]}}</ref> It may also negatively affect reward processing in the brain and lead to [[anhedonia]] or [[Depression (mood)|depression]] in patients.<ref>{{Cite journal |last=Lancaster |first=T. M. |last2=Heerey |first2=E. A. |last3=Mantripragada |first3=K. |last4=Linden |first4=D. E. J. |date=2014 |title=CACNA1C risk variant affects reward responsiveness in healthy individuals |url=https://www.nature.com/articles/tp2014100 |journal=Translational Psychiatry |language=en |volume=4 |issue=10 |pages=e461–e461 |doi=10.1038/tp.2014.100 |issn=2158-3188}}</ref><ref>{{Cite journal |last=Green |first=E. K. |last2=Grozeva |first2=D. |last3=Jones |first3=I. |last4=Jones |first4=L. |last5=Kirov |first5=G. |last6=Caesar |first6=S. |last7=Gordon-Smith |first7=K. |last8=Fraser |first8=C. |last9=Forty |first9=L. |last10=Russell |first10=E. |last11=Hamshere |first11=M. L. |last12=Moskvina |first12=V. |last13=Nikolov |first13=I. |last14=Farmer |first14=A. |last15=McGuffin |first15=P. |date=2010 |title=The bipolar disorder risk allele at CACNA1C also confers risk of recurrent major depression and of schizophrenia |url=https://www.nature.com/articles/mp200949 |journal=Molecular Psychiatry |language=en |volume=15 |issue=10 |pages=1016–1022 |doi=10.1038/mp.2009.49 |issn=1476-5578}}</ref> These factors possibly lead to the development of Schizotypal traits.<ref>{{Cite journal |last=Roussos |first=Panos |last2=Bitsios |first2=Panos |last3=Giakoumaki |first3=Stella G. |last4=McClure |first4=Margaret M. |last5=Hazlett |first5=Erin A. |last6=New |first6=Antonia S. |last7=Siever |first7=Larry J. |date=2013-03-30 |title=CACNA1C as a risk factor for schizotypal personality disorder and schizotypy in healthy individuals |url=https://www.sciencedirect.com/science/article/pii/S0165178112004714 |journal=Psychiatry Research |language=en |volume=206 |issue=1 |pages=122–123 |doi=10.1016/j.psychres.2012.08.039 |issn=0165-1781}}</ref> The [[Zinc finger|zinc-finger protein]] [[Zinc finger protein 804A|ZNF804A]] likely affects the levels of [[paranoia]], [[anxiety]], and [[Ideas and delusions of reference|ideas of reference]] in StPD.<ref>{{Cite journal |last=Stefanis |first=Nicholas C. |last2=Hatzimanolis |first2=Alex |last3=Avramopoulos |first3=Dimitrios |last4=Smyrnis |first4=Nikolaos |last5=Evdokimidis |first5=Ioannis |last6=Stefanis |first6=Costas N. |last7=Weinberger |first7=Daniel R. |last8=Straub |first8=Richard E. |date=2013 |title=Variation in psychosis gene ZNF804A is associated with a refined schizotypy phenotype but not neurocognitive performance in a large young male population |url=https://pubmed.ncbi.nlm.nih.gov/23155182/ |journal=Schizophrenia Bulletin |volume=39 |issue=6 |pages=1252–1260 |doi=10.1093/schbul/sbs110 |issn=1745-1701 |pmc=3796069 |pmid=23155182 |via=[[PubMed]]}}</ref><ref>{{Cite journal |last=Lencz |first=Todd |last2=Szeszko |first2=Philip R. |last3=DeRosse |first3=Pamela |last4=Burdick |first4=Katherine E. |last5=Bromet |first5=Evelyn J. |last6=Bilder |first6=Robert M. |last7=Malhotra |first7=Anil K. |date=2010 |title=A Schizophrenia Risk Gene, ZNF804A, Influences Neuroanatomical and Neurocognitive Phenotypes |url=https://www.nature.com/articles/npp2010102 |journal=Neuropsychopharmacology |language=en |volume=35 |issue=11 |pages=2284–2291 |doi=10.1038/npp.2010.102 |issn=1740-634X}}</ref><ref>{{Cite journal |last=Yasuda |first=Yuka |last2=Hashimoto |first2=Ryota |last3=Ohi |first3=Kazutaka |last4=Fukumoto |first4=Motoyuki |last5=Umeda-Yano |first5=Satomi |last6=Yamamori |first6=Hidenaga |last7=Okochi |first7=Tomo |last8=Iwase |first8=Masao |last9=Kazui |first9=Hiroaki |last10=Iwata |first10=Nakao |last11=Takeda |first11=Masatoshi |date=2011-05-20 |title=Impact on schizotypal personality trait of a genome-wide supported psychosis variant of the ZNF804A gene |url=https://www.sciencedirect.com/science/article/pii/S0304394011003831 |journal=Neuroscience Letters |language=en |volume=495 |issue=3 |pages=216–220 |doi=10.1016/j.neulet.2011.03.069 |issn=0304-3940}}</ref> This gene is also thought to negatively impact [[attention]] in people with StPD.<ref>{{Cite journal |last=del Re |first=E. C. |last2=Bergen |first2=S. E. |last3=Mesholam-Gately |first3=R. I. |last4=Niznikiewicz |first4=M. A. |last5=Goldstein |first5=J. M. |last6=Woo |first6=T. U. |last7=Shenton |first7=M. E. |last8=Seidman |first8=L. J. |last9=McCarley |first9=R. W. |last10=Petryshen |first10=T. L. |date=2014 |title=Analysis of schizophrenia-related genes and electrophysiological measures reveals ZNF804A association with amplitude of P300b elicited by novel sounds |url=https://www.nature.com/articles/tp2013117 |journal=Translational Psychiatry |language=en |volume=4 |issue=1 |pages=e346–e346 |doi=10.1038/tp.2013.117 |issn=2158-3188}}</ref> It may lead to an increased level of [[white matter]] volume in the frontal lobe.<ref>{{Cite journal |last=Wassink |first=Thomas H. |last2=Epping |first2=Eric A. |last3=Rudd |first3=Danielle |last4=Axelsen |first4=Michael |last5=Ziebell |first5=Stephen |last6=Fleming |first6=Frank W. |last7=Monson |first7=Eric |last8=Ho |first8=Beng Choon |last9=Andreasen |first9=Nancy C. |date=2012-09-01 |title=Influence of ZNF804a on Brain Structure Volumes and Symptom Severity in Individuals With Schizophrenia |url=https://doi.org/10.1001/archgenpsychiatry.2011.2116 |journal=Archives of General Psychiatry |volume=69 |issue=9 |pages=885–892 |doi=10.1001/archgenpsychiatry.2011.2116 |issn=0003-990X}}</ref> Another gene, the [[Notch 4|NOTCH4]] is thought to relate to Schizophrenia spectrum disorders.<ref>{{Cite journal |last=Wassink |first=Thomas H. |last2=Nopoulos |first2=Peggy |last3=Pietila |first3=Jennifer |last4=Crowe |first4=Raymond R. |last5=Andreasen |first5=Nancy C. |date=2003-04-01 |title=NOTCH4 and the frontal lobe in schizophrenia |url=https://onlinelibrary.wiley.com/doi/10.1002/ajmg.b.10071 |journal=American Journal of Medical Genetics |language=en |volume=118B |issue=1 |pages=1–7 |doi=10.1002/ajmg.b.10071 |issn=0148-7299 |via=[[Wiley Online Library]]}}</ref><ref>{{Cite journal |last=DiLalla |first=Lisabeth F. |last2=McCrary |first2=Megan |last3=Diaz |first3=Emma |date=2017 |title=A review of endophenotypes in schizophrenia and autism: The next phase for understanding genetic etiologies |url=https://onlinelibrary.wiley.com/doi/10.1002/ajmg.c.31566 |journal=American Journal of Medical Genetics Part C: Seminars in Medical Genetics |language=en |volume=175 |issue=3 |pages=354–361 |doi=10.1002/ajmg.c.31566 |via=[[Wiley Online Library]]}}</ref> It can lead to disruptions in the [[Occipital lobe|occipital cortex]], and therefore symptoms of schizotypy.<ref>{{Cite journal |last=Xie |first=Xiaohui |last2=Zu |first2=Meidan |last3=Zhang |first3=Long |last4=Bai |first4=Tongjian |last5=Wei |first5=Ling |last6=Huang |first6=Wanling |last7=Ji |first7=Gong-Jun |last8=Qiu |first8=Bensheng |last9=Hu |first9=Panpan |last10=Tian |first10=Yanghua |last11=Wang |first11=Kai |date=2020-07-09 |title=A common variant of the NOTCH4 gene modulates functional connectivity of the occipital cortex and its relationship with schizotypal traits |url=https://doi.org/10.1186/s12888-020-02773-z |journal=BMC Psychiatry |volume=20 |issue=1 |pages=363 |doi=10.1186/s12888-020-02773-z |issn=1471-244X |pmc=PMC7346398 |pmid=32646407}}</ref> The [[Glycine receptor, alpha 1|GLRA1]] and the [[RICS (gene)|p250GAP]] genes are also potentially associated with StPD.<ref>{{Cite journal |last=Bulbena-Cabre |first=Andrea |last2=Bassir Nia |first2=Anahita |last3=Perez-Rodriguez |first3=M. Mercedes |date=2018-08-09 |title=Current Knowledge on Gene-Environment Interactions in Personality Disorders: an Update |url=https://doi.org/10.1007/s11920-018-0934-7 |journal=Current Psychiatry Reports |language=en |volume=20 |issue=9 |pages=74 |doi=10.1007/s11920-018-0934-7 |issn=1535-1645 |via=[[SpringerLink]]}}</ref><ref>{{Cite journal |last=Köse |first=Sura Sanem |last2=Erbaş1 |first2=Oytun |last3=2 |date=2020 |title=Personality disorders diagnosis, causes, and treatments |url=https://journaltxdbu.com/abstract/43 |journal=Demiroglu Science University Florence Nightingale Journal of Transplantation |volume=5 |issue=2 |pages=022–031 |doi=10.5606/dsufnjt.2020.013 |issn=2667-6680}}</ref><ref>{{Cite journal |last=Ma |first=Guorong |last2=Fan |first2=Hongying |last3=Shen |first3=Chanchan |last4=Wang |first4=Wei |date=2016-06-01 |title=Genetic and Neuroimaging Features of Personality Disorders: State of the Art |url=https://doi.org/10.1007/s12264-016-0027-8 |journal=Neuroscience Bulletin |language=en |volume=32 |issue=3 |pages=286–306 |doi=10.1007/s12264-016-0027-8 |issn=1995-8218 |pmc=PMC5563771 |pmid=27037690}}</ref> It may lead to abnormally low levels of [[Glutamic acid|Glutamic acids]] in the [[NMDA receptor|NDMA receptors]], which impairs memory and learning.<ref>{{Cite journal |last=Vora |first=Anvi K. |last2=Fisher |first2=Amanda M. |last3=New |first3=Antonia S. |last4=Hazlett |first4=Erin A. |last5=McNamara |first5=Margaret |last6=Yuan |first6=Qiaoping |last7=Zhou |first7=Zhifeng |last8=Hodgkinson |first8=Colin |last9=Goldman |first9=David |last10=Siever |first10=Larry J. |last11=Roussos |first11=Panos |last12=Perez-Rodriguez |first12=M. Mercedes |date=2018-06-01 |title=Dimensional Traits of Schizotypy Associated With Glycine Receptor GLRA1 Polymorphism: An Exploratory Candidate-Gene Association Study |url=https://guilfordjournals.com/doi/10.1521/pedi_2017_31_303 |journal=Journal of Personality Disorders |volume=32 |issue=3 |pages=421–432 |doi=10.1521/pedi_2017_31_303 |issn=0885-579X |pmc=PMC5856645 |pmid=28758885}}</ref><ref>{{Cite journal |last=Ohi |first=Kazutaka |last2=Hashimoto |first2=Ryota |last3=Nakazawa |first3=Takanobu |last4=Okada |first4=Takeya |last5=Yasuda |first5=Yuka |last6=Yamamori |first6=Hidenaga |last7=Fukumoto |first7=Motoyuki |last8=Umeda-Yano |first8=Satomi |last9=Iwase |first9=Masao |last10=Kazui |first10=Hiroaki |last11=Yamamoto |first11=Tadashi |last12=Kano |first12=Masanobu |last13=Takeda |first13=Masatoshi |date=2012-04-18 |title=The p250GAP Gene Is Associated with Risk for Schizophrenia and Schizotypal Personality Traits |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0035696 |journal=PLOS ONE |language=en |volume=7 |issue=4 |pages=e35696 |doi=10.1371/journal.pone.0035696 |issn=1932-6203 |pmc=PMC3329470 |pmid=22530067}}</ref><ref>{{Cite journal |last=Walter |first=Emma E. |last2=Fernandez |first2=Francesca |last3=Snelling |first3=Mollie |last4=Barkus |first4=Emma |date=2016 |title=Genetic Consideration of Schizotypal Traits: A Review |url=https://www.frontiersin.org/articles/10.3389/fpsyg.2016.01769 |journal=Frontiers in Psychology |volume=7 |doi=10.3389/fpsyg.2016.01769/full |issn=1664-1078}}</ref><ref>{{Cite journal |last=Lett |first=Tristram A. |last2=Voineskos |first2=Aristotle N. |last3=Kennedy |first3=James L. |last4=Levine |first4=Brian |last5=Daskalakis |first5=Zafiris J. |date=2014-03-01 |title=Treating Working Memory Deficits in Schizophrenia: A Review of the Neurobiology |url=https://www.biologicalpsychiatryjournal.com/article/S0006-3223(13)00681-1/abstract |journal=Biological Psychiatry |language=English |volume=75 |issue=5 |pages=361–370 |doi=10.1016/j.biopsych.2013.07.026 |issn=0006-3223 |pmid=24011822 |via=[[Elsevier Science Direct]]}}</ref> StPD may stem from abnormalities in [[Chromosome 22]].<ref>{{Cite journal |last=Esterberg |first=Michelle L. |last2=Trotman |first2=Hanan D. |last3=Brasfield |first3=Joy L. |last4=Compton |first4=Michael T. |last5=Walker |first5=Elaine F. |date=2008-09-01 |title=Childhood and current autistic features in adolescents with schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996408002168 |journal=Schizophrenia Research |language=en |volume=104 |issue=1 |pages=265–273 |doi=10.1016/j.schres.2008.04.029 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Shapiro |first=D. I. |last2=Cubells |first2=J. F. |last3=Ousley |first3=O. Y. |last4=Rockers |first4=K. |last5=Walker |first5=E. F. |date=2011-06-01 |title=Prodromal symptoms in adolescents with 22q11.2 deletion syndrome and schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996411001782 |journal=Schizophrenia Research |language=en |volume=129 |issue=1 |pages=20–28 |doi=10.1016/j.schres.2011.03.030 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Esposito |first=Cecilia Maria |last2=Enrico |first2=Paolo |last3=Sciortino |first3=Domenico |last4=Caletti |first4=Elisabetta |last5=Marchetti |first5=Giulia Bruna |last6=Cesaretti |first6=Claudia |last7=Oldani |first7=Lucio |last8=Fiorentini |first8=Alessio |last9=Brambilla |first9=Paolo |date=2021 |title=Case Report: The Association Between Chromosomal Anomalies and Cluster A Personality Disorders: The Case of Two Siblings With 16p11.2 Deletion and a Review of the Literature |url=https://www.frontiersin.org/articles/10.3389/fpsyt.2021.689359 |journal=Frontiers in Psychiatry |volume=12 |doi=10.3389/fpsyt.2021.689359/full |issn=1664-0640}}</ref>


