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Autism has a strong genetic basis, although the [[Heritability of autism|genetics of autism]] are complex and it is unclear whether ASD is explained more by multigene interactions or by rare [[mutation]]s.<ref name=Abrahams/> In rare cases, autism is strongly associated with [[Teratology|agents that cause birth defects]].<ref name=Arndt/> Other proposed [[Causes of autism|causes]], such as childhood [[vaccine]]s, are [[Controversies in autism|controversial]]; the vaccine hypotheses lack convincing scientific evidence.<ref name=Rutter/> Most recent reviews estimate a [[prevalence]] of one to two cases per 1,000 people for autism, and about six per 1,000 for ASD, with ASD averaging a 4.3:1 male-to-female ratio. The number of people known to have autism has increased dramatically since the 1980s, at least partly due to changes in diagnostic practice; the question of whether actual prevalence has increased is unresolved.<ref name=Newschaffer/>
Autism has a strong genetic basis, although the [[Heritability of autism|genetics of autism]] are complex and it is unclear whether ASD is explained more by multigene interactions or by rare [[mutation]]s.<ref name=Abrahams/> In rare cases, autism is strongly associated with [[Teratology|agents that cause birth defects]].<ref name=Arndt/> Other proposed [[Causes of autism|causes]], such as childhood [[vaccine]]s, are [[Controversies in autism|controversial]]; the vaccine hypotheses lack convincing scientific evidence.<ref name=Rutter/> Most recent reviews estimate a [[prevalence]] of one to two cases per 1,000 people for autism, and about six per 1,000 for ASD, with ASD averaging a 4.3:1 male-to-female ratio. The number of people known to have autism has increased dramatically since the 1980s, at least partly due to changes in diagnostic practice; the question of whether actual prevalence has increased is unresolved.<ref name=Newschaffer/>


Autism affects many parts of the [[Human brain|brain]]; how this occurs is poorly understood. Parents usually notice signs in the first two years of their child's life. Early behavioral or cognitive intervention can help children gain self-care, social, and communication skills. There is no known cure.<ref name=CCD/> Few children with autism live independently after reaching adulthood, but some become successful,<ref name=Howlin/> and an [[Sociological and cultural aspects of autism|autistic culture]] has developed, with some seeking a cure and others believing that autism is a condition rather than a disorder.<ref name=Rajendran/>
Autism affects many parts of the [[Human brain|brain]]; how this occurs is poorly understood. Parents usually notice signs in the first two years of their child's life. Early behavioral or cognitive intervention can help children gain self-care, social, and communication skills. There is no known cure.<ref name=CCD/>Contrary to popular belief, strong numbers of children with autism live independently after reaching adulthood, and some become successful,<ref name=Howlin/> although an [[Sociological and cultural aspects of autism|autistic culture]] has developed, with some seeking a cure and others believing that autism is a condition rather than a disorder.<ref name=Rajendran/>


==Classification==
==Classification==
Line 42: Line 42:


===Social development===
===Social development===
People with autism have social impairments and often lack the intuition about others that many people take for granted. Noted autistic [[Temple Grandin]] described her inability to understand the social communication of [[neurotypical]]s as leaving her feeling "like an anthropologist on Mars".<ref>{{cite book|title=[[An Anthropologist on Mars]]: Seven Paradoxical Tales|author=[[Oliver Sacks|Sacks O]]|publisher=Knopf|date=1995|isbn=0679437851}}</ref>
People with autism could have social impairments and may sometimes lack the intuition about others that many people take for granted. Noted autistic [[Temple Grandin]] described her inability to understand the social communication of [[neurotypical]]s as leaving her feeling "like an anthropologist on Mars".<ref>{{cite book|title=[[An Anthropologist on Mars]]: Seven Paradoxical Tales|author=[[Oliver Sacks|Sacks O]]|publisher=Knopf|date=1995|isbn=0679437851}}</ref>


Social impairments become apparent early in childhood and continue through adulthood. Autistic infants show less attention to social stimuli, smile and look at others less often, and respond less to their own name. Autistic toddlers have more striking social deviance; for example, they have less [[eye contact]] and anticipatory postures and are more likely to communicate by manipulating another person's hand.<ref name=Volkmar/> Three- to five-year-old autistic children are less likely to exhibit social understanding, approach others spontaneously, imitate and respond to emotions, communicate nonverbally, and take turns with others. However, they do form [[Attachment (psychology)|attachments]] to their primary caregivers.<ref>{{cite journal|journal=Ment Retard Dev Disabil Res Rev|date=2004|volume=10|issue=4|pages=221–33|title=Early detection of core deficits in autism|author=Sigman M, Dijamco A, Gratier M, Rozga A|doi=10.1002/mrdd.20046|pmid=15666338}}</ref> They display moderately less [[Attachment in children#Secure attachment|attachment security]] than usual, although this feature disappears in children with higher mental development or less severe ASD.<ref>{{cite journal|journal=J Child Psychol Psychiatry|date=2004|volume=45|issue=6|pages=1123–34|title=Autism and attachment: a meta-analytic review|author=Rutgers AH, Bakermans-Kranenburg MJ, van IJzendoorn MH, van Berckelaer-Onnes IA|doi=10.1111/j.1469-7610.2004.t01-1-00305.x|pmid=15257669}}</ref> Older children and adults with ASD perform worse on tests of face and emotion recognition.<ref name=Sigman>{{cite journal |journal= Annu Rev Clin Psychol |year=2006 |volume=2 |pages=327–55 |title= Autism from developmental and neuropsychological perspectives |author= Sigman M, Spence SJ, Wang AT |doi=10.1146/annurev.clinpsy.2.022305.095210 |pmid=17716073}}</ref>
Social impairments become apparent early in childhood and continue through adulthood. Autistic infants show less attention to social stimuli, smile and look at others less often, and respond less to their own name. Autistic toddlers have more striking social deviance; for example, they have less [[eye contact]] and anticipatory postures and are more likely to communicate by manipulating another person's hand.<ref name=Volkmar/> Three- to five-year-old autistic children are less likely to exhibit social understanding, approach others spontaneously, imitate and respond to emotions, communicate nonverbally, and take turns with others. However, they do form [[Attachment (psychology)|attachments]] to their primary caregivers.<ref>{{cite journal|journal=Ment Retard Dev Disabil Res Rev|date=2004|volume=10|issue=4|pages=221–33|title=Early detection of core deficits in autism|author=Sigman M, Dijamco A, Gratier M, Rozga A|doi=10.1002/mrdd.20046|pmid=15666338}}</ref> They display moderately less [[Attachment in children#Secure attachment|attachment security]] than usual, although this feature disappears in children with higher mental development or less severe ASD.<ref>{{cite journal|journal=J Child Psychol Psychiatry|date=2004|volume=45|issue=6|pages=1123–34|title=Autism and attachment: a meta-analytic review|author=Rutgers AH, Bakermans-Kranenburg MJ, van IJzendoorn MH, van Berckelaer-Onnes IA|doi=10.1111/j.1469-7610.2004.t01-1-00305.x|pmid=15257669}}</ref> Older children and adults with ASD perform worse on tests of face and emotion recognition.<ref name=Sigman>{{cite journal |journal= Annu Rev Clin Psychol |year=2006 |volume=2 |pages=327–55 |title= Autism from developmental and neuropsychological perspectives |author= Sigman M, Spence SJ, Wang AT |doi=10.1146/annurev.clinpsy.2.022305.095210 |pmid=17716073}}</ref>


Contrary to common belief, autistic children do not prefer to be alone. Making and maintaining friendships often proves to be difficult for those with autism. For them, the quality of friendships, not the number of friends, predicts how lonely they are.<ref name=Burgess/>
Contrary to most common beliefs, autistic children might not prefer to be alone. Making and maintaining friendships often proves to be difficult for those with autism. For them, the quality of friendships, not the number of friends, predicts how lonely they are.<ref name=Burgess/>


There are many anecdotal reports, but few systematic studies, of aggression and violence in individuals with ASD. The limited data suggest that in children with mental retardation, autism is associated with aggression, destruction of property, and tantrums. Dominick ''et al.'' interviewed the parents of 67 children with ASD and reported that about two-thirds of the children had periods of severe tantrums and about one-third had a history of aggression, with tantrums significantly more common than in children with a history of language impairment.<ref name=Dominick/>
There are many anecdotal reports, but few systematic studies, of aggression and violence in individuals with ASD. The limited data suggest that in children with mental retardation, autism is associated with aggression, destruction of property, and tantrums. Dominick ''et al.'' interviewed the parents of 67 children with ASD and reported that about two-thirds of the children had periods of severe tantrums and about one-third had a history of aggression, with tantrums significantly more common than in children with a history of language impairment.<ref name=Dominick/>

===Autism Spectrum in Females===
Contrary to popular belief, autism studies often miss women and girls with autism, doctors are often categorizing females as bipolar, [[Multiple Personality Disorder|MPD]], schizophrenia. Making matters worse, the research on autism's four to one ratio may contain flaws or lacks of evidence or might be outdated. Studies are indicating although girls and women could be less affected by autism spectrum, if they become affected their conditions could be sometimes more severe than for males.

Research shows that girls and women with autism spectrum often hide or disguise their condition, unlike males with autistic spectrum. The female gender is different than masculine and female victims of autism spectrum disorders tend to be more softhearted and sullen than usual.

