Openness to experience
Openness to experience is one of the domains which are used to describe human personality in the Five Factor Model. Openness involves six facets, or dimensions, including active imagination (fantasy), aesthetic sensitivity, attentiveness to inner feelings, preference for variety, and intellectual curiosity. A great deal of psychometric research has demonstrated that these facets or qualities are significantly correlated. Thus, openness can be viewed as a global personality trait consisting of a set of specific traits, habits, and tendencies that cluster together.
Openness tends to be normally distributed with a small number of individuals scoring extremely high or low on the trait, and most people scoring moderately. People who score low on openness are considered to be closed to experience. They tend to be conventional and traditional in their outlook and behavior. They prefer familiar routines to new experiences, and generally have a narrower range of interests. People high in openness tend to have more liberal political views, whereas those who are low in openness tend to be more conservative, and are more likely to endorse authoritarian, ethnocentric and prejudiced views.
Openness has moderate positive relationships with creativity, intelligence and knowledge. Openness is related to the psychological trait of absorption, and like absorption has a modest relationship to individual differences in hypnotic susceptibility.
Openness has more modest relationships with aspects of subjective well-being than other Five Factor Model personality traits. On the whole openness appears to be largely unrelated to symptoms of mental disorders. Religious fundamentalism and to a lesser extent general traditional religiosity tend to be associated with low openness, whereas open mature religiosity and spirituality tend to be associated with high openness.
- 1 Measurement
- 2 Psychological aspects
- 2.1 Creativity
- 2.2 Intelligence and knowledge
- 2.3 Absorption and hypnotisability
- 2.4 Relationship to other personality traits
- 2.5 Social and political attitudes
- 2.6 Subjective well-being and mental health
- 2.7 Personality disorders
- 2.8 Religiosity and spirituality
- 2.9 Gender
- 2.10 Dream recall
- 2.11 Sexuality
- 3 Genes and physiology
- 4 Geography
- 5 Drug use
- 6 See also
- 7 Notes
- 8 References
Openness to experience is usually assessed with self-report measures, although peer-reports and third-party observation are also used. Self-report measures are either lexical or based on statements. Which measure of either type is used is determined by an assessment of psychometric properties and the time and space constraints of the research being undertaken
- Lexical measures use individual adjectives that reflect openness to experience traits, such as creative, intellectual, artistic, philosophical, deep. Goldberg (1992) developed a 20-word measure as part of his 100-word Big Five markers. Saucier (1994) developed a briefer 8-word measure as part of his 40-word mini-markers. However, the psychometric properties of Saucier’s original mini-markers have been found suboptimal with samples outside of North America. As a result, a systematically revised measure was developed to have better psychometric properties, the International English Mini-Markers. The International English Mini-Markers has good psychometric validity for assessing openness and other five factor personality model dimensions, both within and, especially, without American populations. Internal consistency reliability of the Openness measure is .84 for both native and non-native English-speakers.
- Statement measures tend to comprise more words, and hence take up more research instrument space, than lexical measures. For example, the Openness (intellect) scale of Goldberg's International Personality Item Pool is 45 words compared Saucier or Thompson’s (2008) 8-word lexical scale for Openness. Examples of statement measure items are Love to think up new ways of doing things and Have difficulty understanding abstract ideas. Two examples of statement measures are the NEO PI-R, based on the Five Factor Model, and the HEXACO-PI-R based on the HEXACO model of personality. In these tests, openness to experience is one of the six measured personality dimensions; in both tests openness to experience has a number of facets. The NEO PI-R assesses six facets called openness to ideas, feelings, values, fantasy, aesthetics, and actions respectively. The HEXACO-PI-R assesses four facets called inquisitiveness, creativity, aesthetic appreciation, and unconventionality.
A number of studies have found that openness to experience has two major subcomponents, one related to intellectual dispositions, the other related to the experiential aspects of openness, such as aesthetic appreciation and openness to sensory experiences. These subcomponents have been referred to as intellect and experiencing openness respectively, and have a strong positive correlation (r = .55) with each other. 