=== Neurological ===
==Causes==
Exposure to influenza during week 23 of [[gestation]] is associated with a higher likelihood of developing StPD. Poor [[nutrition]] in childhood may also contribute to the onset of StPD by altering the course of brain development.<ref>{{Cite journal |last=Venables |first=Peter H. |last2=Raine |first2=Adrian |date=2012-08-01 |title=Poor Nutrition at Age 3 and Schizotypal Personality at Age 23: The Mediating Role of Age 11 Cognitive Functioning |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.2012.11081173 |journal=American Journal of Psychiatry |volume=169 |issue=8 |pages=822–830 |doi=10.1176/appi.ajp.2012.11081173 |issn=0002-953X}}</ref> Numerous areas of the brain are thought to be associated with StPD. Higher levels of dopamine in the brain,<ref>{{Cite journal |last=Howes |first=Oliver D. |last2=Bose |first2=Subrata K. |last3=Turkheimer |first3=Federico |last4=Valli |first4=Isabel |last5=Egerton |first5=Alice |last6=Valmaggia |first6=Lucia R. |last7=Murray |first7=Robin M. |last8=McGuire |first8=Philip |date=2011-12-01 |title=Dopamine Synthesis Capacity Before Onset of Psychosis: A Prospective [18F]-DOPA PET Imaging Study |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.2011.11010160 |journal=American Journal of Psychiatry |volume=168 |issue=12 |pages=1311–1317 |doi=10.1176/appi.ajp.2011.11010160 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Woodward |first=Neil D. |last2=Cowan |first2=Ronald L. |last3=Park |first3=Sohee |last4=Ansari |first4=M. Sib |last5=Baldwin |first5=Ronald M. |last6=Li |first6=Rui |last7=Doop |first7=Mikisha |last8=Kessler |first8=Robert M. |last9=Zald |first9=David H. |date=2011-04-01 |title=Correlation of Individual Differences in Schizotypal Personality Traits With Amphetamine-Induced Dopamine Release in Striatal and Extrastriatal Brain Regions |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.2010.10020165 |journal=American Journal of Psychiatry |volume=168 |issue=4 |pages=418–426 |doi=10.1176/appi.ajp.2010.10020165 |issn=0002-953X |pmc=PMC3770457 |pmid=21159728}}</ref> possibly specifically the [[Dopamine receptor D1|D1 receptor]],<ref>{{Cite journal |last=Pekcec |first=Anton |last2=Schülert |first2=Niklas |last3=Stierstorfer |first3=Birgit |last4=Deiana |first4=Serena |last5=Dorner‐Ciossek |first5=Cornelia |last6=Rosenbrock |first6=Holger |date=2018 |title=Targeting the dopamine D 1 receptor or its downstream signalling by inhibiting phosphodiesterase‐1 improves cognitive performance |url=https://onlinelibrary.wiley.com/doi/10.1111/bph.14350 |journal=British Journal of Pharmacology |language=en |volume=175 |issue=14 |pages=3021–3033 |doi=10.1111/bph.14350 |issn=0007-1188 |pmc=PMC6016630 |pmid=29726015 |via=[[Wiley Online Library]]}}</ref><ref>{{Cite journal |last=Chemerinski |first=Eran |last2=Siever |first2=Larry J. |last3=Koenigsberg |first3=Harold W. |date=2005-12-01 |title=Dopamine regulation in schizotypal personality disorder and psychosis |url=https://doi.org/10.1007/BF02629449 |journal=Current Psychosis & Therapeutics Reports |language=en |volume=3 |issue=4 |pages=162–168 |doi=10.1007/BF02629449 |issn=1545-8091 |via=[[SpringerLink]]}}</ref><ref>{{Cite journal |last=Goldman-Rakic |first=Patricia S. |last2=Castner |first2=Stacy A. |last3=Svensson |first3=Torgny H. |last4=Siever |first4=Larry J. |last5=Williams |first5=Graham V. |date=2004-06-01 |title=Targeting the dopamine D1 receptor in schizophrenia: insights for cognitive dysfunction |url=https://doi.org/10.1007/s00213-004-1793-y |journal=Psychopharmacology |language=en |volume=174 |issue=1 |pages=3–16 |doi=10.1007/s00213-004-1793-y |issn=1432-2072 |via=[[SpringerLink]]}}</ref> might contribute to the development of StPD. StPD is associated with heightened dopaminergic activity in the [[striatum]].<ref>{{Cite journal |last=Kirschner |first=Matthias |last2=Hager |first2=Oliver M. |last3=Muff |first3=Larissa |last4=Bischof |first4=Martin |last5=Hartmann-Riemer |first5=Matthias N. |last6=Kluge |first6=Agne |last7=Habermeyer |first7=Benedikt |last8=Seifritz |first8=Erich |last9=Tobler |first9=Philippe N. |last10=Kaiser |first10=Stefan |date=2018-01-13 |title=Ventral Striatal Dysfunction and Symptom Expression in Individuals With Schizotypal Personality Traits and Early Psychosis |url=https://pubmed.ncbi.nlm.nih.gov/27798223/ |journal=Schizophrenia Bulletin |volume=44 |issue=1 |pages=147–157 |doi=10.1093/schbul/sbw142 |issn=1745-1701 |pmc=5767950 |pmid=27798223 |via=[[PubMed]]}}</ref><ref>{{Cite journal |last=Waltmann |first=Maria |last2=O'Daly |first2=Owen |last3=Egerton |first3=Alice |last4=McMullen |first4=Katrina |last5=Kumari |first5=Veena |last6=Barker |first6=Gareth J. |last7=Williams |first7=Steve C. R. |last8=Modinos |first8=Gemma |date=2019-01-01 |title=Multi-echo fMRI, resting-state connectivity, and high psychometric schizotypy |url=https://www.sciencedirect.com/science/article/pii/S2213158218303516 |journal=NeuroImage: Clinical |language=en |volume=21 |pages=101603 |doi=10.1016/j.nicl.2018.11.013 |issn=2213-1582}}</ref><ref>{{Cite journal |last=Siever |first=Larry J. |last2=Davis |first2=Kenneth L. |date=2004-03-01 |title=The Pathophysiology of Schizophrenia Disorders: Perspectives From the Spectrum |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.161.3.398?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed |journal=American Journal of Psychiatry |language=en |doi=10.1176/appi.ajp.161.3.398?url_ver=z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed}}</ref><ref>{{Cite journal |last=Rössler |first=Julian |last2=Unterassner |first2=Lui |last3=Wyss |first3=Thomas |last4=Haker |first4=Helene |last5=Brugger |first5=Peter |last6=Rössler |first6=Wulf |last7=Wotruba |first7=Diana |date=2019-04-25 |title=Schizotypal Traits are Linked to Dopamine-Induced Striato-Cortical Decoupling: A Randomized Double-Blind Placebo-Controlled Study |url=https://pubmed.ncbi.nlm.nih.gov/29878280/ |journal=Schizophrenia Bulletin |volume=45 |issue=3 |pages=680–688 |doi=10.1093/schbul/sby079 |issn=1745-1701 |pmc=6483584 |pmid=29878280}}</ref> Their symptoms may also stem from higher [[Synapse|presynaptic]] dopamine release.<ref>{{Cite journal |last=Miyake |first=Nobumi |last2=Thompson |first2=Judy |last3=Skinbjerg |first3=Mette |last4=Abi-Dargham |first4=Anissa |date=2011 |title=Presynaptic Dopamine in Schizophrenia: Presynaptic Dopamine in Schizophrenia |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1755-5949.2010.00230.x |journal=CNS Neuroscience & Therapeutics |language=en |volume=17 |issue=2 |pages=104–109 |doi=10.1111/j.1755-5949.2010.00230.x |pmc=PMC6493810 |pmid=21199451 |via=[[Wiley Online Library]]}}</ref><ref>{{Cite journal |last=Fervaha |first=Gagan |last2=Remington |first2=Gary |date=2013-06-03 |title=Neuroimaging findings in schizotypal personality disorder: A systematic review |url=https://www.sciencedirect.com/science/article/pii/S0278584612002965 |journal=Progress in Neuro-Psychopharmacology and Biological Psychiatry |language=en |volume=43 |pages=96–107 |doi=10.1016/j.pnpbp.2012.11.014 |issn=0278-5846 |via=[[Elsevier Science Direct]]}}</ref><ref>{{Cite journal |last=Howes |first=Oliver D. |last2=Bose |first2=Subrata K. |last3=Turkheimer |first3=Federico |last4=Valli |first4=Isabel |last5=Egerton |first5=Alice |last6=Valmaggia |first6=Lucia R. |last7=Murray |first7=Robin M. |last8=McGuire |first8=Philip |date=2011-12-01 |title=Dopamine Synthesis Capacity Before Onset of Psychosis: A Prospective [18F]-DOPA PET Imaging Study |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.2011.11010160 |journal=American Journal of Psychiatry |volume=168 |issue=12 |pages=1311–1317 |doi=10.1176/appi.ajp.2011.11010160 |issn=0002-953X |pmc=PMC3682447 |pmid=21768612}}</ref><ref>{{Cite journal |last=Egerton |first=Alice |last2=Chaddock |first2=Christopher A. |last3=Winton-Brown |first3=Toby T. |last4=Bloomfield |first4=Michael A. P. |last5=Bhattacharyya |first5=Sagnik |last6=Allen |first6=Paul |last7=McGuire |first7=Philip K. |last8=Howes |first8=Oliver D. |date=2013-07-15 |title=Presynaptic Striatal Dopamine Dysfunction in People at Ultra-high Risk for Psychosis: Findings in a Second Cohort |url=https://www.sciencedirect.com/science/article/pii/S0006322312010050 |journal=Biological Psychiatry |series=Corticostriatal Networks, Psychopathology, and Treatment |language=en |volume=74 |issue=2 |pages=106–112 |doi=10.1016/j.biopsych.2012.11.017 |issn=0006-3223}}</ref> People with StPD may also have decreased volumes of [[Grey matter|grey]] or [[white matter]] in their [[caudate nucleus]].<ref>{{Cite journal |last=Levitt |first=James J. |last2=Westin |first2=Carl-Fredrik |last3=Nestor |first3=Paul G. |last4=Estepar |first4=Raul S. J. |last5=Dickey |first5=Chandlee C. |last6=Voglmaier |first6=Martina M. |last7=Seidman |first7=Larry J. |last8=Kikinis |first8=Ron |last9=Jolesz |first9=Ferenc A. |last10=McCarley |first10=Robert W. |last11=Shenton |first11=Martha E. |date=2004-01-15 |title=Shape of caudate nucleus and its cognitive correlates in neuroleptic-naive schizotypal personality disorder |url=https://www.biologicalpsychiatryjournal.com/article/S0006-3223(03)00871-0/abstract |journal=Biological Psychiatry |language=English |volume=55 |issue=2 |pages=177–184 |doi=10.1016/j.biopsych.2003.08.005 |issn=0006-3223}}</ref><ref>{{Cite journal |last=Haidar |first=H. |last2=Bouix |first2=S. |last3=Levitt |first3=J.J. |last4=McCarley |first4=R.W. |last5=Shenton |first5=M.E. |last6=Soul |first6=J.S. |date=2006 |title=Characterizing the shape of anatomical structures with Poisson's equation |url=https://ieeexplore.ieee.org/document/1704884 |journal=IEEE Transactions on Medical Imaging |volume=25 |issue=10 |pages=1249–1257 |doi=10.1109/TMI.2006.881378 |issn=1558-254X}}</ref> Which leads to difficulties in speech.<ref>{{Cite journal |last=Niethammer |first=Marc |last2=Reuter |first2=Martin |last3=Wolter |first3=Franz-Erich |last4=Bouix |first4=Sylvain |last5=Peinecke |first5=Niklas |last6=Koo |first6=Min-Seong |last7=Shenton |first7=Martha E. |date=2007 |title=Global medical shape analysis using the Laplace-Beltrami spectrum |url=https://pubmed.ncbi.nlm.nih.gov/18051138/ |journal=Medical image computing and computer-assisted intervention: MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention |volume=10 |issue=Pt 1 |pages=850–857 |doi=10.1007/978-3-540-75757-3_103 |pmc=2782516 |pmid=18051138}}</ref><ref>{{Cite journal |last=Koo |first=Min-Seong |last2=Levitt |first2=James J. |last3=McCarley |first3=Robert W. |last4=Seidman |first4=Larry J. |last5=Dickey |first5=Chandlee C. |last6=Niznikiewicz |first6=Margaret A. |last7=Voglmaier |first7=Martina M. |last8=Zamani |first8=Payman |last9=Long |first9=Katherine R. |last10=Kim |first10=Sunnie S. |last11=Shenton |first11=Martha E. |date=2006-07-01 |title=Reduction of Caudate Nucleus Volumes in Neuroleptic-Naïve Female Subjects with Schizotypal Personality Disorder |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2768064/ |journal=Biological psychiatry |volume=60 |issue=1 |pages=40–48 |doi=10.1016/j.biopsych.2005.09.028 |issn=0006-3223 |pmc=2768064 |pmid=16460694}}</ref><ref>{{Cite journal |last=Levitt |first=James J. |last2=Styner |first2=Martin |last3=Niethammer |first3=Marc |last4=Bouix |first4=Sylvain |last5=Koo |first5=Min-Seong |last6=Voglmaier |first6=Martina M. |last7=Dickey |first7=Chandlee C. |last8=Niznikiewicz |first8=Margaret A. |last9=Kikinis |first9=Ron |last10=McCarley |first10=Robert, W. |last11=Shenton |first11=Martha E. |date=2009-05-01 |title=Shape abnormalities of caudate nucleus in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996408005094 |journal=Schizophrenia Research |language=en |volume=110 |issue=1 |pages=127–139 |doi=10.1016/j.schres.2008.11.012 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Levitt |first=James J. |last2=McCarley |first2=Robert W. |last3=Dickey |first3=Chandlee C. |last4=Voglmaier |first4=Martina M. |last5=Niznikiewicz |first5=Margaret A. |last6=Seidman |first6=Larry J. |last7=Hirayasu |first7=Yoshio |last8=Ciszewski |first8=Aleksandra A. |last9=Kikinis |first9=Ron |last10=Jolesz |first10=Ferenc A. |last11=Shenton |first11=Martha E. |date=2002-07-01 |title=MRI Study of Caudate Nucleus Volume and Its Cognitive Correlates in Neuroleptic-Naive Patients With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.159.7.1190 |journal=American Journal of Psychiatry |volume=159 |issue=7 |pages=1190–1197 |doi=10.1176/appi.ajp.159.7.1190 |issn=0002-953X}}</ref> People with StPD likely have a reduced volume in their temporal lobes,<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=Seidman |first5=Larry J. |last6=Hirayasu |first6=Yoshio |last7=Fischer |first7=Iris |last8=Teh |first8=Eng Kaet |last9=Rhoads |first9=Richard Van |last10=Jakab |first10=Marianna |last11=Kikinis |first11=Ron |last12=Jolesz |first12=Ferenc A. |last13=Shenton |first13=Martha E. |date=1999-06-01 |title=Schizotypal personality disorder and MRI abnormalities of temporal lobe gray matter |url=https://www.biologicalpsychiatryjournal.com/article/S0006-3223(99)00030-X/abstract |journal=Biological Psychiatry |language=English |volume=45 |issue=11 |pages=1393–1402 |doi=10.1016/S0006-3223(99)00030-X |issn=0006-3223}}</ref><ref>{{Cite journal |last=Zhu |first=Yikang |last2=Tang |first2=Yunxiang |last3=Zhang |first3=Tianhong |last4=Li |first4=Hui |last5=Tang |first5=Yingying |last6=Li |first6=Chunbo |last7=Luo |first7=Xingguang |last8=He |first8=Yongguang |last9=Lu |first9=Zheng |last10=Wang |first10=Jijun |date=2017-02-02 |title=Reduced functional connectivity between bilateral precuneus and contralateral parahippocampus in schizotypal personality disorder |url=https://doi.org/10.1186/s12888-016-1146-5 |journal=BMC Psychiatry |volume=17 |issue=1 |pages=48 |doi=10.1186/s12888-016-1146-5 |issn=1471-244X |pmc=PMC5288938 |pmid=28152990}}</ref><ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=Shenton |first2=Martha E. |last3=Hirayasu |first3=Yoshio |last4=Fischer |first4=Iris |last5=Voglmaier |first5=Martina M. |last6=Niznikiewicz |first6=Margaret A. |last7=Seidman |first7=Larry J. |last8=Fraone |first8=Stephanie |last9=McCarley |first9=Robert W. |date=2000-01-01 |title=Large CSF Volume Not Attributable to Ventricular Volume in Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.157.1.48 |journal=American Journal of Psychiatry |volume=157 |issue=1 |pages=48–54 |doi=10.1176/ajp.157.1.48 |issn=0002-953X}}</ref> possibly specifically the left hemisphere. The reduced levels of [[Grey matter|gray matter]] in these areas may be linked to their negative symptoms.<ref>{{Cite journal |last=Asami |first=Takeshi |last2=Whitford |first2=Thomas J. |last3=Bouix |first3=Sylvain |last4=Dickey |first4=Chandlee C. |last5=Niznikiewicz |first5=Margaret |last6=Shenton |first6=Martha E. |last7=Voglmaier |first7=Martina M. |last8=McCarley |first8=Robert W. |date=2013-04-01 |title=Globally and Locally Reduced MRI Gray Matter Volumes in Neuroleptic-Naive Men With Schizotypal Personality Disorder: Association With Negative Symptoms |url=https://doi.org/10.1001/jamapsychiatry.2013.665 |journal=JAMA Psychiatry |volume=70 |issue=4 |pages=361–372 |doi=10.1001/jamapsychiatry.2013.665 |issn=2168-622X}}</ref> Reduced volume of gray or [[white matter]] in the [[superior temporal gyrus]] or the [[transverse temporal gyrus]] are thought to lead to issues with speech,<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=Seidman |first5=Larry J. |last6=Demeo |first6=Susan |last7=Frumin |first7=Melissa |last8=Shenton |first8=Martha E. |date=2003-12-01 |title=An MRI Study of Superior Temporal Gyrus Volume in Women With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.160.12.2198 |journal=American Journal of Psychiatry |volume=160 |issue=12 |pages=2198–2201 |doi=10.1176/appi.ajp.160.12.2198 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Voglmaier |first3=Martina M. |last4=Frumin |first4=Melissa |last5=Niznikiewicz |first5=Margaret A. |last6=Hirayasu |first6=Yoshio |last7=Fraone |first7=Stephanie |last8=Seidman |first8=Larry J. |last9=Shenton |first9=Martha E. |date=2002-09-01 |title=Smaller Left Heschl’s Gyrus Volume in Patients With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.159.9.1521 |journal=American Journal of Psychiatry |volume=159 |issue=9 |pages=1521–1527 |doi=10.1176/appi.ajp.159.9.1521 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=Seidman |first5=Larry J. |last6=Frumin |first6=Melissa |last7=Toner |first7=Sarah |last8=Demeo |first8=Susan |last9=Shenton |first9=Martha E. |date=2003-11-01 |title=A MRI study of fusiform gyrus in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996402005297 |journal=Schizophrenia Research |language=en |volume=64 |issue=1 |pages=35–39 |doi=10.1016/S0920-9964(02)00529-7 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Lener |first=Marc S. |last2=Wong |first2=Edmund |last3=Tang |first3=Cheuk Y. |last4=Byne |first4=William |last5=Goldstein |first5=Kim E. |last6=Blair |first6=Nicholas J. |last7=Haznedar |first7=M. Mehmet |last8=New |first8=Antonia S. |last9=Chemerinski |first9=Eran |last10=Chu |first10=King-Wai |last11=Rimsky |first11=Liza S. |last12=Siever |first12=Larry J. |last13=Koenigsberg |first13=Harold W. |last14=Hazlett |first14=Erin A. |date=2015 |title=White matter abnormalities in schizophrenia and schizotypal personality disorder |url=https://pubmed.ncbi.nlm.nih.gov/24962608/ |journal=Schizophrenia Bulletin |volume=41 |issue=1 |pages=300–310 |doi=10.1093/schbul/sbu093 |issn=1745-1701 |pmc=4266294 |pmid=24962608 |via=[[Elsevier Science Direct]]}}</ref> memory, and [[Hallucination|hallucinations]].<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Shenton |first3=Martha E. |date=2002 |title=The brain in schizotypal personality disorder: a review of structural MRI and CT findings |url=https://pubmed.ncbi.nlm.nih.gov/11751641/ |journal=Harvard Review of Psychiatry |volume=10 |issue=1 |pages=1–15 |doi=10.1080/10673220216201 |issn=1067-3229 |pmc=2854016 |pmid=11751641}}</ref><ref>{{Cite journal |last=Goldstein |first=Kim E. |last2=Hazlett |first2=Erin A. |last3=New |first3=Antonia S. |last4=Haznedar |first4=M. Mehmet |last5=Newmark |first5=Randall E. |last6=Zelmanova |first6=Yuliya |last7=Passarelli |first7=Vincent |last8=Weinstein |first8=Shauna R. |last9=Canfield |first9=Emily L. |last10=Meyerson |first10=David A. |last11=Tang |first11=Cheuk Y. |last12=Buchsbaum |first12=Monte S. |last13=Siever |first13=Larry J. |date=2009-07-01 |title=Smaller superior temporal gyrus volume specificity in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996409002102 |journal=Schizophrenia Research |language=en |volume=112 |issue=1 |pages=14–23 |doi=10.1016/j.schres.2009.04.027 |issn=0920-9964}}</ref> Deficits in the gray matter volume of the temporal lobe and [[prefrontal cortex]] are likely associated with impairments in [[Cognitive skill|cognitive function]], [[sensory processing]], [[speech]], [[Executive functions|executive function]], [[decision-making]], and [[Emotion|emotional processing]] present in people with StPD.<ref>{{Cite journal |last=Takayanagi |first=Yoichiro |last2=Sasabayashi |first2=Daiki |last3=Takahashi |first3=Tsutomu |last4=Furuichi |first4=Atsushi |last5=Kido |first5=Mikio |last6=Nishikawa |first6=Yumiko |last7=Nakamura |first7=Mihoko |last8=Noguchi |first8=Kyo |last9=Suzuki |first9=Michio |date=2020-02-26 |title=Reduced Cortical Thickness in Schizophrenia and Schizotypal Disorder |url=https://pubmed.ncbi.nlm.nih.gov/31167030/ |journal=Schizophrenia Bulletin |volume=46 |issue=2 |pages=387–394 |doi=10.1093/schbul/sbz051 |issn=1745-1701 |pmc=7406196 |pmid=31167030}}</ref><ref>{{Cite journal |last=Perez-Rodriguez |first=M. Mercedes |last2=Zaluda |first2=Lauren |last3=New |first3=Antonia S. |date=2013-04-01 |title=Biological Advances in Personality Disorders |url=https://focus.psychiatryonline.org/doi/10.1176/appi.focus.11.2.146 |journal=FOCUS |volume=11 |issue=2 |pages=146–154 |doi=10.1176/appi.focus.11.2.146 |issn=1541-4094}}</ref> StPD symptoms may also be influenced by reduced [[internal capsule]],<ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Collazo |first2=Tyson |last3=Zelmanova |first3=Yuliya |last4=Entis |first4=Jonathan J. |last5=Chu |first5=King-Wai |last6=Goldstein |first6=Kim E. |last7=Roussos |first7=Panos |last8=Haznedar |first8=M. Mehmet |last9=Koenigsberg |first9=Harold W. |last10=New |first10=Antonia S. |last11=Buchsbaum |first11=Monte S. |last12=Hershowitz |first12=Julian P. |last13=Siever |first13=Larry J. |last14=Byne |first14=William |date=2012-11-01 |title=Anterior limb of the internal capsule in schizotypal personality disorder: Fiber-tract counting, volume, and anisotropy |url=https://www.sciencedirect.com/science/article/pii/S0920996412005051 |journal=Schizophrenia Research |language=en |volume=141 |issue=2 |pages=119–127 |doi=10.1016/j.schres.2012.08.022 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Suzuki |first=Michio |last2=Zhou |first2=Shi-Yu |last3=Hagino |first3=Hirofumi |last4=Takahashi |first4=Tsutomu |last5=Kawasaki |first5=Yasuhiro |last6=Nohara |first6=Shigeru |last7=Yamashita |first7=Ikiko |last8=Matsui |first8=Mie |last9=Seto |first9=Hikaru |last10=Kurachi |first10=Masayoshi |date=2004-04-30 |title=Volume reduction of the right anterior limb of the internal capsule in patients with schizotypal disorder |url=https://www.sciencedirect.com/science/article/pii/S0925492704000022 |journal=Psychiatry Research: Neuroimaging |language=en |volume=130 |issue=3 |pages=213–225 |doi=10.1016/j.pscychresns.2004.01.001 |issn=0925-4927}}</ref><ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Goldstein |first2=Kim E. |last3=Kolaitis |first3=Jeanine C. |date=2012-02-01 |title=A Review of Structural MRI and Diffusion Tensor Imaging in Schizotypal Personality Disorder |url=https://doi.org/10.1007/s11920-011-0241-z |journal=Current Psychiatry Reports |language=en |volume=14 |issue=1 |pages=70–78 |doi=10.1007/s11920-011-0241-z |issn=1535-1645 |pmc=PMC3256320 |pmid=22006127}}</ref> which carries information to the [[cerebral cortex]].<ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Goldstein |first2=Kim E. |last3=Tajima-Pozo |first3=Kazuhiro |last4=Speidel |first4=Elizabeth R. |last5=Zelmanova |first5=Yuliya |last6=Entis |first6=Jonathan J. |last7=Silverman |first7=Jeremy M. |last8=New |first8=Antonia S. |last9=Koenigsberg |first9=Harold W. |last10=Haznedar |first10=M. Mehmet |last11=Byne |first11=William |last12=Siever |first12=Larry J. |date=2011-04-01 |title=Cingulate and temporal lobe fractional anisotropy in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S1053811911000061 |journal=NeuroImage |language=en |volume=55 |issue=3 |pages=900–908 |doi=10.1016/j.neuroimage.2010.12.082 |issn=1053-8119}}</ref> People with StPD can also have impairments in the [[uncinate fasciculus]], which connects parts of the [[limbic system]].<ref>{{Cite journal |last=Gurrera |first=Ronald J. |last2=Nakamura |first2=Motoaki |last3=Kubicki |first3=Marek |last4=Dickey |first4=Chandlee C. |last5=Niznikiewicz |first5=Margaret A. |last6=Voglmaier |first6=Martina M. |last7=Seidman |first7=Larry J. |last8=Westin |first8=Carl-Fredrik |last9=Maier |first9=Stephan E. |last10=McCarley |first10=Robert W. |last11=Shenton |first11=Martha E. |date=2007-02-01 |title=The uncinate fasciculus and extraversion in schizotypal personality disorder: A diffusion tensor imaging study |url=https://www.sciencedirect.com/science/article/pii/S0920996406004397 |journal=Schizophrenia Research |language=en |volume=90 |issue=1 |pages=360–362 |doi=10.1016/j.schres.2006.10.003 |issn=0920-9964}}</ref>People with StPD have reduced levels of gray matter in their [[middle frontal gyrus]] and [[Brodmann area 10]].<ref name=":4">{{Cite journal |last=Lagioia |first=AnnaLaura |last2=Eliez |first2=Stephan |last3=Schneider |first3=Maude |last4=Simons |first4=Jon S. |last5=Van der Linden |first5=Martial |last6=Debbané |first6=Martin |date=2011-04-01 |title=Neural correlates of reality monitoring during adolescence |url=https://www.sciencedirect.com/science/article/pii/S1053811910016599 |journal=NeuroImage |language=en |volume=55 |issue=3 |pages=1393–1400 |doi=10.1016/j.neuroimage.2010.12.058 |issn=1053-8119}}</ref> Although, not as reduced as patients with Schizophrenia.<ref name=":4" /> Possibly preventing them from developing schizophrenia.<ref>{{Cite journal |last=Liu |first=Kai |last2=Zhang |first2=Teng |last3=Zhang |first3=Qing |last4=Sun |first4=Yueji |last5=Wu |first5=Jianlin |last6=Lei |first6=Yi |last7=Chu |first7=Winnie C. W. |last8=Mok |first8=Vincent C. T. |last9=Wang |first9=Defeng |last10=Shi |first10=Lin |date=2016 |title=Characterization of the Fiber Connectivity Profile of the Cerebral Cortex in Schizotypal Personality Disorder: A Pilot Study |url=https://www.frontiersin.org/articles/10.3389/fpsyg.2016.00809 |journal=Frontiers in Psychology |volume=7 |doi=10.3389/fpsyg.2016.00809/full |issn=1664-1078}}</ref> Increased gyrification in gyri by the cerebellum may lead to dysconnectivity in the brain, and therefore, schizotypal symptoms.<ref>{{Cite journal |last=Sasabayashi |first=Daiki |last2=Takayanagi |first2=Yoichiro |last3=Takahashi |first3=Tsutomu |last4=Nemoto |first4=Kiyotaka |last5=Furuichi |first5=Atsushi |last6=Kido |first6=Mikio |last7=Nishikawa |first7=Yumiko |last8=Nakamura |first8=Mihoko |last9=Noguchi |first9=Kyo |last10=Suzuki |first10=Michio |date=2020 |title=Increased brain gyrification in the schizophrenia spectrum |url=https://onlinelibrary.wiley.com/doi/10.1111/pcn.12939 |journal=Psychiatry and Clinical Neurosciences |language=en |volume=74 |issue=1 |pages=70–76 |doi=10.1111/pcn.12939 |issn=1323-1316}}</ref><ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Buchsbaum |first2=Monte S. |last3=Haznedar |first3=M. Mehmet |last4=Newmark |first4=Randall |last5=Goldstein |first5=Kim E. |last6=Zelmanova |first6=Yuliya |last7=Glanton |first7=Cathryn F. |last8=Torosjan |first8=Yuliya |last9=New |first9=Antonia S. |last10=Lo |first10=Jennifer N. |last11=Mitropoulou |first11=Vivian |last12=Siever |first12=Larry J. |date=2008-04-01 |title=Cortical gray and white matter volume in unmedicated schizotypal and schizophrenia patients |url=https://www.sciencedirect.com/science/article/pii/S0920996407010419 |journal=Schizophrenia Research |language=en |volume=101 |issue=1 |pages=111–123 |doi=10.1016/j.schres.2007.12.472 |issn=0920-9964}}</ref> They may also have a hyporeactive,<ref>{{Cite journal |last=Perez-Rodriguez |first=M. Mercedes |last2=New |first2=Antonia S. |last3=Goldstein |first3=Kim E. |last4=Rosell |first4=Daniel |last5=Yuan |first5=Qiaoping |last6=Zhou |first6=Zhifeng |last7=Hodgkinson |first7=Colin |last8=Goldman |first8=David |last9=Siever |first9=Larry J. |last10=Hazlett |first10=Erin A. |date=2017-05-30 |title=Brain-derived neurotrophic factor Val66Met genotype modulates amygdala habituation |url=https://www.sciencedirect.com/science/article/pii/S0925492716302268 |journal=Psychiatry Research: Neuroimaging |language=en |volume=263 |pages=85–92 |doi=10.1016/j.pscychresns.2017.03.008 |issn=0925-4927}}</ref> or hyperreactive [[amygdala]].<ref>{{Cite journal |last=Stanfield |first=Andrew C. |last2=Philip |first2=Ruth C. M. |last3=Whalley |first3=Heather |last4=Romaniuk |first4=Liana |last5=Hall |first5=Jeremy |last6=Johnstone |first6=Eve C. |last7=Lawrie |first7=Stephen M. |date=2017-10-21 |title=Dissociation of Brain Activation in Autism and Schizotypal Personality Disorder During Social Judgments |url=https://pubmed.ncbi.nlm.nih.gov/29088456/ |journal=Schizophrenia Bulletin |volume=43 |issue=6 |pages=1220–1228 |doi=10.1093/schbul/sbx083 |issn=1745-1701 |pmc=5737648 |pmid=29088456}}</ref> As well as hyperactive [[pituitary gland]]<nowiki/>s and [[putamen|putamens]].<ref>{{Cite journal |last=Chemerinski |first=Eran |last2=Byne |first2=William |last3=Kolaitis |first3=Jeanine C. |last4=Glanton |first4=Cathryn F. |last5=Canfield |first5=Emily L. |last6=Newmark |first6=Randall E. |last7=Haznedar |first7=M. Mehmet |last8=Novakovic |first8=Vladan |last9=Chu |first9=King-Wai |last10=Siever |first10=Larry J. |last11=Hazlett |first11=Erin A. |date=2013-01-01 |title=Larger putamen size in antipsychotic-naïve individuals with schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996412006172 |journal=Schizophrenia Research |language=en |volume=143 |issue=1 |pages=158–164 |doi=10.1016/j.schres.2012.11.003 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Romo-Nava |first=F. |last2=Hoogenboom |first2=W. S. |last3=Pelavin |first3=P. E. |last4=Alvarado |first4=J. L. |last5=Bobrow |first5=L. H. |last6=MacMaster |first6=F. P. |last7=Keshavan |first7=M. |last8=McCarley |first8=R. W. |last9=Shenton |first9=M. E. |date=2013-05-01 |title=Pituitary volume in schizophrenia spectrum disorders |url=https://www.sciencedirect.com/science/article/pii/S0920996413001163 |journal=Schizophrenia Research |language=en |volume=146 |issue=1 |pages=301–307 |doi=10.1016/j.schres.2013.02.024 |issn=0920-9964}}</ref> It is also possible that lower capacities for [[prepulse inhibition]] plays a role in StPD.<ref>{{Cite journal |last=Cadenhead |first=Kristin S. |last2=Light |first2=Gregory A. |last3=Geyer |first3=Mark A. |last4=McDowell |first4=Jennifer E. |last5=Braff |first5=David L. |date=2002-05-01 |title=Neurobiological Measures of Schizotypal Personality Disorder: Defining an Inhibitory Endophenotype? |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.159.5.869 |journal=American Journal of Psychiatry |volume=159 |issue=5 |pages=869–871 |doi=10.1176/appi.ajp.159.5.869 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Levine |first2=Jill |last3=Buchsbaum |first3=Monte S. |last4=Silverman |first4=Jeremy M. |last5=New |first5=Antonia |last6=Sevin |first6=Elizabeth M. |last7=Maldari |first7=Liza A. |last8=Siever |first8=Larry J. |date=2003-09-01 |title=Deficient Attentional Modulation of the Startle Response in Patients With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.160.9.1621 |journal=American Journal of Psychiatry |volume=160 |issue=9 |pages=1621–1626 |doi=10.1176/appi.ajp.160.9.1621 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Cadenhead |first=Kristin S. |last2=Swerdlow |first2=Neal R. |last3=Shafer |first3=Kathleen M. |last4=Diaz |first4=Martha |last5=Braff |first5=David L. |date=2000-10-01 |title=Modulation of the Startle Response and Startle Laterality in Relatives of Schizophrenic Patients and in Subjects With Schizotypal Personality Disorder: Evidence of Inhibitory Deficits |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.157.10.1660 |journal=American Journal of Psychiatry |volume=157 |issue=10 |pages=1660–1668 |doi=10.1176/appi.ajp.157.10.1660 |issn=0002-953X}}</ref><ref>{{Cite journal |date=1993-12-01 |title=Impaired startle prepulse inhibition and habituation in patients with schizotypal personality disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.150.12.1862 |journal=American Journal of Psychiatry |volume=150 |issue=12 |pages=1862–1867 |doi=10.1176/ajp.150.12.1862 |issn=0002-953X}}</ref> Research has suggested that people with StPD can have higher concentrations of [[Homovanillic acid|Homovanillic acids]].<ref>{{Cite journal |date=1993-01-01 |title=CSF homovanillic acid in schizotypal personality disorder |url=https://ajp.psychiatryonline.org/doi/abs/10.1176/ajp.150.1.149 |journal=American Journal of Psychiatry |volume=150 |issue=1 |pages=149–151 |doi=10.1176/ajp.150.1.149 |issn=0002-953X}}</ref> Abnormalities in the [[cave of septum pellucidum]] may also be present.<ref>{{Cite journal |last=Kwon |first=Jun Soo |last2=Shenton |first2=Martha E. |last3=Hirayasu |first3=Yoshio |last4=Salisbury |first4=Dean F. |last5=Fischer |first5=Iris A. |last6=Dickey |first6=Chandlee C. |last7=Yurgelun-Todd |first7=Deborah |last8=Tohen |first8=Mauricio |last9=Kikinis |first9=Ron |last10=Jolesz |first10=Ferenc A. |last11=McCarley |first11=Robert W. |date=1998-04-01 |title=MRI Study of Cavum Septi Pellucidi in Schizophrenia, Affective Disorder, and Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.155.4.509 |journal=American Journal of Psychiatry |volume=155 |issue=4 |pages=509–515 |doi=10.1176/ajp.155.4.509 |issn=0002-953X}}</ref> In people predisposed to the development of Schizophrenia spectrum disorders, the consumption of [[cannabis]] can induce the onset of StPD or other disorders with psychotic symptoms.<ref>{{Cite journal |last=Anglin |first=Deidre M. |last2=Corcoran |first2=Cheryl M. |last3=Brown |first3=Alan S. |last4=Chen |first4=Henian |last5=Lighty |first5=Quenesha |last6=Brook |first6=Judith S. |last7=Cohen |first7=Patricia R. |date=2012-05-01 |title=Early cannabis use and Schizotypal Personality Disorder Symptoms from adolescence to middle adulthood |url=https://www.sciencedirect.com/science/article/pii/S0920996412000448 |journal=Schizophrenia Research |language=en |volume=137 |issue=1 |pages=45–49 |doi=10.1016/j.schres.2012.01.019 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Davis |first=Glen P. |last2=Compton |first2=Michael T. |last3=Wang |first3=Shuai |last4=Levin |first4=Frances R. |last5=Blanco |first5=Carlos |date=2013-12-01 |title=Association between cannabis use, psychosis, and schizotypal personality disorder: Findings from the National Epidemiologic Survey on Alcohol and Related Conditions |url=https://www.sciencedirect.com/science/article/pii/S0920996413005641 |journal=Schizophrenia Research |language=en |volume=151 |issue=1 |pages=197–202 |doi=10.1016/j.schres.2013.10.018 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Hjorthøj |first=Carsten |last2=Albert |first2=Nikolai |last3=Nordentoft |first3=Merete |date=2018-07-01 |title=Association of Substance Use Disorders With Conversion From Schizotypal Disorder to Schizophrenia |url=https://doi.org/10.1001/jamapsychiatry.2018.0568 |journal=JAMA Psychiatry |volume=75 |issue=7 |pages=733–739 |doi=10.1001/jamapsychiatry.2018.0568 |issn=2168-622X}}</ref><ref>{{Cite journal |last=Fridberg |first=Daniel J. |last2=Vollmer |first2=Jennifer M. |last3=O'Donnell |first3=Brian F. |last4=Skosnik |first4=Patrick D. |date=2011-03-30 |title=Cannabis users differ from non-users on measures of personality and schizotypy |url=https://www.sciencedirect.com/science/article/pii/S0165178110004671 |journal=Psychiatry Research |language=en |volume=186 |issue=1 |pages=46–52 |doi=10.1016/j.psychres.2010.07.035 |issn=0165-1781}}</ref>
===Genetic===
A schizotypal personality disorder is widely understood to be a "[[Spectrum approach#Psychosis|schizophrenia spectrum]]" disorder. Rates of schizotypal personality disorder are much higher in relatives of individuals with schizophrenia than in the relatives of people with other mental illnesses or in people without mental illness. Technically speaking, a schizotypal personality disorder may also be considered an "[[extended phenotype]]" that helps geneticists track the familial or genetic transmission of the genes that are implicated in [[schizophrenia]] pathogenesis.<ref>{{cite journal |vauthors = Fogelson DL, Nuechterlein KH, Asar now RA, Payne DL, Subotnik KL, Jacobson KC, Neale MC, Kendler KS | display-authors = 6 | title = Avoidant personality disorder is a separable schizophrenia-spectrum personality disorder even when controlling for the presence of paranoid and schizotypal personality disorders The UCLA family study | journal = Schizophrenia Research | volume = 91 | issue = 1–3 | pages = 192–199 | date = March 2007 | pmid = 17306508 | pmc = 1904485 | doi = 10.1016/j.schres.2006.12.023 | publisher = Elsevier BV }}</ref> But there is also a genetic connection of STPD to mood disorders and depression in particular.<ref name="Comer">{{cite book |vauthors = Comer R, Comer G |chapter=Personality Disorders|chapter-url=http://bcs.worthpublishers.com/WebPub/Psychology/comerabpsych8e/IRM/COMER%20IR%20219-238.pdf |publisher=Worth Publishers |access-date=30 April 2017|archive-url=https://web.archive.org/web/20170517050914/http://bcs.worthpublishers.com/WebPub/Psychology/comerabpsych8e/IRM/COMER%20IR%20219-238.pdf|archive-date=2017-05-17|url-status=live}}</ref> Prediction of schizophrenia based on schizotypal traits has a higher accuracy for individuals with high genetic risk for STPD.<ref>{{cite journal | vauthors = Fonseca-Pedrero E, Ortuño J, Debbané M, Chan RC, Cicero D, Zhang LC, Brenner C, Barkus E, Linscott RJ, Kwapil T, Barrantes-Vidal N, Cohen A, Raine A, Compton MT, Tone EB, Suhr J, Inchausti F, Bobes J, Fumero A, Giakoumaki S, Tsaousis I, Preti A, Chmielewski M, Laloyaux J, Mechri A, Aymen Lahmar M, Wuthrich V, Larøi F, Badcock JC, Jablensky A, Isvoranu AM, Epskamp S, Fried EI | display-authors = 6 | title = The Network Structure of Schizotypal Personality Traits | journal = Schizophrenia Bulletin | volume = 44 | issue = suppl_2 | pages = S468–S479 | date = October 2018 | pmid = 29684178 | pmc = 6188518 | doi = 10.1093/schbul/sby044 }}</ref>