Research on autism spectrum in females is highly limited. Females are often in dilemmas regarding autism issues studying.


===Communication===
===Communication===

Revision as of 19:45, 31 July 2008

Autism spectrum
SpecialtyPsychology Edit this on Wikidata

Autism is a brain development disorder that impairs social interaction and communication and causes restricted and repetitive behavior, all starting before a child is three years old. This set of signs distinguishes autism from milder autism spectrum disorders (ASD) such as Asperger syndrome.[2]

Autism has a strong genetic basis, although the genetics of autism are complex and it is unclear whether ASD is explained more by multigene interactions or by rare mutations.[3] In rare cases, autism is strongly associated with agents that cause birth defects.[4] Other proposed causes, such as childhood vaccines, are controversial; the vaccine hypotheses lack convincing scientific evidence.[5] Most recent reviews estimate a prevalence of one to two cases per 1,000 people for autism, and about six per 1,000 for ASD, with ASD averaging a 4.3:1 male-to-female ratio. The number of people known to have autism has increased dramatically since the 1980s, at least partly due to changes in diagnostic practice; the question of whether actual prevalence has increased is unresolved.[6]

Autism affects many parts of the brain; how this occurs is poorly understood. Parents usually notice signs in the first two years of their child's life. Early behavioral or cognitive intervention can help children gain self-care, social, and communication skills. There is no known cure.[7]Contrary to popular belief, strong numbers of children with autism live independently after reaching adulthood, and some become successful,[8] although an autistic culture has developed, with some seeking a cure and others believing that autism is a condition rather than a disorder.[9]

Classification

Autism is a brain development disorder that first gives signs during infancy or childhood and generally follows a steady course without remission or relapse.[2] Impairments result from maturation-related changes in various systems of the brain.[10] Autism is one of the five pervasive developmental disorders (PDD), which are characterized by widespread abnormalities of social interactions and communication, and severely restricted interests and highly repetitive behavior.[2]

File:Asperger kl2.jpg
Hans Asperger introduced the modern sense of the word autism in 1938.[11]

Of the other four PDD forms, Asperger syndrome is closest to autism in signs and likely causes; Rett syndrome and childhood disintegrative disorder share several signs with autism, but may have unrelated causes; PDD not otherwise specified (PDD-NOS) is diagnosed when the criteria are not met for a more specific disorder.[12] Unlike autism, Asperger's has no substantial delay in language development.[13] The terminology of autism can be bewildering, with autism, Asperger's and PDD-NOS often called the autism spectrum disorders (ASD)[7] or sometimes the autistic disorders,[14] whereas autism itself is often called autistic disorder, childhood autism, or infantile autism. In this article, autism refers to the classic autistic disorder, while other sources sometimes use autism or the autisms to refer to ASD,[15] or equate ASD with PDD.[16] ASD, in turn, is a subset of the broader autism phenotype (BAP), which describes individuals who may not have ASD but do have autistic-like traits, such as avoiding eye contact.[17]

The manifestations of autism cover a wide spectrum, ranging from individuals with severe impairments—who may be silent, mentally disabled, and locked into hand flapping and rocking—to less impaired individuals who may have active but distinctly odd social approaches, narrowly focused interests, and verbose, pedantic communication.[18] Sometimes the syndrome is divided into low-, medium- and high-functioning autism (LFA, MFA, and HFA), based on IQ thresholds,[19] or on how much support the individual requires in daily life; these subdivisions are not standardized and are controversial. Autism can also be divided into syndromal and non-syndromal autism, where the former is associated with severe or profound mental retardation or a congenital syndrome with physical symptoms, such as tuberous sclerosis.[20] Although individuals with Asperger's tend to perform better cognitively than those with autism, the extent of the overlap between Asperger's, HFA, and non-syndromal autism is unclear.[21]

Some studies have reported diagnoses of autism in children due to a loss of language or social skills after 14 months of age, as opposed to a failure to make progress. Several terms are used for this phenomenon, including regressive autism, setback autism, and developmental stagnation. The validity of this distinction remains controversial; it is possible that regressive autism is a specific subtype.[22][23][24]

The inability to identify biologically meaningful subpopulations has hampered research into causes.[25] It has been proposed to classify autism using genetics as well as behavior, with the name Type 1 autism denoting rare autism cases that test positive for a mutation in the gene contactin associated protein-like 2 (CNTNAP2).[26]

Characteristics

Autism is distinguished by a pattern of symptoms rather than one single symptom. The main characteristics are impairments in social interaction, impairments in communication, restricted interests and repetitive behavior. Other aspects, such as atypical eating, are also common but are not essential for diagnosis.[27] Individual symptoms of autism occur in the general population and appear not to associate highly, without a sharp line separating pathological severity from common traits.[28]

Social development

People with autism could have social impairments and may sometimes lack the intuition about others that many people take for granted. Noted autistic Temple Grandin described her inability to understand the social communication of neurotypicals as leaving her feeling "like an anthropologist on Mars".[29]

Social impairments become apparent early in childhood and continue through adulthood. Autistic infants show less attention to social stimuli, smile and look at others less often, and respond less to their own name. Autistic toddlers have more striking social deviance; for example, they have less eye contact and anticipatory postures and are more likely to communicate by manipulating another person's hand.[24] Three- to five-year-old autistic children are less likely to exhibit social understanding, approach others spontaneously, imitate and respond to emotions, communicate nonverbally, and take turns with others. However, they do form attachments to their primary caregivers.[30] They display moderately less attachment security than usual, although this feature disappears in children with higher mental development or less severe ASD.[31] Older children and adults with ASD perform worse on tests of face and emotion recognition.[32]

Contrary to most common beliefs, autistic children might not prefer to be alone. Making and maintaining friendships often proves to be difficult for those with autism. For them, the quality of friendships, not the number of friends, predicts how lonely they are.[33]

There are many anecdotal reports, but few systematic studies, of aggression and violence in individuals with ASD. The limited data suggest that in children with mental retardation, autism is associated with aggression, destruction of property, and tantrums. Dominick et al. interviewed the parents of 67 children with ASD and reported that about two-thirds of the children had periods of severe tantrums and about one-third had a history of aggression, with tantrums significantly more common than in children with a history of language impairment.[34]

Autism Spectrum in Females

Contrary to popular belief, autism studies often miss women and girls with autism, doctors are often categorizing females as bipolar, MPD, schizophrenia. Making matters worse, the research on autism's four to one ratio may contain flaws or lacks of evidence or might be outdated. Studies are indicating although girls and women could be less affected by autism spectrum, if they become affected their conditions could be sometimes more severe than for males.

Research shows that girls and women with autism spectrum often hide or disguise their condition, unlike males with autistic spectrum. The female gender is different than masculine and female victims of autism spectrum disorders tend to be more softhearted and sullen than usual.

Research on autism spectrum in females is highly limited. Females are often in dilemmas regarding autism issues studying.

Communication

About a third to a half of individuals with autism do not develop enough natural speech to meet their daily communication needs.[35] Differences in communication may be present from the first year of life, and may include delayed onset of babbling, unusual gestures, diminished responsiveness, and the desynchronization of vocal patterns with the caregiver. In the second and third years, autistic children have less frequent and less diverse babbling, consonants, words, and word combinations; their gestures are less often integrated with words. Autistic children are less likely to make requests or share experiences, and are more likely to simply repeat others' words (echolalia)[23][36] or reverse pronouns.[37] Joint attention seems to be necessary for functional speech, and deficits in joint attention seem to distinguish infants with ASD:[1] for example, they may look at a pointing hand instead of the pointed-at object,[24][36] and they consistently fail to point at objects in order to comment on or share an experience.[1] Autistic children may have difficulty with imaginative play and with developing symbols into language.[23][36]

In a pair of studies, high-functioning autistic children aged 8–15 performed equally well, and adults better than individually matched controls at basic language tasks involving vocabulary and spelling. Both autistic groups performed worse than controls at complex language tasks such as figurative language, comprehension and inference. As people are often sized up initially from their basic language skills, these studies suggest that people speaking to autistic individuals are more likely to overestimate what their audience comprehends.[38]

Repetitive behavior

A young boy with autism, and the precise line of toys he made

Autistic individuals display many forms of repetitive or restricted behavior, which the Repetitive Behavior Scale-Revised (RBS-R)[39] categorizes as follows.