According to research by Sam Gosling, it is possible to assess openness by examining people's homes and work spaces. Individuals who are highly open to experience tend to have distinctive and unconventional decorations. They are also likely to have books on a wide variety of topics, a diverse music collection, and works of art on display.
Openness to experience has both motivational and structural components. People high in openness are motivated to seek new experiences and to engage in self-examination. Structurally, they have a fluid style of consciousness that allows them to make novel associations between remotely connected ideas. Closed people by contrast are more comfortable with familiar and traditional experiences.
Openness to experience correlates with creativity, as measured by tests of divergent thinking. Openness has been linked to both artistic and scientific creativity as professional artists and scientists have been found to score higher in openness compared to members of the general population.
Intelligence and knowledge
Openness to experience correlates with intelligence, correlation coefficients ranging from about r = .30 to r = .45. Openness to experience is moderately associated with crystallized intelligence, but only weakly with fluid intelligence. A study examining the facets of openness found that the Ideas and Actions facets had modest positive correlations with fluid intelligence (r=.20 and r=.07 respectively). These mental abilities may come more easily when people are dispositionally curious and open to learning. Several studies have found positive associations between openness to experience and general knowledge. People high in openness may be more motivated to engage in intellectual pursuits that increase their knowledge. Openness to experience, especially the Ideas facet, is related to need for cognition, a motivational tendency to think about ideas, scrutinize information, and enjoy solving puzzles, and to typical intellectual engagement (a similar construct to need for cognition).
Absorption and hypnotisability
Openness to experience is strongly related to the psychological construct of absorption defined as "a disposition for having episodes of 'total' attention that fully engage one's representational (i.e. perceptual, enactive, imaginative, and ideational) resources.” The construct of absorption was developed in order to relate individual differences in hypnotisability to broader aspects of personality. The construct of absorption influenced Costa and McCrae's development of the concept of openness to experience in their original NEO model due to the independence of absorption from extraversion and neuroticism. A person's openness to becoming absorbed in experiences seems to require a more general openness to new and unusual experiences. Openness to experience, like absorption has modest positive correlations with individual differences in hypnotisability. Factor analysis has shown that the fantasy, aesthetics, and feelings facets of openness are closely related to absorption and predict hypnotisability, whereas the remaining three facets of ideas, actions, and values are largely unrelated to these constructs. This finding suggests that openness to experience may have two distinct yet related subdimensions: one related to aspects of attention and consciousness assessed by the facets of fantasy, aesthetics, and feelings; the other related to intellectual curiosity and social/political liberalism as assessed by the remaining three facets. However, all of these have a common theme of ‘openness’ in some sense. This two-dimensional view of openness to experience is particularly pertinent to hypnotisability. However, when considering external criteria other than hypnotisability, it is possible that a different dimensional structure may be apparent, e.g. intellectual curiosity may be unrelated to social/political liberalism in certain contexts.
Relationship to other personality traits
Although the factors in the Big Five model are assumed to be independent, openness to experience and extraversion as assessed in the NEO-PI-R have a substantial positive correlation. Openness to experience also has a moderate positive correlation with sensation-seeking, particularly, the experience seeking facet. In spite of this, it has been argued that openness to experience is still an independent personality dimension from these other traits because most of the variance in the trait cannot be explained by its overlap with these other constructs. A study comparing the Temperament and Character Inventory with the Five Factor model found that Openness to experience had a substantial positive correlation with self-transcendence (a "spiritual" trait) and to a lesser extent novelty seeking (conceptually similar to sensation seeking). It also had a moderate negative correlation with harm avoidance. The Myers-Briggs Type Indicator (MBTI) measures the preference of "intuition," which is related to openness to experience. Robert McCrae pointed out that the MBTI sensation versus intuition scale "contrasts a preference for the factual, simple and conventional with a preference for the possible, complex, and original," and is therefore similar to measures of openness.