=== Environmental ===
Unique environmental factors, which differ from shared sibling experiences, have been found to play a role in the development of STPD and its dimensions. There is evidence to suggest that [[parenting styles]], early separation, childhood trauma, and childhood neglect can lead to the development of schizotypal traits.<ref>{{Cite journal |last=Dong |first=Fanghong |last2=Liu |first2=Jianghong |last3=Hodgson |first3=Nancy A. |last4=Medoff‐Cooper |first4=Barbara |date=2021 |title=Early life factors of schizotypal personality disorder in adolescents: A systematic review |url=https://onlinelibrary.wiley.com/doi/10.1111/jpm.12733 |journal=Journal of Psychiatric and Mental Health Nursing |language=en |volume=28 |issue=6 |pages=1092–1112 |doi=10.1111/jpm.12733 |issn=1351-0126 |via=[[Wiley Online Library]]}}</ref><ref>Deidre M. Anglina, Patricia R. Cohenab, Henian Chena (2008) Duration of early maternal separation and prediction of schizotypal symptoms from early adolescence to midlife, Schizophrenia Research Volume 103, Issue 1, Pages 143–150 (August 2008)</ref><ref>Howard Berenbaum, Ph.D., Eve M. Valera, Ph.D. and John G. Kerns, Ph.D. (2003) Psychological Trauma and Schizotypal Symptoms, Oxford Journals, Medicine, Schizophrenia Bulletin Volume 29, Number 1 Pp. 143–152</ref> Neglect, abuse, stress,<ref>{{Cite journal |last=Tessner |first=Kevin D. |last2=Mittal |first2=Vijay |last3=Walker |first3=Elaine F. |date=2011 |title=Longitudinal study of stressful life events and daily stressors among adolescents at high risk for psychotic disorders |url=https://pubmed.ncbi.nlm.nih.gov/19734244/ |journal=Schizophrenia Bulletin |volume=37 |issue=2 |pages=432–441 |doi=10.1093/schbul/sbp087 |issn=1745-1701 |pmc=3044629 |pmid=19734244 |via=[[PubMed]]}}</ref> trauma,<ref>{{Cite journal |last=Liu |first=Jianbo |last2=Gong |first2=Jingbo |last3=Nie |first3=Guanghui |last4=He |first4=Yuqiong |last5=Xiao |first5=Bo |last6=Shen |first6=Yanmei |last7=Luo |first7=Xuerong |date=2017-10-25 |title=The mediating effects of childhood neglect on the association between schizotypal and autistic personality traits and depression in a non-clinical sample |url=https://doi.org/10.1186/s12888-017-1510-0 |journal=BMC Psychiatry |volume=17 |issue=1 |pages=352 |doi=10.1186/s12888-017-1510-0 |issn=1471-244X |pmc=PMC5655952 |pmid=29065890}}</ref><ref>{{Cite journal |last=Anglin |first=Deidre M. |last2=Cohen |first2=Patricia R. |last3=Chen |first3=Henian |date=2008-08-01 |title=Duration of early maternal separation and prediction of schizotypal symptoms from early adolescence to midlife |url=https://www.sciencedirect.com/science/article/pii/S0920996408001321 |journal=Schizophrenia Research |language=en |volume=103 |issue=1 |pages=143–150 |doi=10.1016/j.schres.2008.02.016 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Berenbaum |first=Howard |last2=Thompson |first2=Renee J. |last3=Milanek |first3=Melissa E. |last4=Boden |first4=M. Tyler |last5=Bredemeier |first5=Keith |date=2008 |title=Psychological trauma and schizotypal personality disorder |url=https://pubmed.ncbi.nlm.nih.gov/18729605/ |journal=Journal of Abnormal Psychology |volume=117 |issue=3 |pages=502–519 |doi=10.1037/0021-843X.117.3.502 |issn=0021-843X |pmid=18729605 |via=[[PubMed]]}}</ref> or family dysfunction during childhood may increase the risk of developing schizotypal personality disorder.<ref name=":3">{{cite journal |vauthors=Lentz V, Robinson J, Bolton JM |date=November 2010 |title=Childhood adversity, mental disorder comorbidity, and suicidal behavior in schizotypal personality disorder |journal=The Journal of Nervous and Mental Disease |volume=198 |issue=11 |pages=795–801 |doi=10.1097/NMD.0b013e3181f9804c |pmid=21048469 |s2cid=205882039}}</ref><ref>{{Cite journal |last=Ericson |first=Marissa |last2=Tuvblad |first2=Catherine |last3=Raine |first3=Adrian |last4=Young-Wolff |first4=Kelly |last5=Baker |first5=Laura A. |date=2011-07-01 |title=Heritability and Longitudinal Stability of Schizotypal Traits During Adolescence |url=https://doi.org/10.1007/s10519-010-9401-x |journal=Behavior Genetics |language=en |volume=41 |issue=4 |pages=499–511 |doi=10.1007/s10519-010-9401-x |issn=1573-3297 |pmc=PMC3123391 |pmid=21369821}}</ref><ref>{{Cite journal |last=Wong |first=Keri K. |last2=Raine |first2=Adrian |date=2018-03-01 |title=Developmental Aspects of Schizotypy and Suspiciousness: a Review |url=https://doi.org/10.1007/s40473-018-0144-y |journal=Current Behavioral Neuroscience Reports |language=en |volume=5 |issue=1 |pages=94–101 |doi=10.1007/s40473-018-0144-y |issn=2196-2979 |pmc=PMC5857559 |pmid=29577010}}</ref> There is also evidence indicating that insults in the prenatal environment could affect the development of STPD.<ref>{{cite journal |display-authors=6 |vauthors=Machón RA, Huttunen MO, Mednick SA, Sinivuo J, Tanskanen A, Bunn Watson J, Henriksson M, Pyhälä R |date=March 2002 |title=Adult schizotypal personality characteristics and prenatal influenza in a Finnish birth cohort |journal=Schizophrenia Research |volume=54 |issue=1–2 |pages=7–16 |doi=10.1016/S0920-9964(01)00346-2 |pmid=11853973 |s2cid=20875584}}</ref> Over time, children learn to interpret social cues and respond appropriately but for unknown reasons this process does not work well for people with this disorder.<ref name="Schizotypal personality disorder">{{cite web |last=Mayo Clinic Staff |title=Schizotypal personality disorder |url=http://www.mayoclinic.com/health/schizotypal-personality-disorder/DS00830/DSECTION=causes |url-status=dead |archive-url=https://web.archive.org/web/20120309231644/http://www.mayoclinic.com:80/health/schizotypal-personality-disorder/DS00830/DSECTION=causes |archive-date=9 March 2012 |access-date=21 February 2012 |publisher=Mayo Clinic}}</ref> During childhood, people with StPD may have seen little [[Affect (psychology)|emotional expression]] from their parents. Another possibility is that they were excessively criticized or felt like they were constantly under threat.<ref>{{Cite journal |last=Dizinger |first=Julian Max Bernhard |last2=Doll |first2=Carolin Martha |last3=Rosen |first3=Marlene |last4=Gruen |first4=Michael |last5=Daum |first5=Lukas |last6=Schultze-Lutter |first6=Frauke |last7=Betz |first7=Linda |last8=Kambeitz |first8=Joseph |last9=Vogeley |first9=Kai |last10=Haidl |first10=Theresa Katharina |date=2022-08-01 |title=Does childhood trauma predict schizotypal traits? A path modelling approach in a cohort of help-seeking subjects |url=https://doi.org/10.1007/s00406-021-01373-6 |journal=European Archives of Psychiatry and Clinical Neuroscience |language=en |volume=272 |issue=5 |pages=909–922 |doi=10.1007/s00406-021-01373-6 |issn=1433-8491 |pmc=PMC9279245 |pmid=34982217}}</ref> Potentially resulting in the onset of social anxiety, strange thinking patterns,<ref>{{Cite journal |last=Powers |first=Abigail D. |last2=Thomas |first2=Katherine M. |last3=Ressler |first3=Kerry J. |last4=Bradley |first4=Bekh |date=2011-07-01 |title=The differential effects of child abuse and posttraumatic stress disorder on schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0010440X10001392 |journal=Comprehensive Psychiatry |language=en |volume=52 |issue=4 |pages=438–445 |doi=10.1016/j.comppsych.2010.08.001 |issn=0010-440X}}</ref> and blunted affect present in StPD.<ref>{{Cite journal |last=Cohen |first=Patricia |last2=Chen |first2=Henian |last3=Gordon |first3=Kathy |last4=Johnson |first4=Jeffrey |last5=Brook |first5=Judith |last6=Kasen |first6=Stephanie |date=2008 |title=Socioeconomic background and the developmental course of schizotypal and borderline personality disorder symptoms |url=https://www.cambridge.org/core/journals/development-and-psychopathology/article/abs/socioeconomic-background-and-the-developmental-course-of-schizotypal-and-borderline-personality-disorder-symptoms/5220AA583513E9E086B4653ECCD7DBC0 |journal=Development and Psychopathology |language=en |volume=20 |issue=2 |pages=633–650 |doi=10.1017/S095457940800031X |issn=1469-2198}}</ref><ref>{{Cite journal |last=Powers |first=Abigail D. |last2=Thomas |first2=Katherine M. |last3=Ressler |first3=Kerry J. |last4=Bradley |first4=Bekh |date=2011-07-01 |title=The differential effects of child abuse and posttraumatic stress disorder on schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0010440X10001392 |journal=Comprehensive Psychiatry |language=en |volume=52 |issue=4 |pages=438–445 |doi=10.1016/j.comppsych.2010.08.001 |issn=0010-440X}}</ref><ref>{{Cite journal |last=Velikonja |first=T. |last2=Velthorst |first2=E. |last3=McClure |first3=M. M. |last4=Rutter |first4=S. |last5=Calabrese |first5=W. R. |last6=Rosell |first6=D. |last7=Koenigsberg |first7=H. W. |last8=Goodman |first8=M. |last9=New |first9=A. S. |last10=Hazlett |first10=E. A. |last11=Perez‐Rodriguez |first11=M. M. |date=2019 |title=Severe childhood trauma and clinical and neurocognitive features in schizotypal personality disorder |url=https://onlinelibrary.wiley.com/doi/10.1111/acps.13032 |journal=Acta Psychiatrica Scandinavica |language=en |volume=140 |issue=1 |pages=50–64 |doi=10.1111/acps.13032 |issn=0001-690X |via=[[Wiley Online Library]]}}</ref> Their difficulties in social situations might eventually cause the individual to withdraw from most social interactions, thus leading to [[asociality]].<ref name="Roitman">{{cite journal |display-authors=6 |vauthors=Roitman SE, Cornblatt BA, Bergman A, Obuchowski M, Mitropoulou V, Keefe RS, Silverman JM, Siever LJ |date=May 1997 |title=Attentional functioning in schizotypal personality disorder |journal=The American Journal of Psychiatry |volume=154 |issue=5 |pages=655–660 |doi=10.1176/ajp.154.5.655 |pmid=9137121}}</ref> Children with schizotypal symptoms usually are more likely to indulge in [[Fantasy (psychology)|internal fantasies]],<ref>{{Cite journal |last=Esterberg |first=Michelle L. |last2=Goulding |first2=Sandra M. |last3=Walker |first3=Elaine F. |date=2010-12-01 |title=Cluster A Personality Disorders: Schizotypal, Schizoid and Paranoid Personality Disorders in Childhood and Adolescence |url=https://pubmed.ncbi.nlm.nih.gov/21116455/ |journal=Journal of Psychopathology and Behavioral Assessment |volume=32 |issue=4 |pages=515–528 |doi=10.1007/s10862-010-9183-8 |issn=0882-2689 |pmc=2992453 |pmid=21116455}}</ref> more anxious, socially isolated, and more sensitive to criticism.<ref>{{Cite journal |last=Olin |first=S. S. |last2=Raine |first2=A. |last3=Cannon |first3=T. D. |last4=Parnas |first4=J. |last5=Schulsinger |first5=F. |last6=Mednick |first6=S. A. |date=1997 |title=Childhood behavior precursors of schizotypal personality disorder |url=https://pubmed.ncbi.nlm.nih.gov/9050116/ |journal=Schizophrenia Bulletin |volume=23 |issue=1 |pages=93–103 |doi=10.1093/schbul/23.1.93 |issn=0586-7614 |pmid=9050116}}</ref> People with the most severe cases of StPD usually have a combination of childhood trauma and a genetic basis for their condition.<ref>{{Cite journal |last=Raine |first=Adrian |last2=Wong |first2=Keri Ka-Yee |last3=Liu |first3=Jianghong |date=2021-03-16 |title=The Schizotypal Personality Questionnaire for Children (SPQ-C): Factor Structure, Child Abuse, and Family History of Schizotypy |url=https://pubmed.ncbi.nlm.nih.gov/32674122/ |journal=Schizophrenia Bulletin |volume=47 |issue=2 |pages=323–331 |doi=10.1093/schbul/sbaa100 |issn=1745-1701 |pmc=8370046 |pmid=32674122}}</ref><ref>{{Cite journal |last=Berenbaum |first=Howard |last2=Valera |first2=Eve M. |last3=Kerns |first3=John G. |date=2003 |title=Psychological trauma and schizotypal symptoms |url=https://pubmed.ncbi.nlm.nih.gov/12908670/ |journal=Schizophrenia Bulletin |volume=29 |issue=1 |pages=143–152 |doi=10.1093/oxfordjournals.schbul.a006985 |issn=0586-7614 |pmid=12908670}}</ref>


== Signs and Symptoms ==
[[File:Paranoia (158822147).jpeg|thumb|190x190px|People with StPD can feel paranoid]]
[[File:Rotating snakes illusion.svg|thumb|186x186px|People with StPD can have abnormal sensory experiences]]