  • Stereotypy is apparently purposeless movement, such as hand flapping, head rolling, or body rocking.
  • Compulsive behavior is intended and appears to follow rules, such as arranging objects in a certain way.
  • Sameness is resistance to change; for example, insisting that the furniture not be moved or refusing to be interrupted.
  • Ritualistic behavior involves the performance of daily activities the same way each time, such as an unvarying menu or dressing ritual. This is closely associated with sameness and an independent validation has suggested combining the two factors.[40]
  • Restricted behavior is limited in focus, interest, or activity, such as preoccupation with a single television program.
  • Self-injury includes movements that injure or can injure the person, such as biting oneself. Dominick et al. reported that self-injury at some point affected about 30% of children with ASD.[34]

No single repetitive behavior seems to be specific to autism, but only autism appears to have an elevated pattern of occurrence and severity of these behaviors.[39]

Other symptoms

Autistic individuals may have symptoms that are independent of the diagnosis, but that can affect the individual or the family.[27] An estimated 0.5% to 10% of individuals with ASD show unusual abilities, ranging from splinter skills such as the memorization of trivia to the extraordinarily rare talents of prodigious autistic savants.[41]

Unusual responses to sensory stimuli are more common and prominent in autistic children, although there is no good evidence that sensory symptoms differentiate autism from other developmental disorders.[42] Differences are greater for under-responsivity (for example, walking into things) than for over-responsivity (for example, distress from loud noises) or for seeking (for example, rhythmic movements).[43] Several studies have reported associated motor problems that include poor muscle tone, poor motor planning, and toe walking; ASD is not associated with severe motor disturbances.[44]

Atypical eating behavior occurs in about three-quarters of children with ASD, to the extent that it was formerly a diagnostic indicator. Selectivity is the most common problem, although eating rituals and food refusal also occur;[34] this does not appear to result in malnutrition. Although some children with autism also have gastrointestinal (GI) symptoms, there is a lack of published rigorous data to support the theory that autistic children have more or different GI symptoms than usual;[45] studies report conflicting results, and the relationship between GI problems and ASD is unclear.[7]

Sleep problems are known to be more common in children with developmental disabilities, and there is some evidence that children with ASD are more likely to have even more sleep problems than those with other developmental disabilities; autistic children may experience problems including difficulty in falling asleep, frequent nocturnal awakenings, and early morning awakenings. Dominick et al. found that about two-thirds of children with ASD had a history of sleep problems.[34]

Parents of children with ASD have higher levels of stress.[46] Siblings of children with ASD report greater admiration of and less conflict with the affected sibling; siblings of individuals with ASD have greater risk of negative well-being and poorer sibling relationships as adults.[47]

Causes

Main article: Causes of autism
Deletion (1), duplication (2) and inversion (3) are all chromosome abnormalities that have been implicated in autism.[48]

Autism has a strong genetic basis, although the genetics of autism are complex and it is unclear whether ASD is explained more by multigene interactions or by rare mutations with major effects.[3] Early studies of twins estimated heritability explains more than 90% of the risk of autism, assuming a shared environment and no other genetic or medical syndromes.[14] However, most of the mutations that increase autism risk have not been identified. Typically, autism cannot be traced to a Mendelian (single-gene) mutation or to single chromosome abnormalities such as Angelman syndrome or fragile X syndrome, and none of the genetic syndromes associated with ASDs has been shown to selectively cause ASD.[3] There may be significant interactions among mutations in several genes, or between the environment and mutated genes. Numerous candidate genes have been located, with only small effects attributable to any particular gene.[3] The large number of autistic individuals with unaffected family members may result from copy number variations (CNVs)—spontaneous deletions or duplications in genetic material during meiosis.[49] Hence, a substantial fraction of autism may be highly heritable but not inherited: that is, the mutation that causes the autism is not present in the parental genome.[48]

All known teratogens (agents that cause birth defects) related to the risk of autism appear to act during the first eight weeks from conception, and though this does not exclude the possibility that autism can be initiated or affected later, it is strong evidence that autism arises very early in development.[4] Although evidence for other environmental causes is anecdotal and has not been confirmed by reliable studies,[5] extensive searches are underway.[50] Environmental factors that have been claimed to contribute to or exacerbate autism, or may be important in future research, include certain foods, infectious disease, heavy metals, solvents, diesel exhaust, PCBs, phthalates and phenols used in plastic products, pesticides, brominated flame retardants, alcohol, smoking, illicit drugs, vaccines,[6] and prenatal stress.[51] Although parents may first become aware of autistic symptoms in their child around the time of a routine vaccination, and parental concern about vaccines has led to a decreasing uptake of childhood immunizations and an increasing likelihood of measles outbreaks, there is overwhelming scientific evidence showing no causal association between the measles-mumps-rubella vaccine and autism, and there is no scientific evidence that the vaccine preservative thiomersal helps cause autism.[52]

Mechanism

Despite extensive investigation, how autism occurs is not well understood. Its mechanism can be divided into two areas: the pathophysiology of brain structures and processes associated with autism, and the neuropsychological linkages between brain structures and behaviors.[10] The behaviors appear to have multiple pathophysiologies.[28]

Pathophysiology

Autism affects many parts of the brain.

Autism appears to result from developmental factors that affect many or all functional brain systems,[53] and to disturb the course of brain development more than the final product.[54] Neuroanatomical studies and the associations with teratogens strongly suggest that autism's mechanism includes alteration of brain development soon after conception.[4] This localized anomaly appears to start a cascade of pathological events in the brain that are significantly influenced by environmental factors.[55] Although many major structures of the human brain have been implicated, almost all postmortem studies have been of individuals who also had mental retardation, making it difficult to draw conclusions.[54] Brain weight and volume and head circumference tend to be greater in autistic children.[56] The cellular and molecular bases of pathological early overgrowth are not known, nor is it known whether the overgrown neural systems cause autism's characteristic signs. Current hypotheses include:

Interactions between the immune system and the nervous system begin early during embryogenesis, and successful neurodevelopment depends on a balanced immune response. Several symptoms consistent with a poorly regulated immune response have been reported in autistic children. It is possible that aberrant immune activity during critical periods of neurodevelopment is part of the mechanism of some forms of ASD.[60] As autoantibodies have not been associated with pathology, are found in diseases other than ASD, and are not always present in ASD,[61] the relationship between immune disturbances and autism remains unclear and controversial.[58]

Several neurotransmitter abnormalities have been detected in autism, notably increased blood levels of serotonin. Whether these lead to structural or behavioral abnormalities is unclear.[10] Also, some inborn errors of metabolism are associated with autism but probably account for less than 5% of cases.[62]

The mirror neuron system (MNS) theory of autism hypothesizes that distortion in the development of the MNS interferes with imitation and leads to autism's core features of social impairment and communication difficulties. The MNS operates when an animal performs an action or observes another animal of the same species perform the same action. The MNS may contribute to an individual's understanding of other people by enabling the modeling of their behavior via embodied simulation of their actions, intentions, and emotions.[63] Several studies have tested this hypothesis by demonstrating structural abnormalities in MNS regions of individuals with ASD, delay in the activation in the core circuit for imitation in individuals with Asperger's, and a correlation between reduced MNS activity and severity of the syndrome in children with ASD.[64] However, individuals with autism also have abnormal brain activation in many circuits outside the MNS[65] and the MNS theory does not explain the normal performance of autistic children on imitation tasks that involve a goal or object.[66]

A 2008 study of autistic adults found evidence for altered functional organization of the task-negative network, a large-scale brain network involved in social and emotional processing, with intact organization of the task-positive network, used in sustained attention and goal-directed thinking.[67] A 2008 brain-imaging study found a specific pattern of signals in the cingulate cortex which differs in individuals with ASD.[68]

Functional magnetic resonance imaging provides some evidence for the underconnectivity theory of autism.

The underconnectivity theory of autism hypothesizes that autism is marked by underfunctioning high-level neural connections and synchronization, along with an excess of low-level processes.[69] Evidence for this theory has been found in functional neuroimaging studies on autistic individuals[38] and by a brain wave study that suggested that adults with ASD have local overconnectivity in the cortex and weak functional connections between the frontal lobe and the rest of the cortex.[70] Other evidence suggests the underconnectivity is mainly within each hemisphere of the cortex and that autism is a disorder of the association cortex.[71]

Neuropsychology

Two major categories of cognitive theories have been proposed about the links between autistic brains and behavior.

The first category focuses on deficits in social cognition. Hyper-systemizing hypothesizes that autistic individuals can systematize—that is, they can develop internal rules of operation to handle internal events—but are less effective at empathizing by handling events generated by other agents.[19] It extends the extreme male brain theory, which hypothesizes that autism is an extreme case of the male brain, defined psychometrically as individuals in whom systemizing is better than empathizing.[72] This in turn is related to the earlier theory of mind, which hypothesizes that autistic behavior arises from an inability to ascribe mental states to oneself and others. The theory of mind is supported by autistic children's atypical responses to the Sally-Anne test for reasoning about others' motivations,[73] and is mapped well from the mirror neuron system theory of autism.[64]

The second category focuses on nonsocial or general processing. Executive dysfunction hypothesizes that autistic behavior results in part from deficits in flexibility, planning, and other forms of executive function. A strength of the theory is predicting stereotyped behavior and narrow interests;[74] a weakness is that executive function deficits are not found in young autistic children.[32] Weak central coherence theory hypothesizes that a limited ability to see the big picture underlies the central disturbance in autism. One strength of this theory is predicting special talents and peaks in performance in autistic people.[75] A related theory—enhanced perceptual functioning—focuses more on the superiority of locally oriented and perceptual operations in autistic individuals.[76] These theories map well from the underconnectivity theory of autism.