Social and political attitudes
There are social and political implications to this personality trait. People who are highly open to experience tend to be politically liberal and tolerant of diversity. As a consequence, they are generally more open to different cultures and lifestyles. They are lower in ethnocentrism, right-wing authoritarianism, social dominance orientation, and prejudice. Openness has a stronger (negative) relationship with right-wing authoritarianism than the other five-factor model traits (conscientiousness has a modest positive association, and the other traits have negligible associations). Openness has a somewhat smaller (negative) association with social dominance orientation than (low) agreeableness (the other traits have negligible associations). Openness has a stronger (negative) relationship with prejudice than the other five-factor model traits (agreeableness has a more modest negative association, and the other traits have negligible associations). However, right-wing authoritarianism and social dominance orientation are each more strongly (positively) associated with prejudice than openness or any of the other five-factor model traits.
In regards to conservatism, studies have found that cultural conservatism was related to low openness and all its facets, but economic conservatism was unrelated to total openness, and only weakly negatively related to the Aesthetics and values facets. The strongest personality predictor of economic conservatism was low agreeableness (r= -.23). Economic conservatism is based more on ideology whereas cultural conservatism seems to be more psychological than ideological and may reflect a preference for simple, stable and familiar mores.
Subjective well-being and mental health
Openness to experience has been found to have modest yet significant associations with happiness, positive affect, and quality of life and to be unrelated to life satisfaction, negative affect, and overall affect in people in general. These relationships with aspects of subjective well-being tend to be weaker compared to those of other five-factor model traits, that is, extraversion, neuroticism, conscientiousness, and agreeableness. Openness to experience was found to be associated with life satisfaction in older adults after controlling for confounding factors. Openness appears to be generally unrelated to the presence of mental disorders. A meta-analysis of the relationships between five-factor model traits and symptoms of psychological disorders found that none of the diagnostic groups examined differed from healthy controls on openness to experience.
At least three aspects of openness are relevant to understanding personality disorders: cognitive distortions, lack of insight and impulsivity. Problems related to high openness that can cause problems with social or professional functioning are excessive fantasising, peculiar thinking, diffuse identity, unstable goals and nonconformity with the demands of the society.
High openness is characteristic to schizotypal personality disorder (odd and fragmented thinking), narcissistic personality disorder (excessive self-valuation) and paranoid personality disorder (sensitivity to external hostility). Lack of insight (shows low openness) is characteristic to all personality disorders and could explain the persistence of maladaptive behavioral patterns.
The problems associated with low openness are difficulties adapting to change, low tolerance for different worldview or lifestyles, emotional flattening, alexithymia and a narrow range of interests. Rigidity is the most obvious aspect of (low) openness among personality disorders and that shows lack of knowledge of one's emotional experiences. It is most characteristic of obsessive-compulsive personality disorder, the opposite of it known as impulsivity (here: an aspect of openness that shows a tendency to behave unusually or autistically) is characteristic of schizotypal and borderline personality disorders.
Religiosity and spirituality
Openness to experience has mixed relationships with different types of religiosity and spirituality. General religiosity has a weak association with low openness. Religious fundamentalism has a somewhat more substantial relationship with low openness. Open, mature religiosity and spirituality on the other hand tend to be associated with high openness; mystical experiences occasioned by the use of psilocybin were found to increase openness significantly (see 'Drug Use,' below).
A study examining gender differences in big five personality traits in 55 nations found that across nations there were negligible average differences between men and women in openness to experience. By contrast, across nations women were found to be significantly higher than men in average neuroticism, extraversion, agreeableness, and conscientiousness. In 8 cultures, men were significantly higher than women in openness, but in 4 cultures women were significantly higher than men. Previous research has found that women tend to be higher on the feelings facet of openness, whereas men tend to be higher on the ideas facet, although the 55 nation study did not assess individual facets.
A study on individual differences in the frequency of dream recall found that openness to experience was the only big five personality trait related to dream recall. Dream recall frequency has also been related to similar personality traits, such as absorption and dissociation. The relationship between dream recall and these traits has been considered as evidence of the continuity theory of consciousness. Specifically, people who have vivid and unusual experiences during the day, such as those who are high on these traits, tend to have more memorable dream content and hence better dream recall.