===Social and environmental===
=== Magical Thinking and Paranoia ===
Odd and [[magical thinking]] is common among people with StPD.<ref>{{Cite journal |last=Fonseca-Pedrero |first=Eduardo |last2=Ortuño |first2=Javier |last3=Debbané |first3=Martin |last4=Chan |first4=Raymond C. K. |last5=Cicero |first5=David |last6=Zhang |first6=Lisa C. |last7=Brenner |first7=Colleen |last8=Barkus |first8=Emma |last9=Linscott |first9=Richard J. |last10=Kwapil |first10=Thomas |last11=Barrantes-Vidal |first11=Neus |last12=Cohen |first12=Alex |last13=Raine |first13=Adrian |last14=Compton |first14=Michael T. |last15=Tone |first15=Erin B. |date=2018-10-15 |title=The Network Structure of Schizotypal Personality Traits |url=https://pubmed.ncbi.nlm.nih.gov/29684178/ |journal=Schizophrenia Bulletin |volume=44 |issue=suppl_2 |pages=S468–S479 |doi=10.1093/schbul/sby044 |issn=1745-1701 |pmc=6188518 |pmid=29684178}}</ref><ref>{{Cite journal |last=Davidson |first=Charlie A. |last2=Hoffman |first2=Lesa |last3=Spaulding |first3=William D. |date=2016-04-30 |title=Schizotypal personality questionnaire – brief revised (updated): An update of norms, factor structure, and item content in a large non-clinical young adult sample |url=https://www.sciencedirect.com/science/article/pii/S0165178115302420 |journal=Psychiatry Research |language=en |volume=238 |pages=345–355 |doi=10.1016/j.psychres.2016.01.053 |issn=0165-1781}}</ref><ref>{{Cite journal |last=Sokolova |first=E. |last2=Andreyuk |first2=K. |last3=Ryzhov |first3=A. |date=2021 |title=Relationship of abstract thinking to mentalization in schizophrenia |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9475916/ |journal=European Psychiatry |language=en |volume=64 |issue=S1 |pages=S527–S527 |doi=10.1192/j.eurpsy.2021.1407 |issn=0924-9338}}</ref> They are more likely to believe in [[supernatural]] phenomena and entities.<ref>{{Cite journal |last=Crespi |first=Bernard |last2=Dinsdale |first2=Natalie |last3=Read |first3=Silven |last4=Hurd |first4=Peter |date=2019-03-08 |title=Spirituality, dimensional autism, and schizotypal traits: The search for meaning |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0213456 |journal=PLOS ONE |language=en |volume=14 |issue=3 |pages=e0213456 |doi=10.1371/journal.pone.0213456 |issn=1932-6203 |pmc=PMC6407781 |pmid=30849096}}</ref><ref>{{Cite journal |last=Carvalho |first=Lucas de Francisco |last2=Sagradim |first2=Daniele Elvira Vaz |last3=Pianowski |first3=Giselle |last4=Gonçalves |first4=André Pereira |date=2020-10-19 |title=Relationship between religiosity domains and traits from borderline and schizotypal personality disorders in a Brazilian community sample |url=http://www.scielo.br/j/trends/a/ctgr9ppgkvmhSphvjvTjChj/?lang=en |journal=Trends in Psychiatry and Psychotherapy |language=en |volume=42 |pages=239–246 |doi=10.1590/2237-6089-2019-0085 |issn=2237-6089}}</ref><ref>{{Cite journal |last=Breslin |first=Michael J. |last2=Lewis |first2=Christopher Alan |date=2015-03-04 |title=Schizotypy and Religiosity : The Magic of Prayer |url=https://brill.com/view/journals/arp/37/1/article-p84_5.xml |journal=Archive for the Psychology of Religion |language=en |volume=37 |issue=1 |pages=84–97 |doi=10.1163/15736121-12341300 |issn=0084-6724}}</ref><ref>{{Cite journal |last=Byrom |first=Greg N. |date=2009 |title=Differential Relationships between Experiential and Interpretive Dimensions of Mysticism and Schizotypal Magical Ideation in a University Sample |url=http://journals.sagepub.com/doi/10.1163/157361209X424420 |journal=Archive for the Psychology of Religion |language=en |volume=31 |issue=2 |pages=127–150 |doi=10.1163/157361209X424420 |issn=0084-6724}}</ref> It is common for people with StPD to experience severe [[social anxiety]] and have [[Paranoia|paranoid ideation]].<ref>{{Cite journal |last=Farsham |first=Aida |last2=Abbaslou |first2=Tahereh |last3=Bidaki |first3=Reza |last4=Bozorg |first4=Bonnie |date=2017 |title=Comparing Facial Emotional Recognition in Patients with Borderline Personality Disorder and Patients with Schizotypal Personality Disorder with a Normal Group |url=https://pubmed.ncbi.nlm.nih.gov/28659980/ |journal=Iranian Journal of Psychiatry |volume=12 |issue=2 |pages=87–92 |issn=1735-4587 |pmc=5483242 |pmid=28659980}}</ref><ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=McCarley |first2=Robert W. |last3=Niznikiewicz |first3=Margaret A. |last4=Voglmaier |first4=Martina M. |last5=Seidman |first5=Larry J. |last6=Kim |first6=Sunnie |last7=Shenton |first7=Martha E. |date=2005-10-15 |title=Clinical, cognitive, and social characteristics of a sample of neuroleptic-naive persons with schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996405002070 |journal=Schizophrenia Research |language=en |volume=78 |issue=2 |pages=297–308 |doi=10.1016/j.schres.2005.05.016 |issn=0920-9964}}</ref> [[Ideas and delusions of reference|Ideas of reference]] are common in people with StPD.<ref>{{Citation |last=Wong |first=Keri Ka‐Yee |title=Schizotypal Personality Disorder |date=2020-09-18 |url=https://onlinelibrary.wiley.com/doi/10.1002/9781118970843.ch283 |work=The Wiley Encyclopedia of Personality and Individual Differences |pages=115–120 |editor-last=Carducci |editor-first=Bernardo J. |edition=1 |publisher=Wiley |language=en |doi=10.1002/9781118970843.ch283 |isbn=978-1-118-97074-4 |access-date=2022-10-29 |last2=Raine |first2=Adrian |editor2-last=Nave |editor2-first=Christopher S. |editor3-last=Nave |editor3-first=Christopher S.}}</ref><ref>{{Cite journal |last=Hummelen |first=Benjamin |last2=Pedersen |first2=Geir |last3=Karterud |first3=Sigmund |date=2012-05-01 |title=Some suggestions for the DSM-5 schizotypal personality disorder construct |url=https://www.sciencedirect.com/science/article/pii/S0010440X1100126X |journal=Comprehensive Psychiatry |language=en |volume=53 |issue=4 |pages=341–349 |doi=10.1016/j.comppsych.2011.05.009 |issn=0010-440X}}</ref><ref>{{Cite journal |last=Chan |first=Chi C. |last2=Bulbena-Cabre |first2=Andrea |last3=Rutter |first3=Sarah |last4=Benavides |first4=Caridad |last5=McClure |first5=Margaret M. |last6=Calabrese |first6=William |last7=Rosell |first7=Daniel R. |last8=Koenigsberg |first8=Harold W. |last9=Goodman |first9=Marianne |last10=New |first10=Antonia S. |last11=Hazlett |first11=Erin A. |last12=Mercedes Perez-Rodriguez |first12=M. |date=2019-07-01 |title=Comparison of self-report and clinician-rated schizotypal traits in schizotypal personality disorder and community controls |url=https://www.sciencedirect.com/science/article/pii/S0920996418307679 |journal=Schizophrenia Research |language=en |volume=209 |pages=263–268 |doi=10.1016/j.schres.2018.12.050 |issn=0920-9964}}</ref> They can feel as if expressing themselves is dangerous. They may also feel that others are more competent and have deeply entrenched and pervasive insecurities. Strange thinking patterns may be a [[Defence mechanism|defense mechanism]] against these feelings.<ref>{{Cite journal |last=Pattamanusorn |first=Nantida |last2=Wongpakaran |first2=Nahathai |last3=Thongpibul |first3=Kulvadee |last4=Wongpakaran |first4=Tinakon |last5=Kuntawong |first5=Pimolpun |date=2020-05-01 |title=Pathogenic beliefs among patients with schizotypal personality disorder |url=https://www.cell.com/heliyon/abstract/S2405-8440(20)30715-5 |url-status=live |journal=Heliyon |language=English |volume=6 |issue=5 |doi=10.1016/j.heliyon.2020.e03870 |issn=2405-8440 |pmid=32382682 |archive-url=https://web.archive.org/web/20221020222754/https://www.cell.com/heliyon/fulltext/S2405-8440%2820%2930715-5 |archive-date=October 20, 2022}}</ref> People with StPD usually have limited levels of [[self-awareness]].<ref>{{Cite journal |last=Raballo |first=Andrea |last2=Poletti |first2=Michele |last3=Preti |first3=Antonio |last4=Parnas |first4=Josef |date=2021-07-08 |title=The Self in the Spectrum: A Meta-analysis of the Evidence Linking Basic Self-Disorders and Schizophrenia |url=https://pubmed.ncbi.nlm.nih.gov/33479736/ |journal=Schizophrenia Bulletin |volume=47 |issue=4 |pages=1007–1017 |doi=10.1093/schbul/sbaa201 |issn=1745-1701 |pmc=8266610 |pmid=33479736}}</ref> They may believe others think of them more negatively than they actually do.<ref>{{Cite journal |last=Carlson |first=Erika N. |last2=Oltmanns |first2=Thomas F. |date=2015-08-01 |title=The Role of Metaperception in Personality Disorders: Do People with Personality Problems Know How Others Experience Their Personality? |url=https://guilfordjournals.com/doi/10.1521/pedi.2015.29.4.449 |journal=Journal of Personality Disorders |volume=29 |issue=4 |pages=449–467 |doi=10.1521/pedi.2015.29.4.449 |issn=0885-579X |pmc=PMC4760634 |pmid=26200846}}</ref>
Unique environmental factors, which differ from shared sibling experiences, have been found to play a role in the development of STPD and its dimensions.<ref name=":2">{{cite journal | vauthors = Rosell DR, Futterman SE, McMaster A, Siever LJ | title = Schizotypal personality disorder: a current review | journal = Current Psychiatry Reports | volume = 16 | issue = 7 | pages = 452 | date = July 2014 | pmid = 24828284 | pmc = 4182925 | doi = 10.1007/s11920-014-0452-1 }}</ref> There is now evidence to suggest that [[parenting styles]], early separation, trauma/maltreatment history (especially early childhood neglect) can lead to the development of schizotypal traits.<ref>Deidre M. Anglina, Patricia R. Cohenab, Henian Chena (2008) Duration of early maternal separation and prediction of schizotypal symptoms from early adolescence to midlife, Schizophrenia Research Volume 103, Issue 1, Pages 143–150 (August 2008)</ref><ref>Howard Berenbaum, Ph.D., Eve M. Valera, Ph.D. and John G. Kerns, Ph.D. (2003) Psychological Trauma and Schizotypal Symptoms, Oxford Journals, Medicine, Schizophrenia Bulletin Volume 29, Number 1 Pp. 143–152</ref> Neglect or abuse, trauma, or family dysfunction during childhood may increase the risk of developing schizotypal personality disorder. There is also evidence indicating influenza in the prenatal environment could have an effect on development of STPD.<ref>{{cite journal | vauthors = Machón RA, Huttunen MO, Mednick SA, Sinivuo J, Tanskanen A, Bunn Watson J, Henriksson M, Pyhälä R | display-authors = 6 | title = Adult schizotypal personality characteristics and prenatal influenza in a Finnish birth cohort | journal = Schizophrenia Research | volume = 54 | issue = 1–2 | pages = 7–16 | date = March 2002 | pmid = 11853973 | doi = 10.1016/S0920-9964(01)00346-2 | s2cid = 20875584 }}</ref> Over time, children learn to interpret social cues and respond appropriately but for unknown reasons this process does not work well for people with this disorder.<ref name="Schizotypal personality disorder">{{cite web|last=Mayo Clinic Staff |title=Schizotypal personality disorder |url=http://www.mayoclinic.com/health/schizotypal-personality-disorder/DS00830/DSECTION=causes |publisher=Mayo Clinic |access-date=21 February 2012 |archive-url=https://web.archive.org/web/20120309231644/http://www.mayoclinic.com:80/health/schizotypal-personality-disorder/DS00830/DSECTION=causes |archive-date=9 March 2012 }}</ref>


=== Affect ===
Schizotypal personality disorders are characterized by a common attentional impairment in various degrees that could serve as a marker of biological susceptibility to STPD.<ref name="Roitman">{{cite journal | vauthors = Roitman SE, Cornblatt BA, Bergman A, Obuchowski M, Mitropoulou V, Keefe RS, Silverman JM, Siever LJ | display-authors = 6 | title = Attentional functioning in schizotypal personality disorder | journal = The American Journal of Psychiatry | volume = 154 | issue = 5 | pages = 655–660 | date = May 1997 | pmid = 9137121 | doi = 10.1176/ajp.154.5.655 }}</ref> The reason is that an individual who has difficulties taking in information may find it difficult in complicated social situations where interpersonal cues and attentive communications are essential for quality interaction. This might eventually cause the individual to withdraw from most social interactions, thus leading to [[asociality]].<ref name="Roitman"/>
Patients with StPD can have difficulties in recognizing their or others' emotions.<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=Panych |first2=Lawrence P. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=Terry |first5=Douglas P. |last6=Murphy |first6=Cara |last7=Zacks |first7=Rayna |last8=Shenton |first8=Martha E. |last9=McCarley |first9=Robert W. |date=2011 |title=Facial emotion recognition and facial affect display in schizotypal personality disorder |url=https://www.infona.pl//resource/bwmeta1.element.elsevier-2196ddfb-f96c-38d4-9449-4476b6c0fbbb |journal=Schizophrenia Research |language=English |volume=1-3 |issue=131 |pages=242–249 |doi=10.1016/j.schres.2011.04.020 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Thakkar |first=Katharine N. |last2=Park |first2=Sohee |date=2010-09-01 |title=Empathy, schizotypy, and visuospatial transformations |url=https://doi.org/10.1080/13546801003711350 |journal=Cognitive Neuropsychiatry |volume=15 |issue=5 |pages=477–500 |doi=10.1080/13546801003711350 |issn=1354-6805 |pmid=20437282}}</ref> This can extend to difficulties expressing emotion.<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=Vu |first2=Mai-Anh T. |last3=Voglmaier |first3=Martina M. |last4=Niznikiewicz |first4=Margaret A. |last5=McCarley |first5=Robert W. |last6=Panych |first6=Lawrence P. |date=2012-12-01 |title=Prosodic abnormalities in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996412005294 |journal=Schizophrenia Research |language=en |volume=142 |issue=1 |pages=20–30 |doi=10.1016/j.schres.2012.09.006 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Phillips |first=Laura K. |last2=Seidman |first2=Larry J. |date=2008 |title=Emotion processing in persons at risk for schizophrenia |url=https://pubmed.ncbi.nlm.nih.gov/18644853/ |journal=Schizophrenia Bulletin |volume=34 |issue=5 |pages=888–903 |doi=10.1093/schbul/sbn085 |issn=0586-7614 |pmc=2518637 |pmid=18644853 |via=[[PubMed]]}}</ref> They may have limited responses to others' emotions and can be ambivalent.<ref>{{Cite journal |last=van 't Wout |first=Mascha |last2=Sanfey |first2=Alan G. |date=2011-01-30 |title=Interactive decision-making in people with schizotypal traits: A game theory approach |url=https://www.sciencedirect.com/science/article/pii/S0165178110002970 |journal=Psychiatry Research |language=en |volume=185 |issue=1 |pages=92–96 |doi=10.1016/j.psychres.2010.05.013 |issn=0165-1781}}</ref> It is common for people with StPD to derive limited joy from activities.<ref>{{Cite journal |last=Shi |first=Yan-fang |last2=Wang |first2=Yi |last3=Cao |first3=Xiao-yan |last4=Wang |first4=Ya |last5=Wang |first5=Yu-na |last6=Zong |first6=Ji-gang |last7=Xu |first7=Ting |last8=Tse |first8=Vincent W. S. |last9=Hsi |first9=Xiao-lu |last10=Stone |first10=William S. |last11=Lui |first11=Simon S. Y. |last12=Cheung |first12=Eric F. C. |last13=Chan |first13=Raymond C. K. |date=2012-05-16 |title=Experience of Pleasure and Emotional Expression in Individuals with Schizotypal Personality Features |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0034147 |journal=PLOS ONE |language=en |volume=7 |issue=5 |pages=e34147 |doi=10.1371/journal.pone.0034147 |issn=1932-6203 |pmc=PMC3353966 |pmid=22615731}}</ref><ref>{{Cite journal |last=Yan |first=Chao |last2=Liu |first2=Wen Hhua |last3=Cao |first3=Yuan |last4=Chan |first4=Raymond C. K. |date=2011 |title=Self-reported pleasure experience and motivation in individuals with schizotypal personality disorders proneness |url=https://pubmed.ncbi.nlm.nih.gov/21921305/ |journal=East Asian Archives of Psychiatry: Official Journal of the Hong Kong College of Psychiatrists = Dong Ya Jing Shen Ke Xue Zhi: Xianggang Jing Shen Ke Yi Xue Yuan Qi Kan |volume=21 |issue=3 |pages=115–122 |issn=2224-7041 |pmid=21921305 |via=[[PubMed]]}}</ref><ref>{{Cite journal |last=Horan |first=William P. |last2=Blanchard |first2=Jack J. |last3=Clark |first3=Lee Anna |last4=Green |first4=Michael F. |date=2008 |title=Affective traits in schizophrenia and schizotypy |url=https://pubmed.ncbi.nlm.nih.gov/18667393/ |journal=Schizophrenia Bulletin |volume=34 |issue=5 |pages=856–874 |doi=10.1093/schbul/sbn083 |issn=0586-7614 |pmc=2632479 |pmid=18667393 |via=[[PubMed]]}}</ref> People with StPD are typically more socially isolated and disinterested in social situations than most people.<ref>{{Cite journal |last=Geng |first=Fu-lei |last2=Xu |first2=Ting |last3=Wang |first3=Yi |last4=Shi |first4=Hai-song |last5=Yan |first5=Chao |last6=Neumann |first6=David L. |last7=Shum |first7=David HK |last8=Lui |first8=Simon SY |last9=Cheung |first9=Eric FC |last10=Chan |first10=Raymond CK |date=2013-11-29 |title=Developmental trajectories of schizotypal personality disorder-like behavioural manifestations: a two-year longitudinal prospective study of college students |url=https://doi.org/10.1186/1471-244X-13-323 |journal=BMC Psychiatry |volume=13 |issue=1 |pages=323 |doi=10.1186/1471-244X-13-323 |issn=1471-244X |pmc=PMC3875349 |pmid=24289659}}</ref><ref>{{Cite journal |last=Blanchard |first=Jack J. |last2=Aghevli |first2=Minu |last3=Wilson |first3=Amy |last4=Sargeant |first4=Marsha |date=2010-05-01 |title=Developmental instability in social anhedonia: An examination of minor physical anomalies and clinical characteristics |url=https://www.sciencedirect.com/science/article/pii/S0920996409005519 |journal=Schizophrenia Research |language=en |volume=118 |issue=1 |pages=162–167 |doi=10.1016/j.schres.2009.10.028 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Vinogradova |first=M. |last2=Chepeliuk |first2=A. |last3=Dorofeeva |first3=O. |date=2021 |title=Productivity of the performance of visual perceptual tasks and symptom severity in patients with schizotypal disorder |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9476036/ |journal=European Psychiatry |language=en |volume=64 |issue=S1 |pages=S525–S525 |doi=10.1192/j.eurpsy.2021.1402 |issn=0924-9338}}</ref> Although they can be socially active on the internet.<ref>{{Cite journal |last=Mittal |first=Vijay A. |last2=Tessner |first2=Kevin D. |last3=Walker |first3=Elaine F. |date=2007 |title=Elevated social Internet use and schizotypal personality disorder in adolescents |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2323598/ |journal=Schizophrenia research |volume=94 |issue=1-3 |pages=50–57 |doi=10.1016/j.schres.2007.04.009 |issn=0920-9964 |pmc=2323598 |pmid=17532188 |via=[[PubMed]]}}</ref> They can feel disconnected from themselves or others.<ref name=":1">{{Cite journal |last=Nelson |first=B. |last2=Rawlings |first2=D. |date=2010 |title=Relating schizotypy and personality to the phenomenology of creativity |url=https://pubmed.ncbi.nlm.nih.gov/18682376/ |journal=Schizophrenia Bulletin |volume=36 |issue=2 |pages=388–399 |doi=10.1093/schbul/sbn098 |issn=1745-1701 |pmc=2833116 |pmid=18682376 |via=[[PubMed]]}}</ref><ref>{{Cite journal |last=Værnes |first=Tor Gunnar |last2=Røssberg |first2=Jan Ivar |last3=Melle |first3=Ingrid |last4=Nelson |first4=Barnaby |last5=Romm |first5=Kristin Lie |last6=Møller |first6=Paul |date=2021-06-01 |title=Basic self-disturbance in subjects at clinical high risk for psychosis: Relationship with clinical and functional outcomes at one year follow-up |url=https://www.sciencedirect.com/science/article/pii/S0165178121002390 |journal=Psychiatry Research |language=en |volume=300 |pages=113942 |doi=10.1016/j.psychres.2021.113942 |issn=0165-1781}}</ref><ref>{{Cite journal |last=Værnes |first=Tor Gunnar |last2=Røssberg |first2=Jan Ivar |last3=Møller |first3=Paul |date=2019-08-01 |title=Anomalous self-experiences are strongly associated with negative symptoms in a clinical high-risk for psychosis sample |url=https://www.sciencedirect.com/science/article/pii/S0010440X19300331 |journal=Comprehensive Psychiatry |language=en |volume=93 |pages=65–72 |doi=10.1016/j.comppsych.2019.07.003 |issn=0010-440X}}</ref><ref name=":5">{{Cite journal |last=Zandersen |first=Maja |last2=Parnas |first2=Josef |date=2019-01-01 |title=Identity Disturbance, Feelings of Emptiness, and the Boundaries of the Schizophrenia Spectrum |url=https://pubmed.ncbi.nlm.nih.gov/29373752/ |journal=Schizophrenia Bulletin |volume=45 |issue=1 |pages=106–113 |doi=10.1093/schbul/sbx183 |issn=1745-1701 |pmc=6293220 |pmid=29373752}}</ref> Depersonalization,<ref>{{Cite journal |last=Francisco Carvalho |first=Lucas |last2=Magarotto Machado |first2=Gisele |last3=Padovani |first3=Sanny |last4=Pianowski |first4=Giselle |date=2021 |title=Measuring pathological traits of the schizotypal personality disorder through the HiTOP model |url=https://onlinelibrary.wiley.com/doi/10.1111/sjop.12761 |journal=Scandinavian Journal of Psychology |language=en |volume=62 |issue=6 |pages=839–845 |doi=10.1111/sjop.12761 |issn=0036-5564 |via=[[Wiley Online Library]]}}</ref><ref>{{Citation |last=Hamilton |first=Holly K. |title=Depersonalization/Derealization Disorder and Schizotypal Personality Disorder |date=2018-12-27 |url=https://onlinelibrary.wiley.com/doi/10.1002/9781118585948.ch15 |work=Psychosis, Trauma and Dissociation |pages=241–256 |editor-last=Moskowitz |editor-first=Andrew |edition=1 |publisher=Wiley |language=en |doi=10.1002/9781118585948.ch15 |isbn=978-1-119-95285-5 |access-date=2022-10-29 |last2=Simeon |first2=Daphne |editor2-last=Dorahy |editor2-first=Martin J. |editor3-last=Schäfer |editor3-first=Ingo}}</ref> derealization,<ref>{{Cite book |last=Hamilton |first=Holly |url=https://onlinelibrary.wiley.com/doi/10.1002/9781118585948.ch15 |title=Depersonalization/Derealization Disorder and Schizotypal Personality Disorder |last2=Simeon |first2=Daphne |date=November 19, 2018 |work=Psychosis, Trauma and Dissociation: Evolving Perspectives on Severe Psychopathology, Second Edition |publisher=[[Wiley]] |isbn=978-111-995-285-5 |language=en |doi=10.1002/9781118585948.ch15}}</ref> boredom,<ref name=":5" /> and internal fantasies are common in patients with StPD. Abnormal facial expressions are common in people with StPD. They can have aberrant [[Eye movement|eye movements]] and difficulty responding to stimuli.<ref>{{Cite journal |date=1984-12-01 |title=Impaired smooth pursuit eye movement: vulnerability marker for schizotypal personality disorder in a normal volunteer population |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.141.12.1560 |journal=American Journal of Psychiatry |volume=141 |issue=12 |pages=1560–1566 |doi=10.1176/ajp.141.12.1560 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Buchsbaum |first2=Monte S. |last3=Zhang |first3=Jing |last4=Newmark |first4=Randall E. |last5=Glanton |first5=Cathryn F. |last6=Zelmanova |first6=Yuliya |last7=Haznedar |first7=M. Mehmet |last8=Chu |first8=King-Wai |last9=Nenadic |first9=Igor |last10=Kemether |first10=Eileen M. |last11=Tang |first11=Cheuk Y. |last12=New |first12=Antonia S. |last13=Siever |first13=Larry J. |date=2008-09-01 |title=Frontal–striatal–thalamic mediodorsal nucleus dysfunction in schizophrenia-spectrum patients during sensorimotor gating |url=https://www.sciencedirect.com/science/article/pii/S1053811908006629 |journal=NeuroImage |language=en |volume=42 |issue=3 |pages=1164–1177 |doi=10.1016/j.neuroimage.2008.05.039 |issn=1053-8119}}</ref><ref>{{Cite journal |date=1990-06-01 |title=Eye tracking impairment in clinically identified patients with schizotypal personality disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.147.6.740 |journal=American Journal of Psychiatry |volume=147 |issue=6 |pages=740–745 |doi=10.1176/ajp.147.6.740 |issn=0002-953X}}</ref><ref>{{Cite journal |date=1994-08-01 |title=Eye movement impairment and schizotypal psychopathology |url=https://ajp.psychiatryonline.org/doi/abs/10.1176/ajp.151.8.1209 |journal=American Journal of Psychiatry |volume=151 |issue=8 |pages=1209–1215 |doi=10.1176/ajp.151.8.1209 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Cadenhead |first=Kristin S. |last2=Light |first2=Gregory A. |last3=Geyer |first3=Mark A. |last4=Braff |first4=David L. |date=2000-01-01 |title=Sensory Gating Deficits Assessed by the P50 Event-Related Potential in Subjects With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/full/10.1176/ajp.157.1.55 |journal=American Journal of Psychiatry |volume=157 |issue=1 |pages=55–59 |doi=10.1176/ajp.157.1.55 |issn=0002-953X}}</ref> Patients with StPD can also be more open to new experiences and ideas than most people.<ref name=":1" /><ref>{{Cite journal |last=Gurrera |first=Ronald J. |last2=Dickey |first2=Chandlee C. |last3=Niznikiewicz |first3=Margaret A. |last4=Voglmaier |first4=Martina M. |last5=Shenton |first5=Martha E. |last6=McCarley |first6=Robert W. |date=2005-12-15 |title=The five-factor model in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996405003580 |journal=Schizophrenia Research |language=en |volume=80 |issue=2 |pages=243–251 |doi=10.1016/j.schres.2005.08.002 |issn=0920-9964}}</ref> They are more likely to abuse substances or have [[suicidal ideation]].<ref>{{Cite journal |last=Raballo |first=Andrea |last2=Parnas |first2=Josef |date=2011 |title=The silent side of the spectrum: schizotypy and the schizotaxic self |url=https://pubmed.ncbi.nlm.nih.gov/20176859/ |journal=Schizophrenia Bulletin |volume=37 |issue=5 |pages=1017–1026 |doi=10.1093/schbul/sbq008 |issn=1745-1701 |pmc=3160219 |pmid=20176859 |via=[[PubMed]]}}</ref><ref>{{Cite journal |date=1997-02-01 |title=Symptoms, subtype, and suicidality in patients with schizophrenia spectrum disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.154.2.199 |journal=American Journal of Psychiatry |volume=154 |issue=2 |pages=199–204 |doi=10.1176/ajp.154.2.199 |issn=0002-953X}}</ref> Another epidemiological study on suicidal behavior in STPD found that, even when accounted for sociodemographic factors, people with STPD were 1.51 times more likely to attempt suicide.<ref name=":3" />