Neither category is satisfactory on its own; social cognition theories poorly address autism's rigid and repetitive behaviors, while the nonsocial theories have difficulty explaining social impairment and communication difficulties.[77] A combined theory based on multiple deficits may prove to be more useful.[9]

Screening

About half of parents of children with ASD notice their child's unusual behaviors by age 18 months, and about four-fifths notice by age 24 months.[22] As postponing treatment may affect long-term outcome, any of the following signs is reason to have a child evaluated by a specialist without delay:

  • No babbling by 12 months.
  • No gesturing (pointing, waving goodbye, etc.) by 12 months.
  • No single words by 16 months.
  • No two-word spontaneous phrases (not including echolalia) by 24 months.
  • Any loss of any language or social skills, at any age.[27]

The American Academy of Pediatrics recommends that all children be screened for ASD at the 18- and 24-month well-child doctor visits, using autism-specific formal screening tests.[1] In contrast, the UK National Screening Committee recommends against screening for ASD in the general population, because screening tools have not been fully validated and interventions lack sufficient evidence for effectiveness.[78] Screening tools include the Modified Checklist for Autism in Toddlers (M-CHAT), the Early Screening of Autistic Traits Questionnaire, and the First Year Inventory; initial data on M-CHAT and its predecessor CHAT on children aged 18–30 months suggests that it is best used in a clinical setting and that it has low sensitivity (many false-negatives) but good specificity (few false-positives).[22] Screening tools designed for one culture's norms for behaviors like eye contact may be inappropriate for a different culture.[79] Genetic screening for autism is generally still impractical.[80]

Diagnosis

Diagnosis is based on behavior, not cause or mechanism.[28][81] Autism is defined in the DSM-IV-TR as exhibiting at least six symptoms total, including at least two symptoms of qualitative impairment in social interaction, at least one symptom of qualitative impairment in communication, and at least one symptom of restricted and repetitive behavior. Sample symptoms include lack of social or emotional reciprocity, stereotyped and repetitive use of language or idiosyncratic language, and persistent preoccupation with parts of objects. Onset must be prior to age three years, with delays or abnormal functioning in either social interaction, language as used in social communication, or symbolic or imaginative play. The disturbance must not be better accounted for by Rett syndrome or childhood disintegrative disorder.[82] ICD-10 uses essentially the same definition.[2]

Several diagnostic instruments are available. Two are commonly used in autism research: the Autism Diagnostic Interview-Revised (ADI-R) is a semistructured parent interview, and the Autism Diagnostic Observation Schedule (ADOS) uses observation and interaction with the child. The Childhood Autism Rating Scale (CARS) is used widely in clinical environments to assess severity of autism based on observation of children.[24]

A pediatrician commonly performs a preliminary investigation by taking developmental history and physically examining the child. If warranted, diagnosis and evaluations are conducted with help from ASD specialists, observing and assessing cognitive, communication, family, and other factors using standardized tools, and taking into account any associated medical conditions. A differential diagnosis for ASD at this stage might also consider mental retardation, hearing impairment, and a specific language impairment[83] such as Landau-Kleffner syndrome.[84] ASD can sometimes be diagnosed by age 14 months, although diagnosis becomes increasingly stable over the first three years of life: for example, a one-year-old who meets diagnostic criteria for ASD is less likely than a three-year-old to continue to do so a few years later.[22] In the UK the National Autism Plan for Children recommends at most 30 weeks from first concern to completed diagnosis and assessment, though few cases are handled that quickly in practice.[83] A 2006 U.S. study found the average age of first evaluation by a qualified professional was 48 months and of formal ASD diagnosis was 61 months, reflecting an average 13-month delay, all far above recommendations.[85]

Clinical genetics evaluations are often done once ASD is diagnosed, particularly when other symptoms already suggest a genetic cause.[86] Although genetic technology allows clinical geneticists to link an estimated 40% of cases to genetic causes,[87] consensus guidelines in the U.S. and UK are limited to high-resolution chromosome and fragile X testing.[86] As new genetic tests are developed several ethical, legal, and social issues will emerge. Commercial availability of tests may precede adequate understanding of how to use test results, given the complexity of autism's genetics.[80] Metabolic and neuroimaging tests are sometimes helpful, but are not routine.[86]

Underdiagnosis and overdiagnosis are problems in marginal cases, and much of the recent increase in the number of reported ASD cases is likely due to changes in diagnostic practices. The increasing popularity of drug treatment options and the expansion of benefits has given providers incentives to diagnose ASD, resulting in some overdiagnosis of children with uncertain symptoms. Conversely, the cost of screening and diagnosis and the challenge of obtaining payment can inhibit or delay diagnosis.[88] It is particularly hard to diagnose autism among the visually impaired, partly because some of its diagnostic criteria depend on vision, and partly because autistic symptoms overlap with those of common blindness syndromes.[89]

The symptoms of autism and ASD begin early in childhood but are occasionally missed. Adults may seek diagnoses to help them or their friends and family understand themselves, to help their employers make adjustments, or in some locations to claim disability living allowances or other benefits.[90]

Management

Main article: Autism therapies

The main goals of treatment are to lessen associated deficits and family distress, and to increase quality of life and functional independence. No single treatment is best and treatment is typically tailored to the child's needs. Intensive, sustained special education programs and behavior therapy early in life can help children acquire self-care, social, and job skills,[7] and often improve functioning and decrease symptom severity and maladaptive behaviors;[91] claims that intervention by age two to three years is crucial[92] are not substantiated.[93] Available approaches include applied behavior analysis (ABA), developmental models, structured teaching, speech and language therapy, social skills therapy, and occupational therapy.[7] Educational interventions have some effectiveness in children: intensive ABA treatment has demonstrated effectiveness in enhancing global functioning in preschool children[94] and is well-established for improving intellectual performance of young children.[91] The limited research on the effectiveness of adult residential programs shows mixed results.[95]

Many medications are used to treat problems associated with ASD.[96] More than half of U.S. children diagnosed with ASD are prescribed psychoactive drugs or anticonvulsants, with the most common drug classes being antidepressants, stimulants, and antipsychotics.[97] Aside from antipsychotics,[98] there is scant reliable research about the effectiveness or safety of drug treatments for adolescents and adults with ASD.[99] A person with ASD may respond atypically to medications, the medications can have adverse effects, and no known medication relieves autism's core symptoms of social and communication impairments.[16][100]

Although many alternative therapies and interventions are available, few are supported by scientific studies.[32][101][102] Treatment approaches have little empirical support in quality-of-life contexts, and many programs focus on success measures that lack predictive validity and real-world relevance.[33] Scientific evidence appears to matter less to service providers than program marketing, training availability, and parent requests.[103] Though most alternative treatments, such as melatonin, have only mild adverse effects[104] some may place the child at risk. A 2008 study found that compared to their peers, autistic boys have significantly thinner bones if on casein-free diets;[105] in 2005, botched chelation therapy killed a five-year-old child with autism.[106]

Treatment is expensive; indirect costs are more so. A U.S. study estimated an average cost of $3.2 million in 2003 U.S. dollars for someone born in 2000, with about 10% medical care, 30% extra education and other care, and 60% lost economic productivity.[107] Publicly supported programs are often inadequate or inappropriate for a given child, and unreimbursed out-of-pocket medical or therapy expenses are associated with likelihood of family financial problems;[108] one 2008 U.S. study found a 14% average loss of annual income in families of children with ASD,[109] and a related study found that ASD is associated with higher probability that child care problems will greatly affect parental employment.[110] After childhood, key treatment issues include residential care, job training and placement, sexuality, social skills, and estate planning.[102]

Prognosis

There is no cure.[7] Children recover occasionally, sometimes after intensive treatment and sometimes not; it is not known how often this happens.[91] Most children with autism lack social support, meaningful relationships, future employment opportunities or self-determination.[33] Although core difficulties remain, symptoms often become less severe in later childhood.[93] Few high-quality studies address long-term prognosis. Some adults show modest improvement in communication skills, but a few decline; no study has focused on autism after midlife.[111] Acquiring language before age six, having IQ above 50, and having a marketable skill all predict better outcomes; independent living is unlikely with severe autism.[112] A 2004 British study of 68 adults who were diagnosed before 1980 as autistic children with IQ above 50 found that 12% achieved a high level of independence as adults, 10% had some friends and were generally in work but required some support, 19% had some independence but were generally living at home and needed considerable support and supervision in daily living, 46% needed specialist residential provision from facilities specializing in ASD with a high level of support and very limited autonomy, and 12% needed high-level hospital care.[8] A 2005 Swedish study of 78 adults that did not exclude low IQ found worse prognosis; for example, only 4% achieved independence.[113] A 2008 Canadian study of 48 young adults diagnosed with ASD as preschoolers found outcomes ranging through poor (46%), fair (32%), good (17%), and very good (4%); only 56% had ever been employed, most in volunteer, sheltered or part time work.[114] Changes in diagnostic practice and increased availability of effective early intervention make it unclear whether these findings can be generalized to recently diagnosed children.[6]

Epidemiology

Main article: Epidemiology of autism
Reports of autism cases grew dramatically in the U.S. in 1996–2005. It is unknown how much, if any, growth came from changes in autism's prevalence.