Openness is related to many aspects of sexuality. Men and women high in openness are more well-informed about sex, have wider sexual experience, stronger sex drives, and more liberal sexual attitudes. In married couples, wives' but not husbands' level of openness is related to sexual satisfaction. This might be because open wives are more willing to explore a variety of new sexual experiences, leading to greater satisfaction for both spouses.
Genes and physiology
Openness to experience, like the other traits in the five factor model, is believed to have a genetic component. Identical twins (who have the same DNA) show similar scores on openness to experience, even when they have been adopted into different families and raised in very different environments. One genetic study with 86 subjects found Openness to experience related to the 5-HTTLPR polymorphism associated with the serotonin transporter gene.
Higher levels of openness have been linked to activity in the ascending dopaminergic system and the dorsolateral prefrontal cortex. Openness is the only personality trait that correlates with neuropsychological tests of dorsolateral prefrontal cortical function, supporting theoretical links among openness, cognitive functioning, and IQ.
An Italian study found that people who lived on Tyrrhenian islands tended to be less open to experience than those living on the nearby mainland, and that people whose ancestors had inhabited the islands for twenty generations tended to be less open to experience than more recent arrivals. Additionally, people who emigrated from the islands to the mainland tended to be more open to experience than people who stayed on the islands, and than those who immigrated to the islands.
People living in the eastern and western parts of the United States tend to score higher on openness to experience than those living in the midwest and the south. The highest average scores on openness are found in the states of New York, Oregon, Massachusetts, Washington, and California. Lowest average scores come from North Dakota, Wyoming, Alaska, Alabama, and Wisconsin.
Psychologists in the early 1970s used the concept of openness to experience to describe people who are more likely to use marijuana. Openness was defined in these studies as high creativity, adventuresomeness, internal sensation novelty seeking, and low authoritarianism. Several correlational studies confirmed that young people who score high on this cluster of traits are more likely to use marijuana. More recent research has replicated this finding using contemporary measures of openness.
Cross-cultural studies have found that cultures high in Openness to Values have higher rates of use of the drug ecstasy, although a study at the individual level in the Netherlands found no differences in openness levels between users and non-users. Ecstasy users actually tended to be higher in extraversion and lower in conscientiousness than non-users.
A 2011 study found Openness (and not other traits) increased with the use of psilocybin, an effect that held even after 14 months. The study found that individual differences in levels of mystical experience while taking psilocybin were correlated with increases in Openness. Participants who met criteria for a 'complete mystical experience'[note 1] experienced a significant mean increase in Openness, whereas those participants who did not meet the criteria experienced no mean change in Openness. Five of the six facets of Openness (all except Actions) showed this pattern of increase associated with having a mystical experience. Increases in Openness (including facets as well as total score) among those whose had a complete mystical experience were maintained more than a year after taking the drug. Participants who had a complete mystical experience changed more than 4 T-score points between baseline and follow up. By comparison, Openness has been found to normally decrease with ageing by 1 T-score point per decade.
- Six aspects of mystical experience were assessed: unity, transcendence of time and space, ineffability and paradoxicality, sacredness, noetic quality, and positive mood. Participants were deemed to have a 'complete' mystical experience if they scored 60% or higher on all six aspects.
- Goldberg L. R. (1993). "The structure of phenotypic personality traits". American Psychologist 48 (1): 26–34. doi:10.1037/0003-066X.48.1.26. PMID 8427480.
- McCrae R. R., John O. P. (1992). "An introduction to the Five-Factor Model and its applications". Journal of Personality 60 (2): 175–215. doi:10.1111/j.1467-6494.1992.tb00970.x. PMID 1635039.
- Costa, P. T. & McCrae, R. R. (1992). NEO personality Inventory professional manual. Odessa, FL: Psychological Assessment Resources.
- Butler, J. C. (2000). "Personality and emotional correlates of right-wing authoritarianism". Social Behavior and Personality 28: 1–14. doi:10.2224/sbp.2000.28.1.1.