=== Cognitive impairments ===
==Diagnosis==
People with StPD tend to have [[Cognitive deficit|cognitive impairments]].<ref>{{Cite journal |last=Weiser |first=M. |last2=Noy |first2=S. |last3=Kaplan |first3=Z. |last4=Reichenberg |first4=A. |last5=Yazvitsky |first5=R. |last6=Nahon |first6=D. |last7=Grotto |first7=Itamar |last8=Knobler |first8=H. Y. |date=2003-01-01 |title=Generalized cognitive impairment in male adolescents with schizotypal personality disorder |url=https://pubmed.ncbi.nlm.nih.gov/12497611/ |journal=American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics: The Official Publication of the International Society of Psychiatric Genetics |volume=116B |issue=1 |pages=36–40 |doi=10.1002/ajmg.b.10853 |issn=1552-4841 |pmid=12497611}}</ref> They can have abnormal perceptional and sensory experiences such as [[Illusion|illusions]].<ref>{{Cite journal |last=Hazlett |first=Erin A. |last2=Rothstein |first2=Ethan G. |last3=Ferreira |first3=Rui |last4=Silverman |first4=Jeremy M. |last5=Siever |first5=Larry J. |last6=Olincy |first6=Ann |date=2015-02-01 |title=Sensory gating disturbances in the spectrum: Similarities and differences in schizotypal personality disorder and schizophrenia |url=https://www.sciencedirect.com/science/article/pii/S0920996414006975 |journal=Schizophrenia Research |language=en |volume=161 |issue=2 |pages=283–290 |doi=10.1016/j.schres.2014.11.020 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Cohen |first=Alex S. |last2=Auster |first2=Tracey L. |last3=MacAulay |first3=Rebecca K. |last4=McGovern |first4=Jessica E. |date=2014 |title=Illusory superiority and schizotypal personality: explaining the discrepancy between subjective/objective psychopathology |url=https://pubmed.ncbi.nlm.nih.gov/25150366/ |journal=Personality Disorders |volume=5 |issue=4 |pages=413–418 |doi=10.1037/per0000080 |issn=1949-2723 |pmc=4372844 |pmid=25150366 |via=[[PubMed]]}}</ref> For example, someone with StPD might perceive colors as lighter or darker than they really are.<ref>{{Cite journal |last=Fonseca-Pedrero |first=Eduardo |last2=Badoud |first2=Deborah |last3=Antico |first3=Lia |last4=Caputo |first4=Giovanni B. |last5=Eliez |first5=Stephan |last6=Schwartz |first6=Sophie |last7=Debbané |first7=Martin |date=2015 |title=Strange-face-in-the-mirror illusion and schizotypy during adolescence |url=https://pubmed.ncbi.nlm.nih.gov/25810060/ |journal=Schizophrenia Bulletin |volume=41 Suppl 2 |pages=S475–482 |doi=10.1093/schbul/sbu196 |issn=1745-1701 |pmc=4373638 |pmid=25810060 |via=[[PubMed]]}}</ref> [[Face perception|Facial perception]] may also be difficult for people with Schizotypal personality disorder.<ref>{{Cite journal |last=Leonards |first=Ute |last2=Mohr |first2=Christine |date=2009-09-30 |title=Schizotypal personality traits influence idiosyncratic initiation of saccadic face exploration |url=https://www.sciencedirect.com/science/article/pii/S0042698909003459 |journal=Vision Research |language=en |volume=49 |issue=19 |pages=2404–2413 |doi=10.1016/j.visres.2009.07.013 |issn=0042-6989 |via=[[Elsevier Science Direct]]}}</ref><ref>{{Cite journal |last=Ahn |first=Sangtae |last2=Lustenberger |first2=Caroline |last3=Jarskog |first3=L. Fredrik |last4=Fröhlich |first4=Flavio |date=2020-02-01 |title=Neurophysiological substrates of configural face perception in schizotypy |url=https://www.sciencedirect.com/science/article/pii/S0920996419305031 |journal=Schizophrenia Research |language=en |volume=216 |pages=389–396 |doi=10.1016/j.schres.2019.11.005 |issn=0920-9964 |via=[[Elsevier Science Direct]]}}</ref><ref>{{Cite journal |last=Terrien |first=Sarah |last2=Gobin |first2=Pamela |last3=Iakimova |first3=Galina |last4=Coutté |first4=Alexandre |last5=Thuaire |first5=Flavien |last6=Baltazart |first6=Véronique |last7=Mazzola-Pomietto |first7=Pascale |last8=Besche-Richard |first8=Chrystel |date=2015-12-22 |title=Electrophysiological correlates of emotional meaning in context in relation to facets of schizotypal personality traits: A dimensional study |url=http://dx.doi.org/10.1111/pcn.12366 |journal=Psychiatry and Clinical Neurosciences |volume=70 |issue=3 |pages=141–150 |doi=10.1111/pcn.12366 |issn=1323-1316}}</ref><ref>{{Cite journal |last=Mitropoulou |first=Vivian |last2=Harvey |first2=Phillip D. |last3=Zegarelli |first3=Gayle |last4=New |first4=Antonia S. |last5=Silverman |first5=Jeremy M. |last6=Siever |first6=Larry J. |date=2005-10-01 |title=Neuropsychological Performance in Schizotypal Personality Disorder: Importance of Working Memory |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.162.10.1896 |journal=American Journal of Psychiatry |volume=162 |issue=10 |pages=1896–1903 |doi=10.1176/appi.ajp.162.10.1896 |issn=0002-953X}}</ref> They can see others as deformed, may misrecognize them, or can feel as if they are alien to them.<ref>{{Cite journal |last=Fonseca-Pedrero |first=Eduardo |last2=Badoud |first2=Deborah |last3=Antico |first3=Lia |last4=Caputo |first4=Giovanni B. |last5=Eliez |first5=Stephan |last6=Schwartz |first6=Sophie |last7=Debbané |first7=Martin |date=2015 |title=Strange-face-in-the-mirror illusion and schizotypy during adolescence |url=https://pubmed.ncbi.nlm.nih.gov/25810060/ |journal=Schizophrenia Bulletin |volume=41 Suppl 2 |pages=S475–482 |doi=10.1093/schbul/sbu196 |issn=1745-1701 |pmc=4373638 |pmid=25810060 |via=[[PubMed]]}}</ref> People with StPD can have difficulty processing information such as speech or language.<ref>{{Cite journal |last=Rabella |first=Mireia |last2=Grasa |first2=Eva |last3=Corripio |first3=Iluminada |last4=Romero |first4=Sergio |last5=Mañanas |first5=Miquel Àngel |last6=Antonijoan |first6=Rosa Mª. |last7=Münte |first7=Thomas F. |last8=Pérez |first8=Víctor |last9=Riba |first9=Jordi |date=2016-01-01 |title=Neurophysiological evidence of impaired self-monitoring in schizotypal personality disorder and its reversal by dopaminergic antagonism |url=https://www.sciencedirect.com/science/article/pii/S221315821630095X |journal=NeuroImage: Clinical |language=en |volume=11 |pages=770–779 |doi=10.1016/j.nicl.2016.05.019 |issn=2213-1582}}</ref><ref>{{Cite journal |last=Niznikiewicz |first=Margaret A. |last2=Spencer |first2=Kevin M. |last3=Dickey |first3=Chandlee |last4=Voglmaier |first4=Martina |last5=Seidman |first5=Larry J. |last6=Shenton |first6=Martha E. |last7=McCarley |first7=Robert W. |date=2009-05-01 |title=Abnormal pitch mismatch negativity in individuals with schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996408004738 |journal=Schizophrenia Research |language=en |volume=110 |issue=1 |pages=188–193 |doi=10.1016/j.schres.2008.10.017 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Gilleen |first=James |last2=Tesse |first2=Marcello |last3=Velikonja |first3=Tjasa |last4=Weiser |first4=Mark |last5=Davidson |first5=Michael |last6=Reichenberg |first6=Abraham |date=2020-09-01 |title=Schizotypal traits and neuropsychological performance: The role of processing speed |url=https://www.sciencedirect.com/science/article/pii/S0920996420303832 |journal=Schizophrenia Research |language=en |volume=223 |pages=128–134 |doi=10.1016/j.schres.2020.06.030 |issn=0920-9964}}</ref> They are more likely to speak slowly, with less fluctuation in [[Pitch (music)|pitch]],<ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=Morocz |first2=Istvan A. |last3=Minney |first3=Daniel |last4=Niznikiewicz |first4=Margaret A. |last5=Voglmaier |first5=Martina M. |last6=Panych |first6=Lawrence P. |last7=Khan |first7=Usman |last8=Zacks |first8=Rayna |last9=Terry |first9=Douglas P. |last10=Shenton |first10=Martha E. |last11=McCarley |first11=Robert W. |date=2010-08-01 |title=Factors in sensory processing of prosody in schizotypal personality disorder: An fMRI experiment |url=https://www.sciencedirect.com/science/article/pii/S0920996410011783 |journal=Schizophrenia Research |language=en |volume=121 |issue=1 |pages=75–89 |doi=10.1016/j.schres.2010.03.008 |issn=0920-9964}}</ref> and have periods of silence. Individuals with StPD may communicate with others differently .<ref>{{Cite journal |last=Muller |first=Anne-Marie |last2=Dalal |first2=Tyler C. |last3=Stevenson |first3=Ryan A. |date=2021-07-01 |title=Schizotypal personality traits and multisensory integration: An investigation using the McGurk effect |url=https://www.sciencedirect.com/science/article/pii/S0001691821001049 |journal=Acta Psychologica |language=en |volume=218 |pages=103354 |doi=10.1016/j.actpsy.2021.103354 |issn=0001-6918}}</ref><ref>{{Cite journal |last=Rass |first=Olga |last2=Leynes |first2=P. Andrew |last3=Hetrick |first3=William P. |last4=O'Donnell |first4=Brian F. |date=2011-12-01 |title=Memory blocking in schizophrenia reflects deficient retrieval control mechanisms |url=https://www.sciencedirect.com/science/article/pii/S0920996411003951 |journal=Schizophrenia Research |language=en |volume=133 |issue=1 |pages=182–186 |doi=10.1016/j.schres.2011.07.024 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Voglmaier |first=Martina M. |last2=Seidman |first2=Larry J. |last3=Niznikiewicz |first3=Margaret A. |last4=Dickey |first4=Chandlee C. |last5=Shenton |first5=Martha E. |last6=McCarley |first6=Robert W. |date=2000-05-01 |title=Verbal and Nonverbal Neuropsychological Test Performance in Subjects With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.157.5.787 |journal=American Journal of Psychiatry |volume=157 |issue=5 |pages=787–793 |doi=10.1176/appi.ajp.157.5.787 |issn=0002-953X}}</ref> Patients with StPD may have a lower [[odor detection threshold]],<ref>{{Cite journal |last=Mathur |first=Naina |last2=Dawes |first2=Christopher |last3=Moran |first3=Paula M. |date=2019-07-01 |title=Olfactory threshold selectively predicts positive psychometric schizotypy |url=https://www.sciencedirect.com/science/article/pii/S0920996419301756 |journal=Schizophrenia Research |language=en |volume=209 |pages=80–87 |doi=10.1016/j.schres.2019.05.014 |issn=0920-9964}}</ref> and can have impaired [[Auditory system|auditory]] or [[Sense of smell|olfactory processing]].<ref>{{Cite journal |last=Brenner |first=Colleen A. |last2=Sporns |first2=Olaf |last3=Lysaker |first3=Paul H. |last4=O’Donnell |first4=Brian F. |date=2003-12-01 |title=EEG Synchronization to Modulated Auditory Tones in Schizophrenia, Schizoaffective Disorder, and Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.160.12.2238 |journal=American Journal of Psychiatry |volume=160 |issue=12 |pages=2238–2240 |doi=10.1176/appi.ajp.160.12.2238 |issn=0002-953X}}</ref> It is also common for people with StPD to have impaired [[Context effect|context processing]].<ref>{{Cite journal |last=Niznikiewicz |first=Margaret A. |last2=Shenton |first2=Martha E. |last3=Voglmaier |first3=Martina |last4=Nestor |first4=Paul G. |last5=Dickey |first5=Chandlee C. |last6=Frumin |first6=Melissa |last7=Seidman |first7=Larry J. |last8=Allen |first8=Christopher G. |last9=McCarley |first9=Robert W. |date=2002-10-01 |title=Semantic Dysfunction in Women With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.159.10.1767 |journal=American Journal of Psychiatry |volume=159 |issue=10 |pages=1767–1774 |doi=10.1176/appi.ajp.159.10.1767 |issn=0002-953X}}</ref><ref>{{Cite journal |last=McClure |first=Margaret M. |last2=Barch |first2=Deanna M. |last3=Flory |first3=Janine D. |last4=Harvey |first4=Philip D. |last5=Siever |first5=Larry J. |date=2008 |title=Context processing in schizotypal personality disorder: evidence of specificity of impairment to the schizophrenia spectrum |url=https://pubmed.ncbi.nlm.nih.gov/18489210/ |journal=Journal of Abnormal Psychology |volume=117 |issue=2 |pages=342–354 |doi=10.1037/0021-843X.117.2.342 |issn=0021-843X |pmc=4176884 |pmid=18489210 |via=[[PubMed]]}}</ref> Which means they can form loose connections between events.<ref>{{Cite journal |last=Kiang |first=Michael |last2=Prugh |first2=Jocelyn |last3=Kutas |first3=Marta |date=2010-02-01 |title=An event-related brain potential study of schizotypal personality and associative semantic processing |url=https://www.sciencedirect.com/science/article/pii/S0167876009002566 |journal=International Journal of Psychophysiology |series=Psychophysiology of Language Processes in Psychopathology |language=en |volume=75 |issue=2 |pages=119–126 |doi=10.1016/j.ijpsycho.2009.10.005 |issn=0167-8760}}</ref> In addition, people with StPD can have decreased capacities for [[multisensory integration]] or [[Contrast (vision)|contrast sensitivity]].<ref>{{Cite journal |last=Kent |first=Brendon W. |last2=Weinstein |first2=Zachary A. |last3=Passarelli |first3=Vincent |last4=Chen |first4=Yue |last5=Siever |first5=Larry J. |date=2011-04-01 |title=Deficient visual sensitivity in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996410013095 |journal=Schizophrenia Research |language=en |volume=127 |issue=1 |pages=144–150 |doi=10.1016/j.schres.2010.05.013 |issn=0920-9964 |via=[[Elsevier Science Direct]]}}</ref><ref>{{Cite journal |last=Harper |first=Lauren |last2=Spencer |first2=Emily |last3=Davidson |first3=Colin |last4=Hutchinson |first4=Claire V. |date=2020-01-01 |title=Selectively reduced contrast sensitivity in high schizotypy |url=https://doi.org/10.1007/s00221-019-05695-9 |journal=Experimental Brain Research |language=en |volume=238 |issue=1 |pages=51–62 |doi=10.1007/s00221-019-05695-9 |issn=1432-1106 |pmc=PMC6957544 |pmid=31781821}}</ref><ref>{{Cite journal |last=Ferri |first=Francesca |last2=Ambrosini |first2=Ettore |last3=Costantini |first3=Marcello |date=2016-12-09 |title=Spatiotemporal processing of somatosensory stimuli in schizotypy |url=https://www.nature.com/articles/srep38735 |journal=Scientific Reports |language=en |volume=6 |issue=1 |pages=38735 |doi=10.1038/srep38735 |issn=2045-2322}}</ref><ref>{{Cite journal |last=Dalal |first=Tyler C. |last2=Muller |first2=Anne-Marie |last3=Stevenson |first3=Ryan A. |date=2021-02-09 |title=The Relationship Between Multisensory Temporal Processing and Schizotypal Traits |url=https://brill.com/view/journals/msr/34/5/article-p511_4.xml |journal=Multisensory Research |volume=34 |issue=5 |pages=511–529 |doi=10.1163/22134808-bja10044 |issn=2213-4808}}</ref> either hyperreactive or impaired reactions to sensory input,<ref>{{Cite journal |last=Mannan |first=Md Rakibul |last2=Hiramatsu |first2=Ken-Ichi |last3=Hokama |first3=Hiroto |last4=Ohta |first4=Hirokazu |date=2001 |title=Abnormalities of auditory event-related potentials in students with schizotypal personality disorder |url=http://doi.wiley.com/10.1046/j.1440-1819.2001.00889.x |journal=Psychiatry and Clinical Neurosciences |language=en |volume=55 |issue=5 |pages=451–457 |doi=10.1046/j.1440-1819.2001.00889.x |issn=1323-1316}}</ref><ref>{{Cite journal |last=Niznikiewicz |first=Margaret A. |last2=Friedman |first2=Michelle |last3=Shenton |first3=Martha E. |last4=Voglmaier |first4=Martina |last5=Nestor |first5=Paul G. |last6=Frumin |first6=Melissa |last7=Seidman |first7=Larry |last8=Sutton |first8=John |last9=McCarley |first9=Robert W. |date=2004 |title=Processing sentence context in women with schizotypal personality disorder: An ERP study: Sentence processing in SPD |url=https://onlinelibrary.wiley.com/doi/10.1111/1469-8986.2004.00173.x |journal=Psychophysiology |language=en |volume=41 |issue=3 |pages=367–371 |doi=10.1111/1469-8986.2004.00173.x |pmc=PMC2794422 |pmid=15102121}}</ref><ref>{{Cite journal |last=Dickey |first=Chandlee C. |last2=Morocz |first2=Istvan A. |last3=Niznikiewicz |first3=Margaret A. |last4=Voglmaier |first4=Martina |last5=Toner |first5=Sarah |last6=Khan |first6=Usman |last7=Dreusicke |first7=Mark |last8=Yoo |first8=Seung-Schik |last9=Shenton |first9=Martha E. |last10=McCarley |first10=Robert W. |date=2008-08-01 |title=Auditory processing abnormalities in schizotypal personality disorder: An fMRI experiment using tones of deviant pitch and duration |url=https://www.sciencedirect.com/science/article/pii/S0920996408002132 |journal=Schizophrenia Research |language=en |volume=103 |issue=1 |pages=26–39 |doi=10.1016/j.schres.2008.04.041 |issn=0920-9964}}</ref> slower response times,<ref>{{Cite journal |last=Cadenhead |first=Kristin S. |last2=Light |first2=Gregory A. |last3=Geyer |first3=Mark A. |last4=Braff |first4=David L. |date=2000-01-01 |title=Sensory Gating Deficits Assessed by the P50 Event-Related Potential in Subjects With Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/full/10.1176/ajp.157.1.55 |journal=American Journal of Psychiatry |volume=157 |issue=1 |pages=55–59 |doi=10.1176/ajp.157.1.55 |issn=0002-953X}}</ref> impaired [[attention]],<ref>{{Cite journal |last=Hur |first=Ji-Won |last2=Kim |first2=Taekwan |last3=Cho |first3=Kang Ik K. |last4=Kwon |first4=Jun Soo |date=2021 |title=Attenuated Resting-State Functional Anticorrelation between Attention and Executive Control Networks in Schizotypal Personality Disorder |url=https://www.mdpi.com/2077-0383/10/2/312 |journal=Journal of Clinical Medicine |language=en |volume=10 |issue=2 |pages=312 |doi=10.3390/jcm10020312 |issn=2077-0383 |via=[[MDPI]]}}</ref><ref>{{Cite journal |last=Trotman |first=Hanan |last2=McMillan |first2=Amanda |last3=Walker |first3=Elaine |date=2006 |title=Cognitive function and symptoms in adolescents with schizotypal personality disorder |url=https://pubmed.ncbi.nlm.nih.gov/16611879/ |journal=Schizophrenia Bulletin |volume=32 |issue=3 |pages=489–497 |doi=10.1093/schbul/sbj069 |issn=0586-7614 |pmc=2632245 |pmid=16611879 |via=[[PubMed]]}}</ref><ref>{{Cite journal |date=1997-05-01 |title=Attentional functioning in schizotypal personality disorder [published erratum appears in Am J Psychiatry 1997 Aug;154(8):1180] |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.154.5.655 |journal=American Journal of Psychiatry |volume=154 |issue=5 |pages=655–660 |doi=10.1176/ajp.154.5.655 |issn=0002-953X}}</ref> poorer [[Posture (psychology)|postural]] control,<ref>{{Cite journal |last=Apthorp |first=Deborah |last2=Bolbecker |first2=Amanda |last3=Bartolomeo |first3=Lisa |last4=Hetrick |first4=William |last5=O’Donnell |first5=Brian |date=October 30, 2018 |title=Postural Sway Abnormalities in Schizotypal Personality Disorder |url=https://academic.oup.com/schizophreniabulletin/article/45/3/512/5146830?login=false |url-status=live |journal=[[Schizophrenia Bulletin]] |volume=45 |issue=3 |doi=10.1093/schbul/sby141 |access-date=2022-10-20 |via=[[Oxford Academic]]}}</ref> and difficulties with decision-making.<ref>{{Cite journal |last=Niznikiewicz |first=Margaret A. |last2=Voglmaier |first2=Martina M. |last3=Shenton |first3=Martha E. |last4=Dickey |first4=Chandlee C. |last5=Seidman |first5=Larry J. |last6=Teh |first6=EngKeat |last7=Rhoads |first7=Richard Van |last8=McCarley |first8=Robert W. |date=2000-10-01 |title=Lateralized P3 deficit in schizotypal personality disorder |url=https://www.biologicalpsychiatryjournal.com/article/S0006-3223(00)00938-0/abstract |journal=Biological Psychiatry |language=English |volume=48 |issue=7 |pages=702–705 |doi=10.1016/S0006-3223(00)00938-0 |issn=0006-3223}}</ref><ref>{{Cite journal |last=Forsyth |first=Jennifer K. |last2=Bolbecker |first2=Amanda R. |last3=Mehta |first3=Crystal S. |last4=Klaunig |first4=Mallory J. |last5=Steinmetz |first5=Joseph E. |last6=O'Donnell |first6=Brian F. |last7=Hetrick |first7=William P. |date=2012 |title=Cerebellar-dependent eyeblink conditioning deficits in schizophrenia spectrum disorders |url=https://pubmed.ncbi.nlm.nih.gov/21148238/ |journal=Schizophrenia Bulletin |volume=38 |issue=4 |pages=751–759 |doi=10.1093/schbul/sbq148 |issn=1745-1701 |pmc=3406528 |pmid=21148238 |via=[[PubMed]]}}</ref> People with StPD can have difficulties in [[memory]],<ref>{{Cite journal |last=Farmer |first=Carrie M. |last2=O’Donnell |first2=Brian F. |last3=Niznikiewicz |first3=Margaret A. |last4=Voglmaier |first4=Martina M. |last5=McCarley |first5=Robert W. |last6=Shenton |first6=Martha E. |date=2000-05-01 |title=Visual Perception and Working Memory in Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.157.5.781 |journal=American Journal of Psychiatry |volume=157 |issue=5 |pages=781–788 |doi=10.1176/appi.ajp.157.5.781 |issn=0002-953X}}</ref><ref>{{Cite journal |last=Shin |first=Yong-Wook |last2=Krishnan |first2=Giri |last3=Hetrick |first3=William P. |last4=Brenner |first4=Colleen A. |last5=Shekhar |first5=Anantha |last6=Malloy |first6=Frederick W. |last7=O'Donnell |first7=Brian F. |date=2010-12-01 |title=Increased temporal variability of auditory event-related potentials in schizophrenia and Schizotypal Personality Disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996410014544 |journal=Schizophrenia Research |language=en |volume=124 |issue=1 |pages=110–118 |doi=10.1016/j.schres.2010.08.008 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Goldstein |first=Kim E. |last2=Hazlett |first2=Erin A. |last3=Savage |first3=Kimberley R. |last4=Berlin |first4=Heather A. |last5=Hamilton |first5=Holly K. |last6=Zelmanova |first6=Yuliya |last7=Look |first7=Amy E. |last8=Koenigsberg |first8=Harold W. |last9=Mitsis |first9=Effie M. |last10=Tang |first10=Cheuk Y. |last11=McNamara |first11=Margaret |last12=Siever |first12=Larry J. |last13=Cohen |first13=Barry H. |last14=New |first14=Antonia S. |date=2011-04-15 |title=Dorso- and ventro-lateral prefrontal volume and spatial working memory in schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0166432810007679 |journal=Behavioural Brain Research |language=en |volume=218 |issue=2 |pages=335–340 |doi=10.1016/j.bbr.2010.11.042 |issn=0166-4328}}</ref> and may have frequent intrusive memories of events.<ref>{{Cite journal |last=Jones |first=Vanessa |last2=Steel |first2=Craig |date=2012-09-01 |title=Schizotypal personality and vulnerability to involuntary autobiographical memories |url=https://www.sciencedirect.com/science/article/pii/S0005791611001339 |journal=Journal of Behavior Therapy and Experimental Psychiatry |language=en |volume=43 |issue=3 |pages=871–876 |doi=10.1016/j.jbtep.2011.12.008 |issn=0005-7916}}</ref> It is common for people with StPD to feel [[Déjà vu]] or as if they can accurately predict future events due to abnormalities in the brain's memory storage.<ref>{{Cite journal |last=Arzy |first=Shahar |last2=Mohr |first2=Christine |last3=Molnar-Szakacs |first3=Istvan |last4=Blanke |first4=Olaf |date=2011-01-18 |title=Schizotypal Perceptual Aberrations of Time: Correlation between Score, Behavior and Brain Activity |url=https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0016154 |journal=PLOS ONE |language=en |volume=6 |issue=1 |pages=e16154 |doi=10.1371/journal.pone.0016154 |issn=1932-6203 |pmc=PMC3022658 |pmid=21267456}}</ref>


=== Screening ===
== Treatment ==
There are various methods of screening for schizotypal personality. The Schizotypal Personality Questionnaire (SPQ) measures nine traits of STPD using a [[Self-report study|self-report]] assessment. The nine traits referenced are Ideas of Reference, Excessive Social Anxiety, Odd Beliefs or Magical Thinking, Unusual Perceptual Experiences, Odd or Eccentric Behavior, No Close Friends, Odd Speech, Constricted Affect, and Suspiciousness. A study found that of the participants who scored in the top 10th percentile of all the SPQ scores, 55% were clinically diagnosed with STPD.<ref>{{cite journal | vauthors = Raine A | title = The SPQ: a scale for the assessment of schizotypal personality based on DSM-III-R criteria | journal = Schizophrenia Bulletin | volume = 17 | issue = 4 | pages = 555–564 | date = 1991 | pmid = 1805349 | doi = 10.1093/schbul/17.4.555 }}</ref> A method that measures the risk for developing psychosis through self-reports is the Wisconsin Schizotypy Scale (WSS).<ref>{{Cite journal | vauthors = Winterstein BP, Silvia PJ, Kwapil TR, Kaufman JC, Reiter-Palmon R, Wigert |date=2011 |title=Brief assessment of schizotypy: Developing short forms of the Wisconsin Schizotypy Scales |url=https://linkinghub.elsevier.com/retrieve/pii/S0191886911003539 |journal=Personality and Individual Differences |language=en |volume=51 |issue=8 |pages=920–924 |doi=10.1016/j.paid.2011.07.027}}</ref> The WSS divides schizotypal personality traits into 4 scales for Perceptual Aberration, Magical Ideation, Revised Social Anhedonia, and Physical Anhedonia.<ref>''[http://apps.who.int/classifications/icd10/browse/2015/en#/F21 Schizotypal Disorder] {{Webarchive|url=https://web.archive.org/web/20151102042503/http://apps.who.int/classifications/icd10/browse/2015/en#/F21#/F21|date=2015-11-02}}'' in ICD-10: [https://www.who.int/classifications/icd/en/bluebook.pdf#84 Clinical descriptions and guidelines.] {{Webarchive|url=https://web.archive.org/web/20140323025330/http://www.who.int/classifications/icd/en/bluebook.pdf#84#84|date=2014-03-23}}</ref><ref name=":0">{{cite journal | vauthors = Gross GM, Mellin J, Silvia PJ, Barrantes-Vidal N, Kwapil TR | title = Comparing the factor structure of the Wisconsin Schizotypy Scales and the Schizotypal Personality Questionnaire | journal = Personality Disorders | volume = 5 | issue = 4 | pages = 397–405 | date = October 2014 | pmid = 25314229 | doi = 10.1037/per0000090 | url = http://libres.uncg.edu/ir/uncg/f/T_Kwapil_Comparing_2014.pdf }}</ref><ref name="DSM 5" /> A comparison of the SPQ and the WSS suggests that these measures should be cautiously used for screening purposes of STPD.<ref name=":0" />