Most recent reviews tend to estimate a prevalence of 1–2 per 1,000 for autism and close to 6 per 1,000 for ASD;[6] because of inadequate data, these numbers may underestimate ASD's true prevalence.[86] PDD-NOS is the vast majority of ASD, Asperger's is about 0.3 per 1,000 and the remaining ASD forms are much rarer.[115] The number of reported cases of autism increased dramatically in the 1990s and early 2000s. This increase is largely attributable to changes in diagnostic practices, referral patterns, availability of services, age at diagnosis, and public awareness,[116] though as-yet-unidentified contributing environmental risk factors cannot be ruled out.[5] It is unknown whether autism's prevalence increased during the same period. An increase in prevalence would suggest directing more attention and funding toward changing environmental factors instead of continuing to focus on genetics.[50]

The risk of autism is associated with several prenatal and perinatal risk factors. A 2007 review of risk factors found associated parental characteristics that included advanced maternal age, advanced paternal age, and maternal place of birth outside Europe or North America, and also found associated obstetric conditions that included low birth weight and gestation duration, and hypoxia during childbirth.[117]

Autism is associated with several other conditions:

  • Genetic disorders. About 10–15% of autism cases have an identifiable Mendelian (single-gene) condition, chromosome abnormality, or other genetic syndrome,[118] and ASD is associated with several genetic disorders.[119]
  • Mental retardation. The fraction of autistic individuals who also meet criteria for mental retardation has been reported as anywhere from 25% to 70%, a wide variation illustrating the difficulty of assessing autistic intelligence.[120] For ASD other than autism the association with mental retardation is much weaker.[121]
  • Maleness. Boys are at higher risk for autism than girls. The ASD sex ratio averages 4.3:1 and is greatly modified by cognitive impairment: it may be close to 2:1 with mental retardation and more than 5.5:1 without.[6]
  • Epilepsy, with variations in risk of epilepsy due to age, cognitive level, and type of language disorder.[122]
  • Several metabolic defects, such as phenylketonuria, are associated with autistic symptoms.[62]
  • Minor physical anomalies are significantly increased in the autistic population.[123]
  • Preempted diagnoses. Although the DSM-IV rules out concurrent diagnosis of many other conditions along with autism, the full criteria for ADHD, Tourette syndrome, and other of these conditions are often present and these comorbid diagnoses are increasingly accepted.[124]

History

See also: Sociological and cultural aspects of autism

A few examples of autistic symptoms and treatments were described long before autism was named. The Table Talk of Martin Luther contains a story of a 12-year-old boy who may have been severely autistic.[125] According to Luther's notetaker Mathesius, Luther thought the boy was a soulless mass of flesh possessed by the devil, and suggested that he be suffocated.[126] Victor of Aveyron, a feral child caught in 1798, showed several signs of autism; the medical student Jean Itard treated him with a behavioral program designed to help him form social attachments and to induce speech via imitation.[127]

The New Latin word autismus (English translation autism) was coined by the Swiss psychiatrist Eugen Bleuler in 1910 as he was defining symptoms of schizophrenia. He derived it from the Greek word autos (αὐτός, meaning self), and used it to mean morbid self-admiration, referring to "autistic withdrawal of the patient to his fantasies, against which any influence from outside becomes an intolerable disturbance."[128]

File:Kanner kl2.jpg
Leo Kanner introduced the label early infantile autism in 1943.

The word autism first took its modern sense in 1938 when Hans Asperger of the Vienna University Hospital adopted Bleuler's terminology "autistic psychopaths" in a lecture in German about child psychology.[129] Asperger was investigating a form of ASD now known as Asperger syndrome, though for various reasons it was not widely recognized as a separate diagnosis until 1981.[127] Leo Kanner of the Johns Hopkins Hospital first used autism in its modern sense in English when he introduced the label early infantile autism in a 1943 report of 11 children with striking behavioral similarities.[37] Almost all the characteristics described in Kanner's first paper on the subject, notably "autistic aloneness" and "insistence on sameness", are still regarded as typical of the autistic spectrum of disorders.[77] It is not known whether Kanner derived the term independently of Asperger.[11]

Kanner's reuse of autism led to decades of confused terminology like "infantile schizophrenia", and child psychiatry's focus on maternal deprivation during the mid-1900s led to misconceptions of autism as an infant's response to "refrigerator mothers". Starting in the late 1960s autism was established as a separate syndrome by demonstrating that it is lifelong, distinguishing it from mental retardation and schizophrenia and from other developmental disorders, and demonstrating the benefits of involving parents in active programs of therapy.[130] As late as the mid-1970s there was little evidence of a genetic role in autism; now it is thought to be one of the most heritable of all psychiatric conditions.[131] Although the rise of parent organizations and the destigmatization of childhood ASD have deeply affected how we view ASD,[127] parents continue to feel social stigma in situations where their autistic children's behaviors are perceived negatively by others,[132] and many primary care physicians and medical specialists still express some beliefs consistent with outdated autism research.[133] The Internet has helped autistic individuals bypass nonverbal cues and emotional sharing that they find so hard to deal with, and has given them a way to form online communities and work remotely.[134] Sociological and cultural aspects of autism have developed: some in the community seek a cure, while others believe that autism is simply another way of being.[9][135]