- Sibley, Chris G.; Duckitt, John (2000). "Personality and prejudice: a meta-analysis and theoretical review". Personality and Social Psychology Review 12 (3): 248–279. doi:10.1177/1088868308319226. PMID 18641385.
- Steel, Piers; Schmidt, Joseph & Shultz, Jonas (2008). "Refining the relationship between personality and Subjective well-being". Psychological Bulletin 134 (1): 138–161. doi:10.1037/0033-2909.134.1.138. PMID 18193998.
- Malouff, John M.; Thorsteinsson, Einar B. & Schutte, Nicola S. (2005). "The relationship between the five-factor model of personality and symptoms of clinical disorders: a meta-analysis". Journal of psychopathology and behavioral assessment 27 (2): 101–114. doi:10.1007/s10862-005-5384-y.
- Saroglou, Vassilis (2002). "Religion and the five-factors of personality: A meta-analytic review". Personality and Individual Diffenences 32: 15–25. doi:10.1016/S0191-8869(00)00233-6.
- Thompson, E.R. (October 2008). "Development and Validation of an International English Big-Five Mini-Markers". Personality and Individual Differences 45 (6): 542–548. doi:10.1016/j.paid.2008.06.013.
- Goldberg, L.R.; Johnson, JA; Eber, HW; et al (2006). "The international personality item pool and the future of public-domain personality measures". Journal of Research in Personality 40 (1): 84–96. doi:10.1016/j.jrp.2005.08.007.
- Goldberg, L.R. (1992). "The development of markers for the Big-Five factor structure". Psychological Assessment 4 (1): 26. doi:10.1037/1040-35126.96.36.199.
- Saucier, G (1994). "Mini-Markers – a brief version of Goldberg’s unipolar big-five markers". Journal of Personality Assessment 63 (3): 506–516. doi:10.1207/s15327752jpa6303_8.
- http://www.scopus.com/inward/record.url?eid=2-s2.0-4544288723&partnerID=40&md5=ed34e329995a6f728720326f9fc946b5. Missing or empty
- Connelly, B.S.; Ones, D. S.; Chernyshenko, O. S. (2014). "Introducing the Special Section on Openness to Experience: Review of Openness Taxonomies, Measurement, and Nomological Net". Journal of Personality Assessment 96 (1): 1–16. doi:10.1080/00223891.2013.830620.
- Gosling, S. (2008). Snoop: What your stuff says about you. New York: Basic Books.
- McRae, Tobert R. (2004). "Openness to Experience". Encyclopedia of Applied Psychology 2. Elsevier.
- McCrae, R. R. (1987). "Creativity, divergent thinking, and openness to experience". Journal of Personality and Social Psychology 52 (6): 1258–1265. doi:10.1037/0022-35188.8.131.528.
- Feist, G. J. (1998). A meta-analysis of the impact of personality on scientific and artistic creativity. Personality and Social Psychological Review, 2, 290–309.
- Moutafi, Joanna; Furnham, Adrian; Crump, John (2006). "What facets of openness and conscientiousness predict fluid intelligence score?". Learning and Individual Differences 16: 31–42. doi:10.1016/j.lindif.2005.06.003.
- Geary, D. C. (2005). The origin of mind: Evolution of brain, cognition, and general intelligence. Washington, DC: American Psychological Association. ISBN 1-59147-181-8.
- Furnham, Adrian; Chamorro-Premuzic, Tomas (2006). "Personality, intelligence, and general knowledge". Learning and Individual Differences 16: 79–90. doi:10.1016/j.lindif.2005.07.002.
- Chamorro-Premuzic, Tomas; Furnham, Adrian & Ackerman, Phillip L. (2006). "Ability and personality correlates of general knowledge". Personality and Individual Differences 41 (3): 419–429. doi:10.1016/j.paid.2005.11.036.
- Furnham, Adrian; Christopher, Andrew N.; Garwood, Jeanette & Martin, G. Neil (2007). "Approaches to learning and the acquisition of general knowledge". Personality and Individual Differences 43 (6): 1563–1571. doi:10.1016/j.paid.2007.04.013.