=== STPD as a Personality Disorder ===
=== Medication ===
[[File:Risperidone-3D-balls.png|thumb|281x281px|[[Ball-and-stick model]] of Risperidone, a drug used to treat StPD]]
[[File:Cognitive behavioral therapy - basic tenets.svg|thumb|168x168px|Model of Cognitive behavioral therapy, a type of therapy used to treat StPD]]STPD is rarely seen as the primary reason for treatment in a clinical setting, but it often occurs as a comorbid finding with other mental disorders. When patients with STPD have prescribed pharmaceuticals, they are usually prescribed [[Antipsychotic|antipsychotics]],<ref>{{Cite journal |last=Bachetti |first=Massimo |last2=Cirimbilli |first2=Federica |last3=Pierotti |first3=Valentina |last4=Menculini |first4=Giulia |last5=Tortorella |first5=Alfonso |last6=Moretti |first6=Patrizia |title=A DUAL THERAPEUTIC SETTING MODEL EXPERIENCE FOR SCHIZOTYPAL PERSONALITY DISORDER IN AN INPATIENT UNIT |url=https://www.psychiatria-danubina.com/UserDocsImages/pdf/dnb_vol32_noSuppl%201/dnb_vol32_noSuppl%201_194.pdf |journal=[[Psychiatria Danubina]] |publication-place=[[Zagreb]] |volume=32 |via=[[PubMed]]}}</ref><ref>{{Cite journal |last=Rass |first=Olga |last2=Forsyth |first2=Jennifer K. |last3=Krishnan |first3=Giri P. |last4=Hetrick |first4=William P. |last5=Klaunig |first5=Mallory J. |last6=Breier |first6=Alan |last7=O'Donnell |first7=Brian F. |last8=Brenner |first8=Colleen A. |date=2012-04-01 |title=Auditory steady state response in the schizophrenia, first-degree relatives, and schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996412000059 |journal=Schizophrenia Research |language=en |volume=136 |issue=1 |pages=143–149 |doi=10.1016/j.schres.2012.01.003 |issn=0920-9964}}</ref><ref>{{Cite journal |last=Dadić-Hero |first=Elizabeta |last2=Ruzić |first2=Klementina |last3=Medved |first3=Paola |last4=Tatalović-Vorkapić |first4=Sanja |last5=Graovac |first5=Mirjana |date=2010 |title=Antipsychotic side-effect - potential risk of patients rejecting their treatments |url=https://pubmed.ncbi.nlm.nih.gov/20305602/ |journal=Psychiatria Danubina |volume=22 |issue=1 |pages=105–107 |issn=0353-5053 |pmid=20305602 |via=[[PubMed]]}}</ref> however, the use of neuroleptic drugs in the schizotypal population is in great doubt.<ref name="Livesley 012">{{cite book |title=Handbook of personality disorders : theory, research, and treatment |vauthors=Livesley W |publisher=Guilford Press |year=2001 |isbn=978-1-57230-629-5 |oclc=45750508}}</ref> The antipsychotics which show promise as treatments for StPD are [[Olanzapine/fluoxetine|olanzapine]],<ref>{{Cite journal |last=Keshavan |first=Matcheri |last2=Shad |first2=Mujeeb |last3=Soloff |first3=Paul |last4=Schooler |first4=Nina |date=2004-11-01 |title=Efficacy and tolerability of olanzapine in the treatment of schizotypal personality disorder |url=https://www.sciencedirect.com/science/article/pii/S0920996404000106 |journal=Schizophrenia Research |language=en |volume=71 |issue=1 |pages=97–101 |doi=10.1016/j.schres.2003.12.008 |issn=0920-9964}}</ref> [[risperidone]],<ref>{{Cite journal |last=McClure |first=Margaret M. |last2=Koenigsberg |first2=Harold W. |last3=Reynolds |first3=Diedre |last4=Goodman |first4=Marianne |last5=New |first5=Antonia |last6=Trestman |first6=Robert |last7=Silverman |first7=Jeremy |last8=Harvey |first8=Philip D. |last9=Siever |first9=Larry J. |date=2009 |title=The Effects of Risperidone on the Cognitive Performance of Individuals With Schizotypal Personality Disorder |url=https://journals.lww.com/psychopharmacology/Citation/2009/08000/The_Effects_of_Risperidone_on_the_Cognitive.20.aspx |journal=Journal of Clinical Psychopharmacology |language=en-US |volume=29 |issue=4 |pages=396–398 |doi=10.1097/JCP.0b013e3181accfd9 |issn=0271-0749}}</ref><ref>{{Cite journal |last=Kirchner |first=Sophie K. |last2=Roeh |first2=Astrid |last3=Nolden |first3=Jana |last4=Hasan |first4=Alkomiet |date=2018-10-03 |title=Diagnosis and treatment of schizotypal personality disorder: evidence from a systematic review |url=https://www.nature.com/articles/s41537-018-0062-8 |journal=npj Schizophrenia |language=en |volume=4 |issue=1 |pages=1–18 |doi=10.1038/s41537-018-0062-8 |issn=2334-265X}}</ref> [[haloperidol]],<ref>{{Cite journal |last=Jakobsen |first=Klaus Damgaard |last2=Skyum |first2=Eva |last3=Hashemi |first3=Nasseh |last4=Schjerning |first4=Ole |last5=Fink-Jensen |first5=Anders |last6=Nielsen |first6=Jimmi |date=2017 |title=Antipsychotic treatment of schizotypy and schizotypal personality disorder: a systematic review |url=http://journals.sagepub.com/doi/10.1177/0269881117695879 |journal=Journal of Psychopharmacology |language=en |volume=31 |issue=4 |pages=397–405 |doi=10.1177/0269881117695879 |issn=0269-8811 |via=[[SAGE publications]]}}</ref> [[Tiotixene|thiothixene]],<ref>{{Citation |last=Miyazaki |first=Marissa |title=Treatment of Personality Disorders |date=2017-05-01 |url=https://psychiatryonline.org/doi/10.1176/appi.books.9781615371624.as51 |work=The American Psychiatric Association Publishing Textbook of Psychopharmacology |publisher=American Psychiatric Association Publishing |doi=10.1176/appi.books.9781615371624.as51 |isbn=978-1-58562-523-9 |access-date=2022-10-27 |last2=Simeon |first2=Daphne |last3=Hollander |first3=Eric}}</ref> and [[fluoxetine]].<ref>{{Cite journal |last=Koch |first=Jessa |last2=Modesitt |first2=Taylor |last3=Palmer |first3=Melissa |last4=Ward |first4=Sarah |last5=Martin |first5=Bobbie |last6=Wyatt |first6=Robby |last7=Thomas |first7=Christopher |date=2016 |title=Review of pharmacologic treatment in cluster A personality disorders |url=https://pubmed.ncbi.nlm.nih.gov/29955451/ |journal=The Mental Health Clinician |volume=6 |issue=2 |pages=75–81 |doi=10.9740/mhc.2016.03.75 |issn=2168-9709 |pmc=6007578 |pmid=29955451 |via=[[PubMed]]}}</ref><ref>{{Cite journal |date=1991-08-01 |title=Fluoxetine in the treatment of borderline and schizotypal personality disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/ajp.148.8.1064 |journal=American Journal of Psychiatry |volume=148 |issue=8 |pages=1064–1067 |doi=10.1176/ajp.148.8.1064 |issn=0002-953X}}</ref> While people with schizotypal personality disorder and other attenuated psychotic-spectrum disorders may have a good outcome with neuroleptics in the short term, long-term follow-up suggests significant impairment in daily functioning compared to schizotypal and even schizophrenic people without antipsychotic drug exposure.<ref>{{cite journal |vauthors=Harrow M, Jobe TH, Faull RN, Yang J |date=October 2017 |title=A 20-Year multi-followup longitudinal study assessing whether antipsychotic medications contribute to work functioning in schizophrenia |journal=Psychiatry Research |volume=256 |pages=267–274 |doi=10.1016/j.psychres.2017.06.069 |pmc=5661946 |pmid=28651219}}</ref> Positive, negative, and depressive symptoms were shown to be improved by the used of olanzapine, an antipsychotic.<ref name=":13">{{Cite journal |last=Koch |first=Jessa |last2=Modesitt |first2=Taylor |last3=Palmer |first3=Melissa |last4=Ward |first4=Sarah |last5=Martin |first5=Bobbie |last6=Wyatt |first6=Robby |last7=Thomas |first7=Christopher |date=2016-03-08 |title=Review of pharmacologic treatment in cluster A personality disorders |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6007578/ |journal=The Mental Health Clinician |volume=6 |issue=2 |pages=75–81 |doi=10.9740/mhc.2016.03.75 |issn=2168-9709 |pmc=6007578 |pmid=29955451}}</ref> Those with comorbid OCD and STPD were most positively affected by the use of [[olanzapine]], and showed worse outcomes with the use of [[clomipramine]], an antidepressant.<ref>{{Cite journal |last=Kirchner |first=Sophie K. |last2=Roeh |first2=Astrid |last3=Nolden |first3=Jana |last4=Hasan |first4=Alkomiet |date=2018-10-03 |title=Diagnosis and treatment of schizotypal personality disorder: evidence from a systematic review |url=https://www.nature.com/articles/s41537-018-0062-8 |journal=npj Schizophrenia |language=en |volume=4 |issue=1 |pages=1–18 |doi=10.1038/s41537-018-0062-8 |issn=2334-265X}}</ref> [[Antidepressants]] are also sometimes prescribed, whether for STPD proper or for comorbid anxiety and depression.<ref name="Livesley 012" /><ref>{{Cite journal |last=Kirchner |first=Sophie K. |last2=Roeh |first2=Astrid |last3=Nolden |first3=Jana |last4=Hasan |first4=Alkomiet |date=2018-10-03 |title=Diagnosis and treatment of schizotypal personality disorder: evidence from a systematic review |url=https://www.nature.com/articles/s41537-018-0062-8 |url-status=live |journal=npj Schizophrenia |language=en |volume=4 |issue=1 |pages=1–18 |doi=10.1038/s41537-018-0062-8 |issn=2334-265X |archive-url=https://web.archive.org/web/20220916015845/https://www.nature.com/articles/s41537-018-0062-8 |archive-date=October 19, 2022}}</ref> However, there is some ambiguity in the efficacy of antidepressants, as many studies have only tested people with STPD and comorbid [[Obsessive–compulsive disorder|obsessive-compulsive disorder]] or borderline personality disorder. They have shown little efficacy for treating [[dysthymia]] and [[anhedonia]] related to STPD.<ref name=":0" /> Both of these medications are the most frequently prescribed medication for STPD, though the use and efficacy of them should be evaluated differently for every case.<ref name=":13" /> The use of stimulants has also shown some efficacy, especially for those with worsened cognitive and attentional issues. Patients that suffer from concurrent psychosis should be monitored more closely if stimulants are used as part of their treatment.<ref name=":0" /> Other drugs which may be effective include [[pergolide]],<ref>{{Cite journal |last=McClure |first=Margaret M. |last2=Harvey |first2=Philip D. |last3=Goodman |first3=Marianne |last4=Triebwasser |first4=Joseph |last5=New |first5=Antonia |last6=Koenigsberg |first6=Harold W. |last7=Sprung |first7=Larry J. |last8=Flory |first8=Janine D. |last9=Siever |first9=Larry J. |date=2010 |title=Pergolide Treatment of Cognitive Deficits Associated with Schizotypal Personality Disorder: Continued Evidence of the Importance of the Dopamine System in the Schizophrenia Spectrum |url=https://www.nature.com/articles/npp20105 |journal=Neuropsychopharmacology |language=en |volume=35 |issue=6 |pages=1356–1362 |doi=10.1038/npp.2010.5 |issn=1740-634X}}</ref> [[guanfacine]],<ref>{{Cite journal |last=Graff |first=Fiona S. |last2=McClure |first2=Margaret M. |last3=Siever |first3=Larry J. |date=2014-12-01 |title=Remediation and Cognitive Enhancers in Schizotypal Personality Disorder |url=https://doi.org/10.1007/s40501-014-0027-0 |journal=Current Treatment Options in Psychiatry |language=en |volume=1 |issue=4 |pages=369–375 |doi=10.1007/s40501-014-0027-0 |issn=2196-3061}}</ref><ref name=":2">{{Cite journal |last=McClure |first=Margaret M. |last2=Graff |first2=Fiona |last3=Triebwasser |first3=Joseph |last4=Perez-Rodriguez |first4=Mercedes |last5=Rosell |first5=Daniel R. |last6=Koenigsberg |first6=Harold |last7=Hazlett |first7=Erin A. |last8=Siever |first8=Larry J. |last9=Harvey |first9=Philip D. |last10=New |first10=Antonia S. |date=2019-04-01 |title=Guanfacine Augmentation of a Combined Intervention of Computerized Cognitive Remediation Therapy and Social Skills Training for Schizotypal Personality Disorder |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.2018.18030349 |journal=American Journal of Psychiatry |volume=176 |issue=4 |pages=307–314 |doi=10.1176/appi.ajp.2018.18030349 |issn=0002-953X}}</ref><ref>{{Cite journal |last=McClure |first=Margaret M. |last2=Barch |first2=Deanna M. |last3=Romero |first3=Michelle J. |last4=Minzenberg |first4=Michael J. |last5=Triebwasser |first5=Joseph |last6=Harvey |first6=Philip D. |last7=Siever |first7=Larry J. |date=2007-05-15 |title=The Effects of Guanfacine on Context Processing Abnormalities in Schizotypal Personality Disorder |url=https://www.sciencedirect.com/science/article/pii/S000632230600864X |journal=Biological Psychiatry |series=Multiple Genotypes and Brain Development in Schizophrenia |language=en |volume=61 |issue=10 |pages=1157–1160 |doi=10.1016/j.biopsych.2006.06.034 |issn=0006-3223}}</ref><ref>{{Cite journal |last=Arnsten |first=Amy F. T. |last2=Jin |first2=Lu E. |date=2012 |title=Guanfacine for the treatment of cognitive disorders: a century of discoveries at Yale |url=https://pubmed.ncbi.nlm.nih.gov/22461743/ |journal=The Yale Journal of Biology and Medicine |volume=85 |issue=1 |pages=45–58 |issn=1551-4056 |pmc=3313539 |pmid=22461743}}</ref> and [[dihydrexidine]].<ref>{{Cite journal |last=Rosell |first=Daniel R. |last2=Zaluda |first2=Lauren C. |last3=McClure |first3=Margaret M. |last4=Perez-Rodriguez |first4=M. Mercedes |last5=Strike |first5=K. Sloan |last6=Barch |first6=Deanna M. |last7=Harvey |first7=Philip D. |last8=Girgis |first8=Ragy R. |last9=Hazlett |first9=Erin A. |last10=Mailman |first10=Richard B. |last11=Abi-Dargham |first11=Anissa |last12=Lieberman |first12=Jeffrey A. |last13=Siever |first13=Larry J. |date=2015 |title=Effects of the D1 Dopamine Receptor Agonist Dihydrexidine (DAR-0100A) on Working Memory in Schizotypal Personality Disorder |url=https://www.nature.com/articles/npp2014192 |journal=Neuropsychopharmacology |language=en |volume=40 |issue=2 |pages=446–453 |doi=10.1038/npp.2014.192 |issn=1740-634X}}</ref><ref>{{Cite journal |last=Arnsten |first=Amy F. T. |last2=Girgis |first2=Ragy R. |last3=Gray |first3=David L. |last4=Mailman |first4=Richard B. |date=2017-01-01 |title=Novel Dopamine Therapeutics for Cognitive Deficits in Schizophrenia |url=https://www.sciencedirect.com/science/article/pii/S0006322316000445 |journal=Biological Psychiatry |series=Dopamine Hypothesis of Schizophrenia |language=en |volume=81 |issue=1 |pages=67–77 |doi=10.1016/j.biopsych.2015.12.028 |issn=0006-3223}}</ref><ref>{{Cite journal |last=McClure |first=Margaret |last2=Perez-Rodriguez |first2=M Mercedes |last3=Rosell |first3=Daniel |last4=Ejebe |first4=Kenechi |last5=Siever |first5=Larry |last6=New |first6=Antonia |date=2019 |title=T38. DOPAMINE ENHANCEMENT OF VERBAL LEARNING IN THE SCHIZOPHRENIA SPECTRUM |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6455598/ |journal=Schizophrenia Bulletin |volume=45 |issue=Suppl 2 |pages=S218 |doi=10.1093/schbul/sbz019.318 |issn=0586-7614 |pmc=6455598 |via=[[PubMed]]}}</ref>


==== DSM-5 ====
=== Therapy ===
According to [[Theodore Millon]], schizotypal personality disorder is one of the easiest personality disorders to identify but one of the most difficult to treat with psychotherapy.<ref name="Millon 11">{{cite book |title=Personality disorders in modern life |vauthors=Millon T |publisher=Wiley |year=2004 |isbn=978-0-471-23734-1 |page=403 |chapter=Chapter 12 – The Schizotypal Personality |oclc=57291241 |author-link=Theodore Millon |chapter-url=http://dlia.ir/Scientific/e_book/Medicine/Internal_Medicine/RC_435_571_Psychiatry_/017437.pdf#420 |archive-url=https://web.archive.org/web/20170207112700/http://dlia.ir/Scientific/e_book/Medicine/Internal_Medicine/RC_435_571_Psychiatry_/017437.pdf |archive-date=2017-02-07}}</ref> However, it can be used as an effective form of treatment.<ref>{{Cite journal |last=Bender |first=Donna S. |last2=Dolan |first2=Regina T. |last3=Skodol |first3=Andrew E. |last4=Sanislow |first4=Charles A. |last5=Dyck |first5=Ingrid R. |last6=McGlashan |first6=Thomas H. |last7=Shea |first7=M. Tracie |last8=Zanarini |first8=Mary C. |last9=Oldham |first9=John M. |last10=Gunderson |first10=John G. |date=2001-02-01 |title=Treatment Utilization by Patients With Personality Disorders |url=https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.158.2.295 |journal=American Journal of Psychiatry |volume=158 |issue=2 |pages=295–302 |doi=10.1176/appi.ajp.158.2.295 |issn=0002-953X}}</ref> [[Cognitive remediation therapy]],<ref name=":2" /><ref>{{Cite journal |last=McGurk |first=Susan R. |date=2019-04-01 |title=Cognitive Remediation and Social Skills Training for Schizotypal Personality Disorder: Greater Gains With Guanfacine? |url=https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.2019.19020144 |journal=American Journal of Psychiatry |volume=176 |issue=4 |pages=265–266 |doi=10.1176/appi.ajp.2019.19020144 |issn=0002-953X}}</ref><ref>{{Cite journal |last=McClure |first=Margaret |last2=Graff |first2=Fiona |last3=Perez-Rodriguez |first3=Mercedes |last4=Rosell |first4=Daniel |last5=Hazlett |first5=Erin |last6=New |first6=Antonia S. |last7=Harvey |first7=Philip |last8=Siever |first8=Larry |date=2017-03-01 |title=SA25. Guanfacine Augmentation of Cognitive Remediation Therapy in the Schizophrenia Spectrum: Prospects for Improving Cognitive Performance and Functional Skills |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5475916/ |journal=Schizophrenia Bulletin |language=en |volume=43 |issue=suppl_1 |pages=S122–S122 |doi=10.1093/schbul/sbx023.024 |issn=0586-7614}}</ref> [[Metacognitive therapy]],<ref>{{Cite journal |last=Cheli |first=Simone |last2=Lysaker |first2=Paul H. |last3=Dimaggio |first3=Giancarlo |date=2019 |title=Metacognitively oriented psychotherapy for schizotypal personality disorder: A two-case series |url=https://pubmed.ncbi.nlm.nih.gov/31169366/ |journal=Personality and Mental Health |volume=13 |issue=3 |pages=155–167 |doi=10.1002/pmh.1447 |issn=1932-863X |pmid=31169366}}</ref> Supportive psychotherapy,<ref name=":6">{{Citation |last=Stone |first=Michael H. |title=Paranoid, Schizotypal, and Schizoid Personality Disorders |date=2014-05-05 |url=https://psychiatryonline.org/doi/10.1176/appi.books.9781585625048.gg68 |work=Gabbard?s Treatments of Psychiatric Disorders |publisher=American Psychiatric Publishing |doi=10.1176/appi.books.9781585625048.gg68 |isbn=978-1-58562-442-3 |access-date=2022-10-30}}</ref> [[Cognitive behavioral therapy|Cognitive-behavioral therapy]] can be effective treatments for the disorder.<ref>{{Cite journal |last=Jeppesen |first=U. N. |last2=Due |first2=A. S. |last3=Mariegaard |first3=L. |last4=Pinkham |first4=A. |last5=Vos |first5=M. |last6=Veling |first6=W. |last7=Nordentoft |first7=M. |last8=Glenthøj |first8=L. B. |date=2022-08-15 |title=Face Your Fears: Virtual reality-based cognitive behavioral therapy (VR-CBT) versus standard CBT for paranoid ideations in patients with schizophrenia spectrum disorders: a randomized clinical trial |url=https://doi.org/10.1186/s13063-022-06614-0 |journal=Trials |volume=23 |issue=1 |pages=658 |doi=10.1186/s13063-022-06614-0 |issn=1745-6215 |pmc=PMC9377061 |pmid=35971137}}</ref><ref>{{Cite journal |last=Ryan |first=Arthur |last2=Macdonald |first2=Allison |last3=Walker |first3=Elaine |date=2013 |title=The Treatment of Adolescents With Schizotypal Personality Disorder and Related Conditions: A Practice-Oriented Review of the Literature |url=http://doi.wiley.com/10.1111/cpsp.12050 |journal=Clinical Psychology: Science and Practice |language=en |volume=20 |issue=4 |pages=408–424 |doi=10.1111/cpsp.12050 |via=[[Wiley Online Library]]}}</ref> Increased social interaction with others may be able to help limit symptoms of StPD.<ref>{{Cite web |title=Effects of Environmental Enrichment at Ages 3–5 Years on Schizotypal Personality and Antisocial Behavior at Ages 17 and 23 Years |url=https://ajp.psychiatryonline.org/doi/epdf/10.1176/appi.ajp.160.9.1627 |access-date=2022-10-27 |website=ajp.psychiatryonline.org |language=en |doi=10.1176/appi.ajp.160.9.1627}}</ref> Group therapy is recommended for persons with STPD only if the group is well-structured and supportive.<ref name="Livesley 01">{{cite book | vauthors = Livesley W | title=Handbook of personality disorders : theory, research, and treatment | publisher=Guilford Press | year=2001 | isbn=978-1-57230-629-5 | oclc=45750508 }}</ref> Support is especially important for schizotypal patients with predominant [[Paranoia|paranoid]] symptoms, because they will have a lot of difficulties even in highly structured groups.<ref name="Oldham 1">{{cite book |title=The American Psychiatric Publishing textbook of personality disorders |vauthors=Oldham J, Skodol AE, Bender DS |publisher=American Psychiatric Pub |year=2005 |isbn=978-1-58562-159-0 |oclc=56733258 |author2-link=Andrew E. Skodol}}</ref> Persons with STPD usually consider themselves to be simply eccentric or nonconformist; the degree to which they consider their social nonconformity a problem differs from the degree to which it is considered a problem in psychiatry. It is difficult to gain rapport with people with STPD because increasing familiarity and intimacy usually increase their level of anxiety and discomfort.<ref>{{cite journal |vauthors=Siever LJ |year=1992 |title=Schizophrenia spectrum disorders |journal=Review of Psychiatry |volume=11 |pages=25–42}}</ref> Therapy for StPD must be flexible to face emergencies or unique challenges.<ref name=":6" />
In the [[American Psychiatric Association]]'s [[DSM-5]], schizotypal personality disorder is defined as a "pervasive pattern of social and interpersonal deficits marked by acute discomfort with, and reduced capacity for, close relationships as well as by cognitive or perceptual distortions and eccentricities of behavior, beginning by early adulthood and present in a variety of contexts."<ref name="DSM 5"/>


== Diagnosis ==
At least five of the following symptoms must be present:
* [[Ideas of reference and delusions of reference|ideas of reference]]
* strange beliefs or [[magical thinking]] that influences behavior and is inconsistent with subcultural norms (e.g., superstitiousness, belief in clairvoyance, telepathy, or "sixth sense", bizarre fantasies or preoccupations)
* abnormal perceptual experiences, including bodily illusions
* strange thinking and speech (e.g., vague, circumstantial, metaphorical, overelaborate, or stereotyped)
* inappropriate or constricted affect
* strange behavior or appearance
* excessive social anxiety that does not diminish with familiarity and tends to be associated with paranoid fears rather than negative judgments about self