References

  1. ^ a b c d Johnson CP, Myers SM, Council on Children with Disabilities (2007). "Identification and evaluation of children with autism spectrum disorders". Pediatrics. 120 (5): 1183–215. doi:10.1542/peds.2007-2361. PMID 17967920. {{cite journal}}: Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)CS1 maint: multiple names: authors list (link)
  2. ^ a b c d World Health Organization (2006). "F84. Pervasive developmental disorders". International Statistical Classification of Diseases and Related Health Problems (10th ed. (ICD-10) ed.). {{cite book}}: |access-date= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
  3. ^ a b c d Abrahams BS, Geschwind DH (2008). "Advances in autism genetics: on the threshold of a new neurobiology". Nat Rev Genet. 9 (5): 341–55. doi:10.1038/nrg2346. PMID 18414403.
  4. ^ a b c Arndt TL, Stodgell CJ, Rodier PM (2005). "The teratology of autism". Int J Dev Neurosci. 23 (2–3): 189–99. doi:10.1016/j.ijdevneu.2004.11.001. PMID 15749245.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. ^ a b c Rutter M (2005). "Incidence of autism spectrum disorders: changes over time and their meaning". Acta Paediatr. 94 (1): 2–15. doi:10.1080/08035250410023124. PMID 15858952.
  6. ^ a b c d e Newschaffer CJ, Croen LA, Daniels J; et al. (2007). "The epidemiology of autism spectrum disorders". Annu Rev Public Health. 28: 235–58. doi:10.1146/annurev.publhealth.28.021406.144007. PMID 17367287. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  7. ^ a b c d e f Myers SM, Johnson CP, Council on Children with Disabilities (2007). "Management of children with autism spectrum disorders". Pediatrics. 120 (5): 1162–82. doi:10.1542/peds.2007-2362. PMID 17967921. {{cite journal}}: Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)CS1 maint: multiple names: authors list (link)
  8. ^ a b Howlin P, Goode S, Hutton J, Rutter M (2004). "Adult outcome for children with autism". J Child Psychol Psychiatry. 45 (2): 212–29. doi:10.1111/j.1469-7610.2004.00215.x. PMID 14982237.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  9. ^ a b c Rajendran G, Mitchell P (2007). "Cognitive theories of autism". Dev Rev. 27 (2): 224–60. doi:10.1016/j.dr.2007.02.001.
  10. ^ a b c Penn HE (2006). "Neurobiological correlates of autism: a review of recent research". Child Neuropsychol. 12 (1): 57–79. doi:10.1080/09297040500253546. PMID 16484102.
  11. ^ a b Lyons V, Fitzgerald M (2007). "Asperger (1906–1980) and Kanner (1894–1981), the two pioneers of autism". J Autism Dev Disord. 37 (10): 2022–3. doi:10.1007/s10803-007-0383-3. PMID 17922179.
  12. ^ Lord C, Cook EH, Leventhal BL, Amaral DG (2000). "Autism spectrum disorders". Neuron. 28 (2): 355–63. doi:10.1016/S0896-6273(00)00115-X. PMID 11144346.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ American Psychiatric Association (2000). "Diagnostic criteria for 299.80 Asperger's Disorder". Diagnostic and Statistical Manual of Mental Disorders (4th ed., text revision (DSM-IV-TR) ed.). ISBN 0890420254. {{cite book}}: External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
  14. ^ a b Freitag CM (2007). "The genetics of autistic disorders and its clinical relevance: a review of the literature". Mol Psychiatry. 12 (1): 2–22. doi:10.1038/sj.mp.4001896. PMID 17033636.
  15. ^ Geschwind DH, Levitt P (2007). "Autism spectrum disorders: developmental disconnection syndromes". Curr Opin Neurobiol. 17 (1): 103–11. doi:10.1016/j.conb.2007.01.009. PMID 17275283.
  16. ^ a b Strock M (2008). "Autism spectrum disorders (pervasive developmental disorders)". National Institute of Mental Health. Retrieved 2008-03-24. {{cite journal}}: Cite journal requires |journal= (help)
  17. ^ Piven J, Palmer P, Jacobi D, Childress D, Arndt S (1997). "Broader autism phenotype: evidence from a family history study of multiple-incidence autism families" (PDF). Am J Psychiatry. 154 (2): 185–90. PMID 9016266.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  18. ^ Happé F (1999). "Understanding assets and deficits in autism: why success is more interesting than failure" (PDF). Psychologist. 12 (11): 540–7.
  19. ^ a b Baron-Cohen S (2006). "The hyper-systemizing, assortative mating theory of autism". Prog Neuropsychopharmacol Biol Psychiatry. 30 (5): 865–72. doi:10.1016/j.pnpbp.2006.01.010. PMID 16519981.
  20. ^ Cohen D, Pichard N, Tordjman S; et al. (2005). "Specific genetic disorders and autism: clinical contribution towards their identification". J Autism Dev Disord. 35 (1): 103–16. doi:10.1007/s10803-004-1038-2. PMID 15796126. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  21. ^ Validity of ASD subtypes:
  22. ^ a b c d Landa RJ (2008). "Diagnosis of autism spectrum disorders in the first 3 years of life". Nat Clin Pract Neurol. 4 (3): 138–47. doi:10.1038/ncpneuro0731. PMID 18253102.
  23. ^ a b c Landa R (2007). "Early communication development and intervention for children with autism". Ment Retard Dev Disabil Res Rev. 13 (1): 16–25. doi:10.1002/mrdd.20134. PMID 17326115.
  24. ^ a b c d Volkmar F, Chawarska K, Klin A (2005). "Autism in infancy and early childhood". Annu Rev Psychol. 56: 315–36. doi:10.1146/annurev.psych.56.091103.070159. PMID 15709938.{{cite journal}}: CS1 maint: multiple names: authors list (link) A partial update is in: Volkmar FR, Chawarska K (2008). "Autism in infants: an update". World Psychiatry. 7 (1): 19–21. PMC 2366821. PMID 18458791.
  25. ^ Altevogt BM, Hanson SL, Leshner AI (2008). "Autism and the environment: challenges and opportunities for research". Pediatrics. 121 (6): 1225–9. doi:10.1542/peds.2007-3000. PMID 18519493.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  26. ^ Stephan DA (2008). "Unraveling autism". Am J Hum Genet. 82 (1): 7–9. doi:10.1016/j.ajhg.2007.12.003. PMID 18179879.
  27. ^ a b c Filipek PA, Accardo PJ, Baranek GT; et al. (1999). "The screening and diagnosis of autistic spectrum disorders". J Autism Dev Disord. 29 (6): 439–84. doi:10.1023/A:1021943802493. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link) "Erratum". J Autism Dev Disord. 30 (1): 81. 2000. doi:10.1023/A:1017256313409. PMID 10638459. {{cite journal}}: Unknown parameter |quotes= ignored (help) This paper represents a consensus of representatives from nine professional and four parent organizations in the U.S.
  28. ^ a b c London E (2007). "The role of the neurobiologist in redefining the diagnosis of autism". Brain Pathol. 17 (4): 408–11. doi:10.1111/j.1750-3639.2007.00103.x. PMID 17919126.
  29. ^ Sacks O (1995). An Anthropologist on Mars: Seven Paradoxical Tales. Knopf. ISBN 0679437851.
  30. ^ Sigman M, Dijamco A, Gratier M, Rozga A (2004). "Early detection of core deficits in autism". Ment Retard Dev Disabil Res Rev. 10 (4): 221–33. doi:10.1002/mrdd.20046. PMID 15666338.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  31. ^ Rutgers AH, Bakermans-Kranenburg MJ, van IJzendoorn MH, van Berckelaer-Onnes IA (2004). "Autism and attachment: a meta-analytic review". J Child Psychol Psychiatry. 45 (6): 1123–34. doi:10.1111/j.1469-7610.2004.t01-1-00305.x. PMID 15257669.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  32. ^ a b c Sigman M, Spence SJ, Wang AT (2006). "Autism from developmental and neuropsychological perspectives". Annu Rev Clin Psychol. 2: 327–55. doi:10.1146/annurev.clinpsy.2.022305.095210. PMID 17716073.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  33. ^ a b c Burgess AF, Gutstein SE (2007). "Quality of life for people with autism: raising the standard for evaluating successful outcomes". Child Adolesc Ment Health. 12 (2): 80–6. doi:10.1111/j.1475-3588.2006.00432.x.
  34. ^ a b c d Dominick KC, Davis NO, Lainhart J, Tager-Flusberg H, Folstein S (2007). "Atypical behaviors in children with autism and children with a history of language impairment". Res Dev Disabil. 28 (2): 145–62. doi:10.1016/j.ridd.2006.02.003. PMID 16581226.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  35. ^ Noens I, van Berckelaer-Onnes I, Verpoorten R, van Duijn G (2006). "The ComFor: an instrument for the indication of augmentative communication in people with autism and intellectual disability". J Intellect Disabil Res. 50 (9): 621–32. doi:10.1111/j.1365-2788.2006.00807.x. PMID 16901289.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  36. ^ a b c Tager-Flusberg H, Caronna E (2007). "Language disorders: autism and other pervasive developmental disorders". Pediatr Clin North Am. 54 (3): 469–81. doi:10.1016/j.pcl.2007.02.011. PMID 17543905.
  37. ^ a b Kanner L (1943). "Autistic disturbances of affective contact". Nerv Child. 2: 217–50. "Reprint". Acta Paedopsychiatr. 35 (4): 100–36. 1968. PMID 4880460. {{cite journal}}: Unknown parameter |quotes= ignored (help)
  38. ^ a b Williams DL, Goldstein G, Minshew NJ (2006). "Neuropsychologic functioning in children with autism: further evidence for disordered complex information-processing". Child Neuropsychol. 12 (4–5): 279–98. doi:10.1080/09297040600681190. PMC 1803025. PMID 16911973.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  39. ^ a b Bodfish JW, Symons FJ, Parker DE, Lewis MH (2000). "Varieties of repetitive behavior in autism: comparisons to mental retardation". J Autism Dev Disord. 30 (3): 237–43. doi:10.1023/A:1005596502855. PMID 11055459.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  40. ^ Lam KSL, Aman MG (2007). "The Repetitive Behavior Scale-Revised: independent validation in individuals with autism spectrum disorders". J Autism Dev Disord. 37 (5): 855–66. doi:10.1007/s10803-006-0213-z. PMID 17048092.
  41. ^ Treffert DA (2006). "Savant syndrome: an extraordinary condition—a synopsis: past, present, future". Wisconsin Medical Society. Retrieved 2008-03-24.
  42. ^ Rogers SJ, Ozonoff S (2005). "Annotation: what do we know about sensory dysfunction in autism? A critical review of the empirical evidence". J Child Psychol Psychiatry. 46 (12): 1255–68. doi:10.1111/j.1469-7610.2005.01431.x. PMID 16313426.