- Furnham, Adrian; Swami, Viren; Arteche, Adriane & Chamorro-Premuzic, Tomas (2008). "Cognitive ability, learning approaches and personality correlates of general knowledge". Educational Psychology 28 (4): 427–437. doi:10.1080/01443410701727376.
- Fleischhauer, Monica; Enge, Sören; Brocke, Burkhard; Ullrich, Johannes; Strobel, Alexander; Strobel, Anja (2010). "Same or Different? Clarifying the Relationship of Need for Cognition to Personality and Intelligence". Personality and Social Psychology Bulletin 36 (1): 82–96. doi:10.1177/0146167209351886. PMID 19901274.
- Rocklin, Thomas (1994). "Relation Between Typical Intellectual Engagement and Openness : Comment on Goff and Ackerman ( 1992 )". Journal of Educational Psychology 86 (1): 145–149. doi:10.1037/0022-06184.108.40.206.
- Mussell, Patrick (2010). "Epistemic curiosity and related constructs: Lacking evidence of discriminant validity". Personality and Individual Differences 49 (5): 506–510. doi:10.1016/j.paid.2010.05.014.
- Phares, E.J.; Chaplin, W.F. (1997). "Chapter 15. Personality and Intellect". Introduction to personality (Fourth ed.). New York: Longman. p. 522. ISBN 0-673-99456-2.
- Tellegen, Auke; Atkinson, Gilbert (1974). "Openness to absorbing and self-altering experiences ("absorption"), a trait related to hypnotic susceptibility". Journal of a bnormal Psychology 83 (3): 268–277. doi:10.1037/h0036681.
- Glisky, Martha L.; Tataryn, D.J.; Tobias, B.A.; Kihlstrom, J.F. (1991). "Absorption, Openness to Experience, and Hypnotizability". Journal of Personality and Social Psychology 60 (2): 263–272. doi:10.1037/0022-35220.127.116.113. PMID 2016669.
- Aluja, Anton; Garcı́a, Óscar; Garcı́a, Luis F. (2002). "A comparative study of Zuckerman's three structural models for personality through the NEO-PI-R, ZKPQ-III-R, EPQ-RS and Goldberg's 50-bipolar adjectives". Personality and Individual Differences 33 (5): 713. doi:10.1016/S0191-8869(01)00186-6.
- García, Luis F.; Aluja, Anton; García, Óscar; Cuevas, Lara (2005). "Is Openness to Experience an Independent Personality Dimension?". Journal of Individual Differences 26 (3): 132. doi:10.1027/1614-0001.26.3.132.
- De Fruyt, F.; Van De Wiele, L. & Van Heeringen, C. (2000). "Cloninger's Psychobiological Model of Temperament and Character and the Five-Factor Model of Personality". Personality and Individual Differences 29 (3): 441–452. doi:10.1016/S0191-8869(99)00204-4.
- Costa, Paul T.; McCrae, Robert R. (1992). "Four ways five factors are basic". Personality and Individual Differences 13 (6): 653. doi:10.1016/0191-8869(92)90236-I.
- McCrae, Robert R. (1994). "Openness to Experience: Expanding the boundaries of Factor V". European Journal of Personality 8 (4): 251. doi:10.1002/per.2410080404.
- McCrae R. R. (1996). "Social consequences of experiential openness". Psychological Bulletin 120 (3): 323–337. doi:10.1037/0033-2909.120.3.323. PMID 8900080.
- Jost John T (2006). "The end of the end of ideology". American Psychologist 61 (7): 651–670. doi:10.1037/0003-066X.61.7.651. PMID 17032067.
- Robert McCrae; Angelina R. Sutin (2009). "Chapter 17. Openness to Experience". In Mark R. Leary, & Rick H. Hoyle. Handbook of Individual Differences in Social Behavior. New York/London: The Guildford Press. pp. 257–273. ISBN 978-1-59385-647-2.