=== Differential diagnosis ===
These symptoms must not occur only during the course of a disorder with similar symptoms (such as schizophrenia or [[autism spectrum]] disorder).<ref name="DSM 5">{{cite book | title=Diagnostic and statistical manual of mental disorders: DSM-5 | publisher=American Psychiatric Association, American Psychiatric Association | year=2013 | isbn=978-0-89042-555-8 | oclc=830807378 | pages=[https://archive.org/details/diagnosticstatis0005unse/page/655 655–659] | url=https://archive.org/details/diagnosticstatis0005unse/page/655 }}</ref>
{| class="wikitable"
|+
!Diagnosis
!Details
|-
|Other mental disorders with [[Psychosis|psychotic symptoms]]
|Unlike [[delusional disorder]], [[schizophrenia]], or [[Mood disorder|mood disorders]] with psychotic features, StPD is not characterized by a persistent period of psychotic symptoms. StPD symptoms must also persist when psychotic symptoms are not present.
|-
|[[Communication disorder|Communication disorders]]
|People with StPD and people with communication disorders can both have peculiar methods of communication. However, people with StPD have a greater lack of social awareness, emotional [[Reciprocity (social psychology)|reciprocity]], and stereotyped interests and behaviors.
|-
|Personality change due to another medical condition
|Symptoms similar to those of StPD can appear due to other medical conditions that affect the [[central nervous system]] or [[Substance use disorder|substance use disorders]].
|-
|Other personality disorders and personality traits
|Other personality disorders can have symptoms similar to StPD. People with Schizotypal personality disorder, [[Paranoid personality disorder]] and [[Schizoid personality disorder]] can all be socially detached and have [[Reduced affect display|blunted affects]], people with StPD have [[Cognitive distortion|cognitive]] or perceptual distortions. People with StPD and people with [[Avoidant personality disorder]] can have limited close relationships. However, people with AvPD are socially distant due to fear, rather than disinterest. Social isolation and psychotic-like symptoms can also appear in [[Borderline personality disorder]]. Although these are due to interpersonal difficulties and stress respectively, which is unlike StPD. People with StPD are usually less impulsive than people with BPD. Individuals with [[Narcissistic personality disorder]] may also appear socially alienated, however, these are due to fears having flaws noticed by others.<ref name="DSM 5">{{cite book |url=https://archive.org/details/diagnosticstatis0005unse/page/655 |title=Diagnostic and statistical manual of mental disorders : DSM-5 |publisher=American Psychiatric Association, American Psychiatric Association |year=2013 |isbn=978-0-89042-555-8 |pages=[https://archive.org/details/diagnosticstatis0005unse/page/655 655–659] |oclc=830807378}}</ref>
|}


=== Screening ===
The symptoms of "lacking close friends" and "suspiciousness or paranoia" have been used for diagnosing STPD by the DSM-V. These criteria overlap with symptoms for [[Paranoid personality disorder]] (PPD) and [[Schizoid personality disorder]] (SzPD), making these symptoms not as useful when distinguishing STPD from other personality disorders.<ref name=":2" />
There are various methods of [[Screening (medicine)|screening]] for schizotypal personality. The Schizotypal Personality Questionnaire (SPQ) measures nine traits of STPD using a [[Self-report study|self-report]] assessment.<ref>{{Cite journal |last=Barrantes-Vidal |first=Neus |last2=Grant |first2=Phillip |last3=Kwapil |first3=Thomas R. |date=2015 |title=The role of schizotypy in the study of the etiology of schizophrenia spectrum disorders |url=https://pubmed.ncbi.nlm.nih.gov/25810055/ |journal=Schizophrenia Bulletin |volume=41 Suppl 2 |pages=S408–416 |doi=10.1093/schbul/sbu191 |issn=1745-1701 |pmc=4373635 |pmid=25810055}}</ref> The nine traits referenced are Ideas of Reference, Excessive Social Anxiety, Odd Beliefs or Magical Thinking, Unusual Perceptual Experiences, Odd or Eccentric Behavior, No Close Friends, Odd Speech, Constricted Affect, and Suspiciousness. A study found that of the participants who scored in the top 10th percentile of all the SPQ scores, 55% were clinically diagnosed with STPD.<ref>{{cite journal |vauthors=Raine A |date=1991 |title=The SPQ: a scale for the assessment of schizotypal personality based on DSM-III-R criteria |journal=Schizophrenia Bulletin |volume=17 |issue=4 |pages=555–564 |doi=10.1093/schbul/17.4.555 |pmid=1805349}}</ref> It has been adapted into a computerized adaptive version, known as the SPQ-CAT.<ref>{{Cite journal |last=Moore |first=Tyler M. |last2=Calkins |first2=Monica E. |last3=Reise |first3=Steven P. |last4=Gur |first4=Ruben C. |last5=Gur |first5=Raquel E. |date=2018-05-01 |title=Development and public release of a computerized adaptive (CAT) version of the Schizotypal Personality Questionnaire |url=https://www.sciencedirect.com/science/article/pii/S0165178117315147 |journal=Psychiatry Research |language=en |volume=263 |pages=250–256 |doi=10.1016/j.psychres.2018.02.022 |issn=0165-1781}}</ref> A method that measures the risk of developing psychosis through self-reports is the Wisconsin Schizotypy Scale (WSS).<ref>{{Cite journal |vauthors=Winterstein BP, Silvia PJ, Kwapil TR, Kaufman JC, Reiter-Palmon R, Wigert |date=2011 |title=Brief assessment of schizotypy: Developing short forms of the Wisconsin Schizotypy Scales |url=https://linkinghub.elsevier.com/retrieve/pii/S0191886911003539 |journal=Personality and Individual Differences |language=en |volume=51 |issue=8 |pages=920–924 |doi=10.1016/j.paid.2011.07.027}}</ref> The WSS divides schizotypal personality traits into 4 scales for Perceptual Aberration, Magical Ideation, Revised Social Anhedonia, and Physical Anhedonia.<ref>''[http://apps.who.int/classifications/icd10/browse/2015/en#/F21 Schizotypal Disorder] {{Webarchive|url=https://web.archive.org/web/20151102042503/http://apps.who.int/classifications/icd10/browse/2015/en#/F21#/F21|date=2015-11-02}}'' in ICD-10: [https://www.who.int/classifications/icd/en/bluebook.pdf#84 Clinical descriptions and guidelines.] {{Webarchive|url=https://web.archive.org/web/20140323025330/http://www.who.int/classifications/icd/en/bluebook.pdf#84#84|date=2014-03-23}}</ref><ref name=":04">{{cite journal |vauthors=Gross GM, Mellin J, Silvia PJ, Barrantes-Vidal N, Kwapil TR |date=October 2014 |title=Comparing the factor structure of the Wisconsin Schizotypy Scales and the Schizotypal Personality Questionnaire |url=http://libres.uncg.edu/ir/uncg/f/T_Kwapil_Comparing_2014.pdf |journal=Personality Disorders |volume=5 |issue=4 |pages=397–405 |doi=10.1037/per0000090 |pmid=25314229}}</ref> A comparison of the SPQ and the WSS suggests that these measures should be cautiously used for screening of STPD.<ref name=":04" />


=== STPD as a Clinical Disorder ===
=== Comorbidities ===


* [[Antisocial personality disorder]]<ref name=":0" />
==== ICD-10 ====
* [[Bipolar disorder]]<ref>{{Cite journal |last=Correll |first=Christoph U. |last2=Smith |first2=Christopher W. |last3=Auther |first3=Andrea M. |last4=McLaughlin |first4=Danielle |last5=Shah |first5=Manoj |last6=Foley |first6=Carmel |last7=Olsen |first7=Ruth |last8=Lencz |first8=Todd |last9=Kane |first9=John M. |last10=Cornblatt |first10=Barbara A. |date=2008-10-01 |title=Predictors of Remission, Schizophrenia, and Bipolar Disorder in Adolescents with Brief Psychotic Disorder or Psychotic Disorder Not Otherwise Specified Considered At Very High Risk for Schizophrenia |url=https://www.liebertpub.com/doi/10.1089/cap.2007.110 |journal=Journal of Child and Adolescent Psychopharmacology |volume=18 |issue=5 |pages=475–490 |doi=10.1089/cap.2007.110 |issn=1044-5463}}</ref>
The [[World Health Organization]]'s [[ICD-10]] uses the name ''schizotypal disorder'' ({{ICD10|F|21||f|20}}). It is classified as a clinical disorder associated with [[schizophrenia]], rather than a [[personality disorder]] as in [[DSM-5]].<ref name="who.int">''[http://apps.who.int/classifications/icd10/browse/2015/en#/F21 Schizotypal Disorder] {{Webarchive|url=https://web.archive.org/web/20151102042503/http://apps.who.int/classifications/icd10/browse/2015/en#/F21#/F21 |date=2015-11-02 }}'' in ICD-10: [https://www.who.int/classifications/icd/en/bluebook.pdf#84 Clinical descriptions and guidelines.] {{Webarchive|url=https://web.archive.org/web/20140323025330/http://www.who.int/classifications/icd/en/bluebook.pdf#84#84 |date=2014-03-23 }}</ref>
* [[Borderline personality disorder]]<ref name="wave2">{{cite journal |display-authors=6 |vauthors=Pulay AJ, Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, Saha TD, Smith SM, Pickering RP, Ruan WJ, Hasin DS, Grant BF |date=2009 |title=Prevalence, correlates, disability, and comorbidity of DSM-IV schizotypal personality disorder: results from the wave 2 national epidemiologic survey on alcohol and related conditions |journal=Primary Care Companion to the Journal of Clinical Psychiatry |volume=11 |issue=2 |pages=53–67 |doi=10.4088/pcc.08m00679 |pmc=2707116 |pmid=19617934}}</ref>
* [[Dysthymia]]<ref name=":12">{{Cite journal |last=Pulay |first=Attila J. |last2=Stinson |first2=Frederick S. |last3=Dawson |first3=Deborah A. |last4=Goldstein |first4=Risë B. |last5=Chou |first5=S. Patricia |last6=Huang |first6=Boji |last7=Saha |first7=Tulshi D. |last8=Smith |first8=Sharon M. |last9=Pickering |first9=Roger P. |last10=Ruan |first10=W. June |last11=Hasin |first11=Deborah S. |last12=Grant |first12=Bridget F. |date=2009-04-16 |title=Prevalence, Correlates, Disability, and Comorbidity of DSM-IV Schizotypal Personality Disorder: Results From the Wave 2 National Epidemiologic Survey on Alcohol and Related Conditions |url=https://www.psychiatrist.com/pcc/personality/prevalence-correlates-disability-comorbidity-dsm-iv/ |journal=The Primary Care Companion for CNS Disorders |language=English |volume=11 |issue=2 |pages=22752 |doi=10.4088/PCC.08m00679 |issn=2155-7780}}</ref><ref name="Adams 99">{{cite book |title=Comprehensive handbook of psychopathology |vauthors=Sutker P |publisher=Kluwer Academic |year=2002 |isbn=978-0-306-46490-4 |edition=3rd |oclc=50322422}}</ref>
* [[Narcissistic personality disorder]]<ref name="wave2" />
* [[Obsessive–compulsive disorder|Obsessive-compulsive disorder]]<ref>{{Cite journal |last=Perris |first=Francesco |last2=Fabrazzo |first2=Michele |last3=De Santis |first3=Valeria |last4=Luciano |first4=Mario |last5=Sampogna |first5=Gaia |last6=Fiorillo |first6=Andrea |last7=Catapano |first7=Francesco |date=2019 |title=Comorbidity of Obsessive-Compulsive Disorder and Schizotypal Personality Disorder: Clinical Response and Treatment Resistance to Pharmacotherapy in a 3-Year Follow-Up Naturalistic Study |url=https://www.frontiersin.org/articles/10.3389/fpsyt.2019.00386 |journal=Frontiers in Psychiatry |volume=10 |doi=10.3389/fpsyt.2019.00386/full |issn=1664-0640}}</ref><ref name="Murray">{{cite book |title=Essential psychiatry |vauthors=Murray R |publisher=Cambridge University Press |year=2008 |isbn=978-0-521-60408-6 |edition=4th |oclc=298067373}}</ref><ref>{{cite journal |vauthors=Attademo L, Bernardini F |date=October 2021 |title=Schizotypal personality disorder in clinical obsessive-compulsive disorder samples: a brief overview |journal=CNS Spectrums |volume=26 |issue=5 |pages=468–480 |doi=10.1017/S1092852920001716 |pmid=32713392 |s2cid=220796175}}</ref><ref>{{Cite journal |vauthors=Fossati A, Borroni S |date=2008 |title=When 'entities' are as intrusive as obsessions: A case study of the co‐occurrence of obsessive–compulsive disorder and schizotypal personality disorder diagnoses |url=https://onlinelibrary.wiley.com/doi/10.1002/pmh.42 |journal=Personality and Mental Health |language=en |volume=2 |issue=3 |pages=192–200 |doi=10.1002/pmh.42}}</ref><ref name="wave2" /><ref>{{cite journal |vauthors=Cavanna AE, Robertson MM, Critchley HD |date=December 2007 |title=Schizotypal personality traits in Gilles de la Tourette syndrome |journal=Acta Neurologica Scandinavica |volume=116 |issue=6 |pages=385–391 |doi=10.1111/j.1600-0404.2007.00879.x |pmc=2275799 |pmid=17986097}}</ref>
* [[Major depressive disorder]]<ref name=":12" /><ref name="Adams 99" />
* [[Paranoid personality disorder]]<ref name="Tasman">{{cite book |title=Psychiatry |vauthors=Tasman A |publisher=Wiley-Blackwell |year=2008 |isbn=978-0-470-06571-6 |edition=3rd |oclc=264703257}}</ref>
* [[Post-traumatic stress disorder]]
* [[Schizoid personality disorder]]<ref name="Tasman" />
* [[Schizophrenia]]<ref>{{cite journal |vauthors=Walker E, Kestler L, Bollini A, Hochman KM |year=2004 |title=Schizophrenia: etiology and course |journal=Annual Review of Psychology |publisher=Annual Reviews |volume=55 |issue=1 |pages=401–430 |doi=10.1146/annurev.psych.55.090902.141950 |pmid=14744221}}</ref><ref>{{cite journal |vauthors=Raine A |year=2006 |title=Schizotypal personality: neurodevelopmental and psychosocial trajectories |journal=Annual Review of Clinical Psychology |volume=2 |pages=291–326 |doi=10.1146/annurev.clinpsy.2.022305.095318 |pmid=17716072}}</ref><ref>{{cite journal |vauthors=Matsui M, Sumiyoshi T, Kato K, Yoneyama E, Kurachi M |date=April 2004 |title=Neuropsychological profile in patients with schizotypal personality disorder or schizophrenia |journal=Psychological Reports |publisher=SAGE Publications |volume=94 |issue=2 |pages=387–397 |doi=10.2466/pr0.94.2.387-397 |pmid=15154161 |s2cid=41869819}}</ref><ref name="Haznedar 2004">{{cite journal |vauthors=Haznedar MM, Buchsbaum MS, Hazlett EA, Shihabuddin L, New A, Siever LJ |date=December 2004 |title=Cingulate gyrus volume and metabolism in the schizophrenia spectrum |journal=Schizophrenia Research |volume=71 |issue=2–3 |pages=249–262 |doi=10.1016/j.schres.2004.02.025 |pmid=15474896 |s2cid=28889346}}</ref>
* [[Substance use disorder|Substance use disorders]]<ref name=":12" /><ref>{{Cite journal |last=Kerridge |first=Bradley T. |last2=Saha |first2=Tulshi D. |last3=Hasin |first3=Deborah S. |date=2014 |title=DSM-IV schizotypal personality disorder: a taxometric analysis among individuals with and without substance use disorders in the general population |url=https://pubmed.ncbi.nlm.nih.gov/26322122/ |journal=Mental Health and Substance Use: Dual Diagnosis |volume=7 |issue=4 |pages=446–460 |doi=10.1080/17523281.2014.946076 |issn=1752-3281 |pmc=4549000 |pmid=26322122}}</ref>
* [[Social anxiety disorder]]<ref name="Adams 99" />


== References ==
The ICD definition is:
<references group="" responsive="1"></references>
{{cquote|A disorder characterized by eccentric behavior and anomalies of thinking and affect which resemble those seen in schizophrenia, though no definite and characteristic schizophrenic anomalies have occurred at any stage. There is no dominant or typical disturbance, but any of the following may be present:


== See also ==
* Inappropriate or constricted [[Affect (psychology)|affect]] (the individual appears cold and aloof);
{{Portal|Psychology
* Behavior or appearance that is odd, eccentric or peculiar;
}}
* Poor rapport with others and a tendency to withdraw socially;
* Odd beliefs or [[magical thinking]], influencing behavior and inconsistent with [[subcultural]] norms;
* Suspiciousness or paranoid ideas;
* Obsessive [[rumination (psychology)|rumination]]s without inner resistance;
* Unusual perceptual experiences including somatosensory (bodily) or other illusions, [[depersonalization]] or [[derealization]];
* Vague, circumstantial, metaphorical, over-elaborate or stereotyped thinking, manifested by odd speech or in other ways, without gross incoherence;
* Occasional transient quasi-psychotic episodes with intense illusions, auditory or other hallucinations and delusion-like ideas, usually occurring ''without'' external provocation.}}
{{cquote|The disorder runs a chronic course with fluctuations of intensity. Occasionally it evolves into overt schizophrenia. There is no definite onset and its evolution and course are usually those of a personality disorder. It is more common in individuals related to people with schizophrenia and is believed to be part of the genetic "spectrum" of schizophrenia.}}


* [[Boundaries of the mind]]
=== Diagnostic guidelines ===
* [[DSM-5 codes#Personality disorders|DSM-5 codes (personality disorders)]]
This diagnostic rubric is not recommended for general use because it is not clearly demarcated either from simple schizophrenia or from schizoid or paranoid personality disorders, or possibly [[autism spectrum disorder]]s as currently diagnosed. If the term is used, three or four of the typical features listed above should have been present, continuously or episodically, for at least two years. The individual must never have met criteria for schizophrenia itself. A history of schizophrenia in a first-degree relative gives additional weight to the diagnosis but is not a prerequisite.

==Treatment==
===Medication===
STPD is rarely seen as the primary reason for treatment in a clinical setting, but it often occurs as a comorbid finding with other mental disorders. When patients with STPD are prescribed pharmaceuticals, they are usually prescribed [[neuroleptics]], also known as [[Antipsychotic|antipsychotics]], of the sort used to treat [[schizophrenia]]; however, the use of neuroleptic drugs in the schizotypal population is in great doubt.<ref name="Livesley 01">{{cite book | vauthors = Livesley W | title=Handbook of personality disorders: theory, research, and treatment | publisher=Guilford Press | year=2001 | isbn=978-1-57230-629-5 | oclc=45750508 }}</ref> While people with schizotypal personality disorder and other attenuated psychotic-spectrum disorders may have a good outcome with neuroleptics in the short term, long-term follow-up suggests significant impairment in daily functioning compared to schizotypal and even schizophrenic people without neuroleptic drug exposure.<ref>{{cite journal | vauthors = Harrow M, Jobe TH, Faull RN, Yang J | title = A 20-Year multi-followup longitudinal study assessing whether antipsychotic medications contribute to work functioning in schizophrenia | journal = Psychiatry Research | volume = 256 | pages = 267–274 | date = October 2017 | pmid = 28651219 | pmc = 5661946 | doi = 10.1016/j.psychres.2017.06.069 }}</ref> Positive, negative, and depressive symptoms were shown to be improved by the used of olanzapine, a neuroleptic.<ref name=":1">{{Cite journal |last1=Koch |first1=Jessa |last2=Modesitt |first2=Taylor |last3=Palmer |first3=Melissa |last4=Ward |first4=Sarah |last5=Martin |first5=Bobbie |last6=Wyatt |first6=Robby |last7=Thomas |first7=Christopher |date=2016-03-08 |title=Review of pharmacologic treatment in cluster A personality disorders |journal=The Mental Health Clinician |volume=6 |issue=2 |pages=75–81 |doi=10.9740/mhc.2016.03.75 |issn=2168-9709 |pmc=6007578 |pmid=29955451}}</ref> Those with comorbid OCD and STPD were most positively affected by the use of [[olanzapine]], and showed worse outcomes with the use of [[clomipramine]], an antidepressant.<ref>{{Cite journal |last1=Kirchner |first1=Sophie K. |last2=Roeh |first2=Astrid |last3=Nolden |first3=Jana |last4=Hasan |first4=Alkomiet |date=2018-10-03 |title=Diagnosis and treatment of schizotypal personality disorder: evidence from a systematic review |journal=NPJ Schizophrenia |language=en |volume=4 |issue=1 |page=20 |doi=10.1038/s41537-018-0062-8 |pmid=30282970 |pmc=6170383 |issn=2334-265X}}</ref>

[[Antidepressants]] are also sometimes prescribed, whether for STPD proper or for comorbid anxiety and depression.<ref name="Livesley 01" /> However, there is some ambiguity in the efficacy of antidepressants, as many studies have only tested people with STPD and comorbid [[Obsessive–compulsive disorder|obsessive-compulsive disorder]] or borderline personality disorder. They have shown little efficacy for treating [[dysthymia]] and [[anhedonia]] related to STPD.<ref name=":2" />

Both of these medications are the most frequently prescribed medication for STPD, though the use and efficacy of them should be evaluated differently for every case.<ref name=":1" />

The use of stimulants have also shown some efficacy, especially for those with worsened cognitive and attentional issues. Patients that suffer from concurrent psychosis should be monitored more closely if stimulants are used as part of their treatment.<ref name=":2" />

===Therapy===
According to [[Theodore Millon]], schizotypal personality disorder is one of the easiest personality disorders to identify but one of the most difficult to treat with psychotherapy.<ref name="Millon 11"/> Persons with STPD usually consider themselves to be simply eccentric or nonconformist; the degree to which they consider their social nonconformity a problem differs from the degree to which it is considered a problem in psychiatry. It is difficult to gain rapport with people with STPD due to the fact that increasing familiarity and intimacy usually increase their level of anxiety and discomfort.<ref>{{cite journal| vauthors = Siever LJ |title=Schizophrenia spectrum disorders|journal=Review of Psychiatry|year=1992|volume= 11|pages =25–42}}</ref>

Group therapy is recommended for persons with STPD only if the group is well structured and supportive. Otherwise, it could lead to loose and tangential ideation.{{clarify|date=January 2021}}<ref name="Livesley 01" /> Support is especially important for schizotypal patients with predominant [[paranoia|paranoid]] symptoms, because they will have a lot of difficulties even in highly structured groups.<ref name="Oldham 1">{{cite book | vauthors = Oldham J, Skodol AE, Bender DS |author2-link=Andrew E. Skodol| title=The American Psychiatric Publishing textbook of personality disorders | publisher=American Psychiatric Pub | year=2005 | isbn=978-1-58562-159-0 | oclc=56733258 }}</ref>

==Comorbidity==
Schizotypal personality disorder frequently co-occurs with [[major depressive disorder]], [[dysthymia]] and [[social phobia]].<ref name="Adams 99">{{cite book | vauthors = Sutker P | title=Comprehensive handbook of psychopathology | publisher=Kluwer Academic | year=2002 | isbn=978-0-306-46490-4 | oclc=50322422 | edition=3rd}}</ref> Furthermore, sometimes schizotypal personality disorder can co-occur with [[obsessive–compulsive disorder]], and its presence appears to affect treatment outcome adversely.<ref name="Murray">{{cite book | vauthors = Murray R | title=Essential psychiatry | publisher=Cambridge University Press | year=2008 | isbn=978-0-521-60408-6 | oclc=298067373 | edition=4th}}</ref> Some people with a clinical diagnosis of OCD have been found to also possess many schizotypal personality traits resulting in what can be called 'schizotypal OCD'.<ref>{{cite journal | vauthors = Attademo L, Bernardini F | title = Schizotypal personality disorder in clinical obsessive-compulsive disorder samples: a brief overview | journal = CNS Spectrums | volume = 26 | issue = 5 | pages = 468–480 | date = October 2021 | pmid = 32713392 | doi = 10.1017/S1092852920001716 | s2cid = 220796175 }}</ref> Without proper treatment, STPD tendencies, such as magical thinking and paranoid ideation, could worsen the symptoms of OCD in an individual.<ref>{{Cite journal | vauthors = Fossati A, Borroni S |date=2008 |title=When 'entities' are as intrusive as obsessions: A case study of the co‐occurrence of obsessive–compulsive disorder and schizotypal personality disorder diagnoses |url=https://onlinelibrary.wiley.com/doi/10.1002/pmh.42 |journal=Personality and Mental Health |language=en |volume=2 |issue=3 |pages=192–200 |doi=10.1002/pmh.42}}</ref><ref name="wave2">{{cite journal | vauthors = Pulay AJ, Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, Saha TD, Smith SM, Pickering RP, Ruan WJ, Hasin DS, Grant BF | display-authors = 6 | title = Prevalence, correlates, disability, and comorbidity of DSM-IV schizotypal personality disorder: results from the wave 2 national epidemiologic survey on alcohol and related conditions | journal = Primary Care Companion to the Journal of Clinical Psychiatry | volume = 11 | issue = 2 | pages = 53–67 | date = 2009 | pmid = 19617934 | pmc = 2707116 | doi = 10.4088/pcc.08m00679 }}</ref><ref>{{cite journal | vauthors = Cavanna AE, Robertson MM, Critchley HD | title = Schizotypal personality traits in Gilles de la Tourette syndrome | journal = Acta Neurologica Scandinavica | volume = 116 | issue = 6 | pages = 385–391 | date = December 2007 | pmid = 17986097 | pmc = 2275799 | doi = 10.1111/j.1600-0404.2007.00879.x }}</ref>