  43. ^ Ben-Sasson A, Hen L, Fluss R, Cermak SA, Engel-Yeger B, Gal E (2008). "A meta-analysis of sensory modulation symptoms in individuals with autism spectrum disorders". J Autism Dev Disord. doi:10.1007/s10803-008-0593-3. PMID 18512135.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  44. ^ Ming X, Brimacombe M, Wagner GC (2007). "Prevalence of motor impairment in autism spectrum disorders". Brain Dev. 29 (9): 565–70. doi:10.1016/j.braindev.2007.03.002. PMID 17467940.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  45. ^ Erickson CA, Stigler KA, Corkins MR, Posey DJ, Fitzgerald JF, McDougle CJ (2005). "Gastrointestinal factors in autistic disorder: a critical review". J Autism Dev Disord. 35 (6): 713–27. doi:10.1007/s10803-005-0019-4. PMID 16267642.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  46. ^ Montes G, Halterman JS (2007). "Psychological functioning and coping among mothers of children with autism: a population-based study". Pediatrics. 119 (5): e1040–6. doi:10.1542/peds.2006-2819. PMID 17473077.
  47. ^ Orsmond GI, Seltzer MM (2007). "Siblings of individuals with autism spectrum disorders across the life course" (PDF). Ment Retard Dev Disabil Res Rev. 13 (4): 313–20. doi:10.1002/mrdd.20171. PMID 17979200. Retrieved 2008-04-17.
  48. ^ a b Beaudet AL (2007). "Autism: highly heritable but not inherited". Nat Med. 13 (5): 534–6. doi:10.1038/nm0507-534. PMID 17479094.
  49. ^ Sebat J, Lakshmi B, Malhotra D; et al. (2007). "Strong association of de novo copy number mutations with autism". Science. 316 (5823): 445–9. doi:10.1126/science.1138659. PMID 17363630. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  50. ^ a b Szpir M (2006). "Tracing the origins of autism: a spectrum of new studies". Environ Health Perspect. 114 (7): A412–8. PMID 16835042.
  51. ^ Kinney DK, Munir KM, Crowley DJ, Miller AM (2008). "Prenatal stress and risk for autism". Neurosci Biobehav Rev. doi:10.1016/j.neubiorev.2008.06.004. PMID 18598714.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  52. ^ Vaccines and autism:
    • Doja A, Roberts W (2006). "Immunizations and autism: a review of the literature". Can J Neurol Sci. 33 (4): 341–6. PMID 17168158.
    • Taylor B (2006). "Vaccines and the changing epidemiology of autism". Child Care Health Dev. 32 (5): 511–9. doi:10.1111/j.1365-2214.2006.00655.x. PMID 16919130.
  53. ^ Müller RA (2007). "The study of autism as a distributed disorder". Ment Retard Dev Disabil Res Rev. 13 (1): 85–95. doi:10.1002/mrdd.20141. PMID 17326118.
  54. ^ a b Amaral DG, Schumann CM, Nordahl CW (2008). "Neuroanatomy of autism". Trends Neurosci. 31 (3): 137–45. doi:10.1016/j.tins.2007.12.005. PMID 18258309.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  55. ^ Casanova MF (2007). "The neuropathology of autism". Brain Pathol. 17 (4): 422–33. doi:10.1111/j.1750-3639.2007.00100.x. PMID 17919128.
  56. ^ DiCicco-Bloom E, Lord C, Zwaigenbaum L; et al. (2006). "The developmental neurobiology of autism spectrum disorder". J Neurosci. 26 (26): 6897–906. doi:10.1523/JNEUROSCI.1712-06.2006. PMID 16807320. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  57. ^ Courchesne E, Pierce K, Schumann CM; et al. (2007). "Mapping early brain development in autism". Neuron. 56 (2): 399–413. doi:10.1016/j.neuron.2007.10.016. PMID 17964254. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  58. ^ a b Schmitz C, Rezaie P (2008). "The neuropathology of autism: where do we stand?". Neuropathol Appl Neurobiol. 34 (1): 4–11. doi:10.1111/j.1365-2990.2007.00872.x. PMID 17971078.
  59. ^ a b c Persico AM, Bourgeron T (2006). "Searching for ways out of the autism maze: genetic, epigenetic and environmental clues". Trends Neurosci. 29 (7): 349–58. doi:10.1016/j.tins.2006.05.010. PMID 16808981.
  60. ^ Ashwood P, Wills S, Van de Water J (2006). "The immune response in autism: a new frontier for autism research". J Leukoc Biol. 80 (1): 1–15. doi:10.1189/jlb.1205707. PMID 16698940.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  61. ^ Wills S, Cabanlit M, Bennett J, Ashwood P, Amaral D, Van de Water J (2007). "Autoantibodies in autism spectrum disorders (ASD)". Ann N Y Acad Sci. 1107: 79–91. doi:10.1196/annals.1381.009. PMID 17804535.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  62. ^ a b Manzi B, Loizzo AL, Giana G, Curatolo P (2008). "Autism and metabolic diseases". J Child Neurol. 23 (3): 307–14. doi:10.1177/0883073807308698. PMID 18079313.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  63. ^ MNS and autism:
  64. ^ a b Iacoboni M, Dapretto M (2006). "The mirror neuron system and the consequences of its dysfunction". Nat Rev Neurosci. 7 (12): 942–51. doi:10.1038/nrn2024. PMID 17115076.
  65. ^ Frith U, Frith CD (2003). "Development and neurophysiology of mentalizing" (PDF). Philos Trans R Soc Lond B Biol Sci. 358 (1431): 459–73. doi:10.1098/rstb.2002.1218. PMID 12689373.
  66. ^ Hamilton AFdC (2008). "Emulation and mimicry for social interaction: a theoretical approach to imitation in autism". Q J Exp Psychol. 61 (1): 101–15. doi:10.1080/17470210701508798. PMID 18038342.
  67. ^ Kennedy DP, Courchesne E (2008). "The intrinsic functional organization of the brain is altered in autism". Neuroimage. 38 (4): 1877–85. doi:10.1016/j.neuroimage.2007.10.052. PMID 18083565.
  68. ^ Chiu PH, Kayali MA, Kishida KT; et al. (2008). "Self responses along cingulate cortex reveal quantitative neural phenotype for high-functioning autism". Neuron. 57 (3): 463–73. doi:10.1016/j.neuron.2007.12.020. PMID 18255038. {{cite journal}}: Explicit use of et al. in: |author= (help); Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)CS1 maint: multiple names: authors list (link)
  69. ^ Just MA, Cherkassky VL, Keller TA, Kana RK, Minshew NJ (2007). "Functional and anatomical cortical underconnectivity in autism: evidence from an FMRI study of an executive function task and corpus callosum morphometry". Cereb Cortex. 17 (4): 951–61. doi:10.1093/cercor/bhl006. PMID 16772313.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  70. ^ Murias M, Webb SJ, Greenson J, Dawson G (2007). "Resting state cortical connectivity reflected in EEG coherence in individuals with autism". Biol Psychiatry. 62 (3): 270–3. doi:10.1016/j.biopsych.2006.11.012. PMID 17336944.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  71. ^ Minshew NJ, Williams DL (2007). "The new neurobiology of autism: cortex, connectivity, and neuronal organization". Arch Neurol. 64 (7): 945–50. doi:10.1001/archneur.64.7.945. PMID 17620483.
  72. ^ Baron-Cohen S (2002). "The extreme male brain theory of autism". Trends Cogn Sci. 6 (6): 248–54. doi:10.1016/S1364-6613(02)01904-6. PMID 12039606.
  73. ^ Baron-Cohen S, Leslie AM, Frith U (1985). "Does the autistic child have a 'theory of mind'?" (PDF). Cognition. 21 (1): 37–46. doi:10.1016/0010-0277(85)90022-8. PMID 2934210. Retrieved 2007-06-28.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  74. ^ Hill EL (2004). "Executive dysfunction in autism". Trends Cogn Sci. 8 (1): 26–32. doi:10.1016/j.dr.2004.01.001. PMID 14697400.
  75. ^ Happé F, Frith U (2006). "The weak coherence account: detail-focused cognitive style in autism spectrum disorders". J Autism Dev Disord. 36 (1): 5–25. doi:10.1007/s10803-005-0039-0. PMID 16450045.
  76. ^ Mottron L, Dawson M, Soulières I, Hubert B, Burack J (2006). "Enhanced perceptual functioning in autism: an update, and eight principles of autistic perception". J Autism Dev Disord. 36 (1): 27–43. doi:10.1007/s10803-005-0040-7. PMID 16453071.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  77. ^ a b Happé F, Ronald A, Plomin R (2006). "Time to give up on a single explanation for autism". Nat Neurosci. 9 (10): 1218–20. doi:10.1038/nn1770. PMID 17001340.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  78. ^ Williams J, Brayne C (2006). "Screening for autism spectrum disorders: what is the evidence?". Autism. 10 (1): 11–35. doi:10.1177/1362361306057876. PMID 16522708.
  79. ^ Wallis KE, Pinto-Martin J (2008). "The challenge of screening for autism spectrum disorder in a culturally diverse society". Acta Paediatr. 97 (5): 539–40. doi:10.1111/j.1651-2227.2008.00720.x. PMID 18373717.
  80. ^ a b McMahon WM, Baty BJ, Botkin J (2006). "Genetic counseling and ethical issues for autism". Am J Med Genet C Semin Med Genet. 142C (1): 52–7. doi:10.1002/ajmg.c.30082. PMID 16419100.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  81. ^ Baird G, Cass H, Slonims V (2003). "Diagnosis of autism". BMJ. 327 (7413): 488–93. doi:10.1136/bmj.327.7413.488. PMID 12946972.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  82. ^ American Psychiatric Association (2000). "Diagnostic criteria for 299.00 Autistic Disorder". Diagnostic and Statistical Manual of Mental Disorders (4th ed., text revision (DSM-IV-TR) ed.). ISBN 0890420254. {{cite book}}: |access-date= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
  83. ^ a b Dover CJ, Le Couteur A (2007). "How to diagnose autism". Arch Dis Child. 92 (6): 540–5. doi:10.1136/adc.2005.086280. PMID 17515625.
  84. ^ Mantovani JF (2000). "Autistic regression and Landau-Kleffner syndrome: progress or confusion?". Dev Med Child Neurol. 42 (5): 349–53. doi:10.1111/j.1469-8749.2000.tb00104.x. PMID 10855658. {{cite journal}}: Unknown parameter |doi_brokendate= ignored (|doi-broken-date= suggested) (help)