- Stephan, Yannick (2009). "Openness to experience and active older adults' life satisfaction: A trait and facet-level analysis". Personality and Individual Differences 47 (6): 637–641. doi:10.1016/j.paid.2009.05.025.
- Piedmont, R. L., Sherman, M. F., Sherman, N. C. (2012). "Maladaptively High and Low Openness: The Case for Experiential Permeability.". Journal of Personality.
- Piedmont, R. L., Sherman, M. F., Sherman, N. C., Dy-Liacco, G. S., Williams, J. E. G. (2009). "Using the Five-Factor Model to Identify a New Personality Disorder Domain: The Case for Experiential Permeability.". Journal of Personality and Social Psychology 96: 1245–1258. doi:10.1037/a0015368.
- David P. Schmitt; Realo, A; Voracek, M., & Allik, J. (2008). "Why can't a man be more like a woman? Sex differences in big five personality traits across 55 cultures". Journal of Personality and Social Psychology 94 (1): 168–182. doi:10.1037/0022-3518.104.22.168. PMID 18179326.
- Watson, David (2003). "To dream, perchance to remember: Individual differences in dream recall". Personality and Individual Differences 34 (7): 1271. doi:10.1016/S0191-8869(02)00114-9.
- Jang, K. L., Livesly, W. J., & Vemon, P. A. (September 1996). "Heritability of the big five personality dimensions and their facets: A twin study". Journal of Personality 64 (3): 577–592. doi:10.1111/j.1467-6494.1996.tb00522.x. PMID 8776880.
- Scott F. Stoltenberg, Geoffrey R. Twitchell, Gregory L. Hanna, Edwin H. Cook, Hiram E. Fitzgerald, Robert A. Zucker, Karley Y. Little (March 2002). "Serotonin transporter promoter polymorphism, peripheral indexes of serotonin function, and personality measures in families with alcoholism". American Journal of Medical Genetics 114 (2): 230–234. doi:10.1002/ajmg.10187. PMID 11857587.
- Colin G. DeYoung, Jordan B. Peterson and Daniel M. Higgins (2005). "Sources of openness/intellect: cognitive and neuropsychological correlates of the fifth factor of personality". Journal of Personality 73 (4): 825–858. doi:10.1111/j.1467-6494.2005.00330.x. PMID 15958136.
- Camperio Ciani A. S., Capiluppi C., Veronese A., Sartori G. (2006). "The adaptive value of personality differences revealed by small island population dynamics". European Journal of Personality 21: 3–22. doi:10.1002/per.595.
- Stephanie Simon (2008-09-23). "The United States of Mind. Researchers Identify Regional Personality Traits Across America". WSJ.com. Original research article: Peter J. Rentfrow, Samuel D. Gosling and Jeff Potter (2008). "A Theory of the Emergence, Persistence, and Expression of Geographic Variation in Psychological Characteristics". Perspectives on Psychological Science 3 (5): 339–369. doi:10.1111/j.1745-6924.2008.00084.x.
- Victor H. R., Grossman J. C., Eisenman R. (1973). "Openness to experience and marijuana use in high school students". Journal of Consulting and Clinical Psychology 41 (1): 78–85. doi:10.1037/h0035646. PMID 4726715.
- Eisenman R., Grossman J. C., Goldstein R. (1980). "Undergraduate marijuana use as related to internal sensation novelty seeking and openness to experience". Journal of Clinical Psychology 36 (4): 1013–1019. doi:10.1002/1097-4679(198010)36:4<1013::AID-JCLP2270360434>3.0.CO;2-0. PMID 7440728.
- Flory K., Lynam D., Milich R. (2002). "The relations among personality, symptoms of alcohol and marijuana abuse, and symptoms of comorbid psychopathology: Results from a community sample". Experimental and Clinical Psychopharmacology 10 (4): 425–434. doi:10.1037/1064-1222.214.171.1245. PMID 12498340.
- MacLean, K. A., Johnson, M. W., & Griffiths, R. R. (November 2011). "Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness". Journal of Psychopharmacology 25 (11): 1453–1461. doi:10.1177/0269881111420188. PMC 3537171. PMID 21956378.