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Modern twin studies have concluded that all studied traits are partly influenced by genetic differences, with some characteristics showing a stronger influence (e.g. height), others an intermediate level (e.g. personality traits) and some more complex heritabilities, with evidence for different genes affecting different aspects of the trait ...
Thomas J. Bouchard Jr. (born October 3, 1937) is an American psychologist known for his behavioral genetics studies of twins raised apart. He is professor emeritus of psychology and director of the Minnesota Center for Twin and Adoption Research at the University of Minnesota.
Family and twins studies: The studies of genomics of personality traits involves families and specifically twins, because they have a high heritability of the traits. The families and twins studies have showed that personality traits are moderately heritable, and can predict various lifetime outcomes, including psychopathology .
This twin study aimed to specify genetic and environmental influences on Big Five personality traits (Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism). It was determined that Big Five traits have complex etiology with both genetics and outside factors influencing these traits.
A large part of the evidence collected linking genetics and the environment to personality have come from twin studies. This "twin method" compares levels of similarity in personality using genetically identical twins. One of the first of these twin studies measured 800 pairs of twins, studied numerous personality traits, and determined that ...
[6] Krueger primarily studies the comorbidity between personality disorders and anxiety, as well as twins, heritability, personality development, conduct disorder, and antisocial personality disorder. [7] Krueger received the American Psychological Association's Award for Distinguished Scientific Early Career Contributions to Psychology in 2005.
Twin and adoption studies have demonstrated that the heritability of personality traits ranges from 0.3 to 0.6, with a mean of 0.5, indicating that 50% of variation in observable personality traits is attributable to genetic influences. [24] In contrast, family and adoption studies have demonstrated a low heritability factor. [25]
MTFS is a twin study established in June 1989 with 1300 same-gendered twin pairs age 11 or 17, with an additional cohort of 500 such pairs recruited around 2004. Twins were born between 1972 and 2000. [1] All twins born in Minnesota at that time were eligible to participate using birth registry data.