In terms of comorbidity with other personality disorders, schizotypal personality disorder has high comorbidity with schizoid and [[paranoid personality disorder]], the other two 'Cluster A' conditions.<ref name="Tasman">{{cite book | vauthors = Tasman A | title=Psychiatry | publisher=Wiley-Blackwell | year=2008 | isbn=978-0-470-06571-6 | oclc=264703257 |edition=3rd}}</ref> Studies have found that cognitive impairment was worse in those with PPD or STPD, but the co-occurrence of the two had little impact.<ref name=":2" /> It also has significant comorbidity with borderline personality disorder and [[narcissistic personality disorder]].<ref name="wave2" />

Some schizotypal people go on to develop [[schizophrenia]],<ref>{{cite journal | vauthors = Walker E, Kestler L, Bollini A, Hochman KM | title = Schizophrenia: etiology and course | journal = Annual Review of Psychology | volume = 55 | issue = 1 | pages = 401–430 | year = 2004 | pmid = 14744221 | doi = 10.1146/annurev.psych.55.090902.141950 | publisher = Annual Reviews }}</ref> but most of them do not.<ref>{{cite journal | vauthors = Raine A | title = Schizotypal personality: neurodevelopmental and psychosocial trajectories | journal = Annual Review of Clinical Psychology | volume = 2 | pages = 291–326 | year = 2006 | pmid = 17716072 | doi = 10.1146/annurev.clinpsy.2.022305.095318 }}</ref> There are dozens of studies showing that individuals with schizotypal personality disorder score similar to individuals with schizophrenia on a very wide range of neuropsychological tests. [[Cognitive deficit]]s in patients with schizotypal personality disorder are very similar to, but quantitatively milder than, those for patients with schizophrenia.<ref>{{cite journal | vauthors = Matsui M, Sumiyoshi T, Kato K, Yoneyama E, Kurachi M | title = Neuropsychological profile in patients with schizotypal personality disorder or schizophrenia | journal = Psychological Reports | volume = 94 | issue = 2 | pages = 387–397 | date = April 2004 | pmid = 15154161 | doi = 10.2466/pr0.94.2.387-397 | publisher = SAGE Publications | s2cid = 41869819 }}</ref> A 2004 study, however, reported neurological evidence that did "not entirely support the model that SPD is simply an attenuated form of schizophrenia".<ref name="Haznedar 2004">{{cite journal | vauthors = Haznedar MM, Buchsbaum MS, Hazlett EA, Shihabuddin L, New A, Siever LJ | title = Cingulate gyrus volume and metabolism in the schizophrenia spectrum | journal = Schizophrenia Research | volume = 71 | issue = 2–3 | pages = 249–262 | date = December 2004 | pmid = 15474896 | doi = 10.1016/j.schres.2004.02.025 | s2cid = 28889346 }}</ref>

==Epidemiology==
Reported prevalence of STPD in community studies ranges from 1.37% in a [[Norway|Norwegian]] sample, to 4.6% in an [[United States|American]] sample.<ref name="DSM 5" /><ref name=":2" />A large American study found a lifetime prevalence of 3.9%, with somewhat higher rates among men (4.2%) than women (3.7%).<ref name="pulay">{{cite journal | vauthors = Pulay AJ, Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, Saha TD, Smith SM, Pickering RP, Ruan WJ, Hasin DS, Grant BF | display-authors = 6 | title = Prevalence, correlates, disability, and comorbidity of DSM-IV schizotypal personality disorder: results from the wave 2 national epidemiologic survey on alcohol and related conditions | journal = Primary Care Companion to the Journal of Clinical Psychiatry | volume = 11 | issue = 2 | pages = 53–67 | year = 2009 | pmid = 19617934 | pmc = 2707116 | doi = 10.4088/PCC.08m00679 }}</ref> It may be uncommon in clinical populations, with reported rates of up to 1.9%.<ref name="DSM 5" />

There is little known about the real world effect that STPD has on individuals. There does seem to be a relationship between STPD and not living on one's own or having a Bachelor's degree. People with STPD also seemed to be paid lower hours wages when compared to a healthy control group. The disorder also seems to be related to lack of employment, though this is specifically related to worsened cognitive impairment.<ref name=":2" />

Chance of STPD were seen highest in Black women, low socioeconomic people, and people separated from their partners, with the lowest rates in Asian men.<ref name=":2" />

Together with other [[Personality disorder#Personality clusters|cluster A]] personality disorders, it is also very common among [[Homelessness|homeless people]] who show up at drop-in centers, according to a 2008 New York study. The study did not address homeless people who do not show up at drop-in centers.<ref>{{cite journal | vauthors = Connolly AJ, Cobb-Richardson P, Ball SA | title = Personality disorders in homeless drop-in center clients | journal = Journal of Personality Disorders | volume = 22 | issue = 6 | pages = 573–588 | date = December 2008 | pmid = 19072678 | doi = 10.1521/pedi.2008.22.6.573 | url = http://www.ncsinc.org/images/pdfs/JPD_article_winter_2008.pdf | archive-url = https://web.archive.org/web/20090617134208/http://www.ncsinc.org/images/pdfs/JPD_article_winter_2008.pdf | archive-date = 2009-06-17 }}</ref>

Adolescent cannabis users have an increased likelihood of self-reporting and possessing schizotypal personality disorder or traits consistent with STPD.<ref>{{cite journal | vauthors = Davis GP, Compton MT, Wang S, Levin FR, Blanco C | title = Association between cannabis use, psychosis, and schizotypal personality disorder: findings from the National Epidemiologic Survey on Alcohol and Related Conditions | journal = Schizophrenia Research | volume = 151 | issue = 1–3 | pages = 197–202 | date = December 2013 | pmid = 24200416 | pmc = 3877688 | doi = 10.1016/j.schres.2013.10.018 }}</ref><ref>{{Cite journal |last1=Anglin |first1=Deidre M. |last2=Corcoran |first2=Cheryl M. |last3=Brown |first3=Alan S. |last4=Chen |first4=Henian |last5=Lighty |first5=Quenesha |last6=Brook |first6=Judith S. |last7=Cohen |first7=Patricia R. |date=2012-05-01 |title=Early cannabis use and Schizotypal Personality Disorder Symptoms from adolescence to middle adulthood |journal=Schizophrenia Research |language=en |volume=137 |issue=1 |pages=45–49 |doi=10.1016/j.schres.2012.01.019 |pmid=22325079 |pmc=3591468 |issn=0920-9964}}</ref> Another epidemiological study on suicidal behavior in STPD found that, even when accounted for sociodemographic factors, people with STPD were 1.51 times more likely to attempt suicide. The same study found that people with childhood adversities, specifically abuse by a parent or caretaker, have a strongly significant association with lifetime STPD.<ref>{{cite journal | vauthors = Lentz V, Robinson J, Bolton JM | title = Childhood adversity, mental disorder comorbidity, and suicidal behavior in schizotypal personality disorder | journal = The Journal of Nervous and Mental Disease | volume = 198 | issue = 11 | pages = 795–801 | date = November 2010 | pmid = 21048469 | doi = 10.1097/NMD.0b013e3181f9804c | s2cid = 205882039 }}</ref>

Schizotypal disorder is over diagnosed in [[Russia]] and other [[post-Soviet states]].<ref>Быкова А. Ю., Беккер Р. А., Быков Ю. В. О трудностях дифференциальной диагностики между первичным деперсонализационно-дереализационным расстройством и шизотипическим расстройством // Siberian Journal of Life Sciences & Agriculture. — 2022. — Т. 14. — №. 1.</ref>

== See also ==
{{Portal|Psychology}}
*[[Boundaries of the mind]]
*[[DSM-5 codes#Personality disorders|DSM-5 codes (personality disorders)]]
* [[Paranoid personality disorder]]
* [[Paranoid personality disorder]]
* [[Schizoid personality disorder]]
* [[Schizoid personality disorder]]
* [[Schizotypy]]
* [[Schizotypy]]

== References ==
{{Reflist}}


== External links ==
== External links ==
{{Medical resources|ICD10={{ICD10|F|21||f|20}}|ICD9={{ICD9|301.22}}|MeshID=D012569|MedlinePlus=001525}}{{ICD-10 personality disorders}}
{{Medical resources
| ICD10 = {{ICD10|F|21||f|20}}
| ICD9 = {{ICD9|301.22}}
| MeshID = D012569
| MedlinePlus = 001525
}}

{{ICD-10 personality disorders}}

[[Category:Paranoia]]
[[Category:Paranoia]]
[[Category:Cluster A personality disorders]]
[[Category:Cluster A personality disorders]]

Revision as of 15:23, 16 January 2023

Schizotypal personality disorder
Other namesSchizotypal disorder
A man sitting on a bench alone looking at the ocean.
People with STPD often feel isolated from society.
SpecialtyPsychiatry
SymptomsIdeas of reference, unusual beliefs, perceptual Illusions, odd thinking and speech, suspiciousness, inappropriate affect, strange behavior, lack of friends, paranoid social anxiety
ComplicationsSchizophrenia, substance use disorder, major depressive disorder
Usual onset10–20 year old
DurationLifelong
CausesGenetics; childhood neglect; childhood abuse
Risk factorsFamily history
Diagnostic methodBased on symptoms
Differential diagnosisCluster A personality disorders, borderline personality disorder, avoidant personality disorder, autism spectrum disorder, social anxiety disorder, ADHD-PI (ADD)
TreatmentCognitive-behavioral therapy, Metacognitive therapy, Cognitive remediation therapy
MedicationAntipsychotics, Antidepressants
PrognosisTypically poor, although significant improvements can be made
FrequencyEstimated 3% of general population

Schizotypal personality disorder (STPD or SPD), also known as schizotypal disorder, is a Cluster A Personality disorder.[1][2] DSM classification describes the disorder specifically as a personality disorder characterized by thought disorder, paranoia, a characteristic form of social anxiety, derealization, transient psychosis, and unconventional beliefs. People with this disorder feel pronounced discomfort in forming and maintaining social connections with other people, primarily due to the belief that other people harbor negative thoughts and views about them.[3] Peculiar speech mannerisms and socially unexpected modes of dress are also characteristic. Schizotypal people may react oddly in conversations, not respond, or talk to themselves.[3] They frequently interpret situations as being strange or having unusual meanings for them; paranormal and superstitious beliefs are common. Schizotypal people usually disagree with the suggestion their thoughts and behaviors are a 'disorder', and seek medical attention for depression or anxiety instead. Schizotypal personality disorder occurs in approximately 3% of the general population and is more commonly diagnosed in males.[4]

Epidemiology

The reported prevalence of STPD in community studies ranges from 1.37% in a Norwegian sample, to 4.6% in an American sample.[5] A large American study found a lifetime prevalence of 3.9%, with somewhat higher rates among men (4.2%) than women (3.7%).[6] It may be uncommon in clinical populations, with reported rates of up to 1.9%.[5] It has been estimated to be somewhere between 0% and 5.2% of the general population.[7] Together with other cluster A personality disorders, it is also very common among homeless people who show up at drop-in centers, according to a 2008 New York study. The study did not address homeless people who do not show up at drop-in centers.[8] Schizotypal disorder may be overdiagnosed in Russia and other post-Soviet states.[9]

Prognosis

People with StPD usually had symptoms of schizotypal personality disorder in childhood.[10] Traits of StPD usually remain consistently present over time,[11][12] although can fluctuate greatly in severity and stability.[13][14] There may be gender differences in the symptomology of men and women with Schizotypal personality disorder.[15] Women with the disorder might be more likely to have less severe cognitive deficits, and more severe social anxiety and magical thinking.[16][17][18] People with StPD are more likely to only have a high school education, to be unemployed,[19] and to have significant functional impairment.[20] The two traits of StPD which are least likely to change are paranoia and abnormal experiences.[21]

Etiology

Genetic

People who have relatives with schizotypy,[22][23][24] mood disorders,[25] or other disorders on the Schizophrenia spectrum are at a higher likelihood of developing StPD.[26][27][28] Although environmental factors likely play an important role in the onset of the disorder. The COMT Val158Met polymorphism and its Val or Met allele are suspected to be associated with Schizotypal personality disorder.[29][30][31][32] This is because these genes affect dopamine production in the brain.[33][34][35] Which is a neurochemical thought to be associated with schizotypal traits.[36][37] The gene may also contribute to decreased levels of gray matter in the prefrontal cortex.[38][39] This may lead to impaired capacities for decision-making,[40] speech,[41] cognitive flexibility,[42] and altered perceptual experiences.[43] The rs1006737 polymorphism of the CACNA1C gene is also believed to have a part in schizotypal symptoms.[44] It may lead to a significantly increased physiological response to stress through the cortisol awakening response in the brain.[45][46][47][48] It may also negatively affect reward processing in the brain and lead to anhedonia or depression in patients.[49][50] These factors possibly lead to the development of Schizotypal traits.[51] The zinc-finger protein ZNF804A likely affects the levels of paranoia, anxiety, and ideas of reference in StPD.[52][53][54] This gene is also thought to negatively impact attention in people with StPD.[55] It may lead to an increased level of white matter volume in the frontal lobe.[56] Another gene, the NOTCH4 is thought to relate to Schizophrenia spectrum disorders.[57][58] It can lead to disruptions in the occipital cortex, and therefore symptoms of schizotypy.[59] The GLRA1 and the p250GAP genes are also potentially associated with StPD.[60][61][62] It may lead to abnormally low levels of Glutamic acids in the NDMA receptors, which impairs memory and learning.[63][64][65][66] StPD may stem from abnormalities in Chromosome 22.[67][68][69]

Neurological

Exposure to influenza during week 23 of gestation is associated with a higher likelihood of developing StPD. Poor nutrition in childhood may also contribute to the onset of StPD by altering the course of brain development.[70] Numerous areas of the brain are thought to be associated with StPD. Higher levels of dopamine in the brain,[71][72] possibly specifically the D1 receptor,[73][74][75] might contribute to the development of StPD. StPD is associated with heightened dopaminergic activity in the striatum.[76][77][78][79] Their symptoms may also stem from higher presynaptic dopamine release.[80][81][82][83] People with StPD may also have decreased volumes of grey or white matter in their caudate nucleus.[84][85] Which leads to difficulties in speech.[86][87][88][89] People with StPD likely have a reduced volume in their temporal lobes,[90][91][92] possibly specifically the left hemisphere. The reduced levels of gray matter in these areas may be linked to their negative symptoms.[93] Reduced volume of gray or white matter in the superior temporal gyrus or the transverse temporal gyrus are thought to lead to issues with speech,[94][95][96][97] memory, and hallucinations.[98][99] Deficits in the gray matter volume of the temporal lobe and prefrontal cortex are likely associated with impairments in cognitive function, sensory processing, speech, executive function, decision-making, and emotional processing present in people with StPD.[100][101] StPD symptoms may also be influenced by reduced internal capsule,[102][103][104] which carries information to the cerebral cortex.[105] People with StPD can also have impairments in the uncinate fasciculus, which connects parts of the limbic system.[106]People with StPD have reduced levels of gray matter in their middle frontal gyrus and Brodmann area 10.[107] Although, not as reduced as patients with Schizophrenia.[107] Possibly preventing them from developing schizophrenia.[108] Increased gyrification in gyri by the cerebellum may lead to dysconnectivity in the brain, and therefore, schizotypal symptoms.[109][110] They may also have a hyporeactive,[111] or hyperreactive amygdala.[112] As well as hyperactive pituitary glands and putamens.[113][114] It is also possible that lower capacities for prepulse inhibition plays a role in StPD.[115][116][117][118] Research has suggested that people with StPD can have higher concentrations of Homovanillic acids.[119] Abnormalities in the cave of septum pellucidum may also be present.[120] In people predisposed to the development of Schizophrenia spectrum disorders, the consumption of cannabis can induce the onset of StPD or other disorders with psychotic symptoms.[121][122][123][124]

Environmental

Unique environmental factors, which differ from shared sibling experiences, have been found to play a role in the development of STPD and its dimensions. There is evidence to suggest that parenting styles, early separation, childhood trauma, and childhood neglect can lead to the development of schizotypal traits.[125][126][127] Neglect, abuse, stress,[128] trauma,[129][130][131] or family dysfunction during childhood may increase the risk of developing schizotypal personality disorder.[132][133][134] There is also evidence indicating that insults in the prenatal environment could affect the development of STPD.[135] Over time, children learn to interpret social cues and respond appropriately but for unknown reasons this process does not work well for people with this disorder.[136] During childhood, people with StPD may have seen little emotional expression from their parents. Another possibility is that they were excessively criticized or felt like they were constantly under threat.[137] Potentially resulting in the onset of social anxiety, strange thinking patterns,[138] and blunted affect present in StPD.[139][140][141] Their difficulties in social situations might eventually cause the individual to withdraw from most social interactions, thus leading to asociality.[142] Children with schizotypal symptoms usually are more likely to indulge in internal fantasies,[143] more anxious, socially isolated, and more sensitive to criticism.[144] People with the most severe cases of StPD usually have a combination of childhood trauma and a genetic basis for their condition.[145][146]

Signs and Symptoms

People with StPD can feel paranoid
People with StPD can have abnormal sensory experiences

Magical Thinking and Paranoia

Odd and magical thinking is common among people with StPD.[147][148][149] They are more likely to believe in supernatural phenomena and entities.[150][151][152][153] It is common for people with StPD to experience severe social anxiety and have paranoid ideation.[154][155] Ideas of reference are common in people with StPD.[156][157][158] They can feel as if expressing themselves is dangerous. They may also feel that others are more competent and have deeply entrenched and pervasive insecurities. Strange thinking patterns may be a defense mechanism against these feelings.[159] People with StPD usually have limited levels of self-awareness.[160] They may believe others think of them more negatively than they actually do.[161]

Affect

Patients with StPD can have difficulties in recognizing their or others' emotions.[162][163] This can extend to difficulties expressing emotion.[164][165] They may have limited responses to others' emotions and can be ambivalent.[166] It is common for people with StPD to derive limited joy from activities.[167][168][169] People with StPD are typically more socially isolated and disinterested in social situations than most people.[170][171][172] Although they can be socially active on the internet.[173] They can feel disconnected from themselves or others.[174][175][176][177] Depersonalization,[178][179] derealization,[180] boredom,[177] and internal fantasies are common in patients with StPD. Abnormal facial expressions are common in people with StPD. They can have aberrant eye movements and difficulty responding to stimuli.[181][182][183][184][185] Patients with StPD can also be more open to new experiences and ideas than most people.[174][186] They are more likely to abuse substances or have suicidal ideation.[187][188] Another epidemiological study on suicidal behavior in STPD found that, even when accounted for sociodemographic factors, people with STPD were 1.51 times more likely to attempt suicide.[132]

Cognitive impairments

People with StPD tend to have cognitive impairments.[189] They can have abnormal perceptional and sensory experiences such as illusions.[190][191] For example, someone with StPD might perceive colors as lighter or darker than they really are.[192] Facial perception may also be difficult for people with Schizotypal personality disorder.[193][194][195][196] They can see others as deformed, may misrecognize them, or can feel as if they are alien to them.[197] People with StPD can have difficulty processing information such as speech or language.[198][199][200] They are more likely to speak slowly, with less fluctuation in pitch,[201] and have periods of silence. Individuals with StPD may communicate with others differently .[202][203][204] Patients with StPD may have a lower odor detection threshold,[205] and can have impaired auditory or olfactory processing.[206] It is also common for people with StPD to have impaired context processing.[207][208] Which means they can form loose connections between events.[209] In addition, people with StPD can have decreased capacities for multisensory integration or contrast sensitivity.[210][211][212][213] either hyperreactive or impaired reactions to sensory input,[214][215][216] slower response times,[217] impaired attention,[218][219][220] poorer postural control,[221] and difficulties with decision-making.[222][223] People with StPD can have difficulties in memory,[224][225][226] and may have frequent intrusive memories of events.[227] It is common for people with StPD to feel Déjà vu or as if they can accurately predict future events due to abnormalities in the brain's memory storage.[228]

Treatment

Medication

Ball-and-stick model of Risperidone, a drug used to treat StPD
Model of Cognitive behavioral therapy, a type of therapy used to treat StPD

STPD is rarely seen as the primary reason for treatment in a clinical setting, but it often occurs as a comorbid finding with other mental disorders. When patients with STPD have prescribed pharmaceuticals, they are usually prescribed antipsychotics,[229][230][231] however, the use of neuroleptic drugs in the schizotypal population is in great doubt.[232] The antipsychotics which show promise as treatments for StPD are olanzapine,[233] risperidone,[234][235] haloperidol,[236] thiothixene,[237] and fluoxetine.[238][239] While people with schizotypal personality disorder and other attenuated psychotic-spectrum disorders may have a good outcome with neuroleptics in the short term, long-term follow-up suggests significant impairment in daily functioning compared to schizotypal and even schizophrenic people without antipsychotic drug exposure.[240] Positive, negative, and depressive symptoms were shown to be improved by the used of olanzapine, an antipsychotic.[241] Those with comorbid OCD and STPD were most positively affected by the use of olanzapine, and showed worse outcomes with the use of clomipramine, an antidepressant.[242] Antidepressants are also sometimes prescribed, whether for STPD proper or for comorbid anxiety and depression.[232][243] However, there is some ambiguity in the efficacy of antidepressants, as many studies have only tested people with STPD and comorbid obsessive-compulsive disorder or borderline personality disorder. They have shown little efficacy for treating dysthymia and anhedonia related to STPD.[2] Both of these medications are the most frequently prescribed medication for STPD, though the use and efficacy of them should be evaluated differently for every case.[241] The use of stimulants has also shown some efficacy, especially for those with worsened cognitive and attentional issues. Patients that suffer from concurrent psychosis should be monitored more closely if stimulants are used as part of their treatment.[2] Other drugs which may be effective include pergolide,[244] guanfacine,[245][246][247][248] and dihydrexidine.[249][250][251]

Therapy

According to Theodore Millon, schizotypal personality disorder is one of the easiest personality disorders to identify but one of the most difficult to treat with psychotherapy.[252] However, it can be used as an effective form of treatment.[253] Cognitive remediation therapy,[246][254][255] Metacognitive therapy,[256] Supportive psychotherapy,[257] Cognitive-behavioral therapy can be effective treatments for the disorder.[258][259] Increased social interaction with others may be able to help limit symptoms of StPD.[260] Group therapy is recommended for persons with STPD only if the group is well-structured and supportive.[261] Support is especially important for schizotypal patients with predominant paranoid symptoms, because they will have a lot of difficulties even in highly structured groups.[262] Persons with STPD usually consider themselves to be simply eccentric or nonconformist; the degree to which they consider their social nonconformity a problem differs from the degree to which it is considered a problem in psychiatry. It is difficult to gain rapport with people with STPD because increasing familiarity and intimacy usually increase their level of anxiety and discomfort.[263] Therapy for StPD must be flexible to face emergencies or unique challenges.[257]

Diagnosis

Differential diagnosis

Diagnosis Details
Other mental disorders with psychotic symptoms Unlike delusional disorder, schizophrenia, or mood disorders with psychotic features, StPD is not characterized by a persistent period of psychotic symptoms. StPD symptoms must also persist when psychotic symptoms are not present.
Communication disorders People with StPD and people with communication disorders can both have peculiar methods of communication. However, people with StPD have a greater lack of social awareness, emotional reciprocity, and stereotyped interests and behaviors.
Personality change due to another medical condition Symptoms similar to those of StPD can appear due to other medical conditions that affect the central nervous system or substance use disorders.
Other personality disorders and personality traits Other personality disorders can have symptoms similar to StPD. People with Schizotypal personality disorder, Paranoid personality disorder and Schizoid personality disorder can all be socially detached and have blunted affects, people with StPD have cognitive or perceptual distortions. People with StPD and people with Avoidant personality disorder can have limited close relationships. However, people with AvPD are socially distant due to fear, rather than disinterest. Social isolation and psychotic-like symptoms can also appear in Borderline personality disorder. Although these are due to interpersonal difficulties and stress respectively, which is unlike StPD. People with StPD are usually less impulsive than people with BPD. Individuals with Narcissistic personality disorder may also appear socially alienated, however, these are due to fears having flaws noticed by others.[5]

Screening

There are various methods of screening for schizotypal personality. The Schizotypal Personality Questionnaire (SPQ) measures nine traits of STPD using a self-report assessment.[264] The nine traits referenced are Ideas of Reference, Excessive Social Anxiety, Odd Beliefs or Magical Thinking, Unusual Perceptual Experiences, Odd or Eccentric Behavior, No Close Friends, Odd Speech, Constricted Affect, and Suspiciousness. A study found that of the participants who scored in the top 10th percentile of all the SPQ scores, 55% were clinically diagnosed with STPD.[265] It has been adapted into a computerized adaptive version, known as the SPQ-CAT.[266] A method that measures the risk of developing psychosis through self-reports is the Wisconsin Schizotypy Scale (WSS).[267] The WSS divides schizotypal personality traits into 4 scales for Perceptual Aberration, Magical Ideation, Revised Social Anhedonia, and Physical Anhedonia.[268][269] A comparison of the SPQ and the WSS suggests that these measures should be cautiously used for screening of STPD.[269]

Comorbidities

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See also

External links