  85. ^ Wiggins LD, Baio J, Rice C (2006). "Examination of the time between first evaluation and first autism spectrum diagnosis in a population-based sample". J Dev Behav Pediatr. 27 (2 Suppl): S79–87. doi:10.1097/00004703-200604002-00005. PMID 16685189.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  86. ^ a b c d Caronna EB, Milunsky JM, Tager-Flusberg H (2008). "Autism spectrum disorders: clinical and research frontiers". Arch Dis Child. 93 (6): 518–23. doi:10.1136/adc.2006.115337. PMID 18305076.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  87. ^ Schaefer GB, Mendelsohn NJ (2008). "Genetics evaluation for the etiologic diagnosis of autism spectrum disorders". Genet Med. 10 (1): 4–12. doi:10.1097/GIM.0b013e31815efdd7. PMID 18197051. {{cite journal}}: Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)
  88. ^ Shattuck PT, Grosse SD (2007). "Issues related to the diagnosis and treatment of autism spectrum disorders". Ment Retard Dev Disabil Res Rev. 13 (2): 129–35. doi:10.1002/mrdd.20143. PMID 17563895.
  89. ^ Cass H (1998). "Visual impairment and autism: current questions and future research". Autism. 2 (2): 117–38. doi:10.1177/1362361398022002.
  90. ^ "Diagnosis: how can it benefit me as an adult?". National Autistic Society. 2005. Retrieved 2008-03-24.
  91. ^ a b c Rogers SJ, Vismara LA (2008). "Evidence-based comprehensive treatments for early autism". J Clin Child Adolesc Psychol. 37 (1): 8–38. doi:10.1080/15374410701817808. PMID 18444052.
  92. ^ Pettus A (2008). "A spectrum of disorders". Harv Mag. 110 (3): 27–31, 89–91.
  93. ^ a b Howlin P (2006). "Autism spectrum disorders". Psychiatry. 5 (9): 320–4. doi:10.1053/j.mppsy.2006.06.007.
  94. ^ Eikeseth S (2008). "Outcome of comprehensive psycho-educational interventions for young children with autism". Res Dev Disabil. doi:10.1016/j.ridd.2008.02.003. PMID 18385012.
  95. ^ Van Bourgondien ME, Reichle NC, Schopler E (2003). "Effects of a model treatment approach on adults with autism". J Autism Dev Disord. 33 (2): 131–40. doi:10.1023/A:1022931224934. PMID 12757352.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  96. ^ Leskovec TJ, Rowles BM, Findling RL (2008). "Pharmacological treatment options for autism spectrum disorders in children and adolescents". Harv Rev Psychiatry. 16 (2): 97–112. doi:10.1080/10673220802075852. PMID 18415882.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  97. ^ Oswald DP, Sonenklar NA (2007). "Medication use among children with autism spectrum disorders". J Child Adolesc Psychopharmacol. 17 (3): 348–55. doi:10.1089/cap.2006.17303. PMID 17630868.
  98. ^ Posey DJ, Stigler KA, Erickson CA, McDougle CJ (2008). "Antipsychotics in the treatment of autism". J Clin Invest. 118 (1): 6–14. doi:10.1172/JCI32483. PMID 18172517.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  99. ^ Lack of research on drug treatments:
  100. ^ Buitelaar JK (2003). "Why have drug treatments been so disappointing?". Novartis Found Symp. 251: 235–44, discussion 245–9, 281–97. doi:10.1002/0470869380.ch14. PMID 14521196.
  101. ^ Lack of support for interventions:
  102. ^ a b Aman MG (2005). "Treatment planning for patients with autism spectrum disorders". J Clin Psychiatry. 66 (Suppl 10): 38–45. PMID 16401149.
  103. ^ Stahmer AC, Collings NM, Palinkas LA (2005). "Early intervention practices for children with autism: descriptions from community providers". Focus Autism Other Dev Disabl. 20 (2): 66–79. doi:10.1177/10883576050200020301. PMC 1350798. PMID 16467905.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  104. ^ Angley M, Semple S, Hewton C, Paterson F, McKinnon R (2007). "Children and autism—part 2—management with complementary medicines and dietary interventions" (PDF). Aust Fam Physician. 36 (10): 827–30. PMID 17925903.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  105. ^ Hediger ML, England LJ, Molloy CA, Yu KF, Manning-Courtney P, Mills JL (2008). "Reduced bone cortical thickness in boys with autism or autism spectrum disorder". J Autism Dev Disord. 38 (5): 848–56. doi:10.1007/s10803-007-0453-6. PMID 17879151. {{cite journal}}: Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)CS1 maint: multiple names: authors list (link)
  106. ^ Brown MJ, Willis T, Omalu B, Leiker R (2006). "Deaths resulting from hypocalcemia after administration of edetate disodium: 2003–2005". Pediatrics. 118 (2): e534–6. doi:10.1542/peds.2006-0858. PMID 16882789.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  107. ^ Ganz ML (2007). "The lifetime distribution of the incremental societal costs of autism". Arch Pediatr Adolesc Med. 161 (4): 343–9. doi:10.1001/archpedi.161.4.343. PMID 17404130. {{cite journal}}: Unknown parameter |laydate= ignored (help); Unknown parameter |laysource= ignored (help); Unknown parameter |laysummary= ignored (help)
  108. ^ Sharpe DL, Baker DL (2007). "Financial issues associated with having a child with autism". J Fam Econ Iss. 28 (2): 247–64. doi:10.1007/s10834-007-9059-6.
  109. ^ Montes G, Halterman JS (2008). "Association of childhood autism spectrum disorders and loss of family income". Pediatrics. 121 (4): e821–6. doi:10.1542/peds.2007-1594. PMID 18381511.
  110. ^ Montes G, Halterman JS Z (2008). "Child care problems and employment among families with preschool-aged children with autism in the United States". Pediatrics. 122 (1): e202–8. doi:10.1542/peds.2007-3037. PMID 18595965.
  111. ^ Seltzer MM, Shattuck P, Abbeduto L, Greenberg JS (2004). "Trajectory of development in adolescents and adults with autism" (PDF). Ment Retard Dev Disabil Res Rev. 10 (4): 234–47. doi:10.1002/mrdd.20038. PMID 15666341. Retrieved 2008-04-17.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  112. ^ Tidmarsh L, Volkmar FR (2003). "Diagnosis and epidemiology of autism spectrum disorders". Can J Psychiatry. 48 (8): 517–25. PMID 14574827.
  113. ^ Billstedt E, Gillberg C, Gillberg C (2005). "Autism after adolescence: population-based 13- to 22-year follow-up study of 120 individuals with autism diagnosed in childhood". J Autism Dev Disord. 35 (3): 351–60. doi:10.1007/s10803-005-3302-5. PMID 16119476.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  114. ^ Eaves LC, Ho HH (2008). "Young adult outcome of autism spectrum disorders". J Autism Dev Disord. 38 (4): 739–47. doi:10.1007/s10803-007-0441-x. PMID 17764027.
  115. ^ Fombonne E (2005). "Epidemiology of autistic disorder and other pervasive developmental disorders". J Clin Psychiatry. 66 (Suppl 10): 3–8. PMID 16401144.
  116. ^ Changes in diagnostic practices:
  117. ^ Kolevzon A, Gross R, Reichenberg A (2007). "Prenatal and perinatal risk factors for autism". Arch Pediatr Adolesc Med. 161 (4): 326–33. doi:10.1001/archpedi.161.4.326. PMID 17404128.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  118. ^ Folstein SE, Rosen-Sheidley B (2001). "Genetics of autism: complex aetiology for a heterogeneous disorder". Nat Rev Genet. 2 (12): 943–55. doi:10.1038/35103559. PMID 11733747.
  119. ^ Zafeiriou DI, Ververi A, Vargiami E (2007). "Childhood autism and associated comorbidities". Brain Dev. 29 (5): 257–72. doi:10.1016/j.braindev.2006.09.003. PMID 17084999.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  120. ^ Dawson M, Mottron L, Gernsbacher MA (2008). "Learning in autism". In Byrne JH (ed.-in-chief), Roediger HL III (vol. ed.) (ed.). Learning and Memory: A Comprehensive Reference. Vol. 2. Academic Press. pp. 759–72. doi:10.1016/B978-012370509-9.00152-2. ISBN 0-12-370504-5. {{cite book}}: |access-date= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)CS1 maint: multiple names: authors list (link)
  121. ^ Chakrabarti S, Fombonne E (2001). "Pervasive developmental disorders in preschool children". JAMA. 285 (24): 3093–9. doi:10.1001/jama.285.24.3093. PMID 11427137.
  122. ^ Levisohn PM (2007). "The autism-epilepsy connection". Epilepsia. 48 (Suppl 9): 33–5. PMID 18047599.
  123. ^ Ozgen HM, Hop JW, Hox JJ, Beemer FA, van Engeland H (2008). "Minor physical anomalies in autism: a meta-analysis". Mol Psychiatry. doi:10.1038/mp.2008.75. PMID 18626481.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  124. ^ Steyaert JG, De La Marche W (2008). "What's new in autism?". Eur J Pediatr. doi:10.1007/s00431-008-0764-4. PMID 18597114.
  125. ^ Wing L (1997). "The history of ideas on autism: legends, myths and reality". Autism. 1 (1): 13–23. doi:10.1177/1362361397011004.
  126. ^ Miles M (2005). "Martin Luther and childhood disability in 16th century Germany: what did he write? what did he say?". Independent Living Institute. Retrieved 2007-07-18.
  127. ^ a b c Wolff S (2004). "The history of autism". Eur Child Adolesc Psychiatry. 13 (4): 201–8. doi:10.1007/s00787-004-0363-5. PMID 15365889.
  128. ^ Kuhn R; tr. Cahn CH (2004). "Eugen Bleuler's concepts of psychopathology". Hist Psychiatry. 15 (3): 361–6. doi:10.1177/0957154X04044603. PMID 15386868.{{cite journal}}: CS1 maint: multiple names: authors list (link) The quote is a translation of Bleuler's 1910 original.
  129. ^ Asperger H (1938). "Das psychisch abnormale Kind". Wien Klin Wochenschr (in German). 51: 1314–7.
  130. ^ Fombonne E (2003). "Modern views of autism". Can J Psychiatry. 48 (8): 503–5. PMID 14574825.
  131. ^ Szatmari P, Jones MB (2007). "Genetic epidemiology of autism spectrum disorders". In Volkmar FR (ed.). Autism and Pervasive Developmental Disorders (2nd ed ed.). Cambridge University Press. pp. 157–78. ISBN 0521549574. {{cite book}}: |edition= has extra text (help)
  132. ^ Chambres P, Auxiette C, Vansingle C, Gil S (2008). "Adult attitudes toward behaviors of a six-year-old boy with autism". J Autism Dev Disord. doi:10.1007/s10803-007-0519-5. PMID 18297387.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  133. ^ Heidgerken AD, Geffken G, Modi A, Frakey L (2005). "A survey of autism knowledge in a health care setting". J Autism Dev Disord. 35 (3): 323–30. doi:10.1007/s10803-005-3298-x. PMID 16119473.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  134. ^ Biever C (2007-06-30). "Web removes social barriers for those with autism". New Scientist. No. 2610.
  135. ^ Harmon A (2004-12-20). "How about not 'curing' us, some autistics are pleading". New York Times. Retrieved 2007-11-07.
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