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Developmental genetic studies of adult personality


, : Developmental genetic studies of adult personality. Developmental Psychology 21(3): 547-557

Genetic determinants of personality development and vulnerability to environmental influences during young adulthood were investigated using a longitudinal twin study design. College-age twin pairs (133) completed an abbreviated Minnesota Multiphasic Personality Inventory (MMPI) twice over a period of 4.5 yr at ages 20 and 25 yr old. Of the 6 MMPI scales investigated, significant genetic variance was found for 4 at both time periods (Wiggins's Social Maladjustment, Schizophrenia, Welsh A and D30 scales). Two scales (Psychopathic Deviate and Wiggins's Religiousity) showed significant genetic variance at age 20 but not at age 25. There were no significant genetic influences on directional developmental change over time, and instead, idiosyncratic environmental influences appeared most important for the developmental profiles. Significant genetic influences were present for generalized vulnerability, or instability, for the Sc scale.

US$19.90

DOI: 10.1037/0012-1649.21.3.547


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