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Unitary personality source traits analyzed for heritability

R B Cattell, D C Rao, J M Schuerger

    Human Heredity
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    This study on adolescent boys found that ego assertion (UI 16) and independence (UI 19) are significantly heritable traits. Control and upbringing (UI 17) showed minimal genetic influence, suggesting environmental factors are more critical.

    Area of Science:

    • Behavioral genetics
    • Developmental psychology
    • Personality psychology

    Background:

    • Understanding the genetic and environmental contributions to personality traits is crucial for developmental and psychological theories.
    • Previous research has explored various factors influencing personality, but a comprehensive behavior-genetic analysis of specific source traits in adolescent males was needed.

    Purpose of the Study:

    • To investigate the heritability of three personality source traits: ego assertion (UI 16), control/upbringing (UI 17), and independence (UI 19) in adolescent boys.
    • To differentiate between genetic, environmental, and gene-environment interaction influences on these traits using a multiple abstract variance analysis (MAVA) model.

    Main Methods:

    • A sample of 1,768 adolescent boys (ages 12-18) from various family structures (twins, siblings, unrelated cohabitants, general population) were assessed using the O-A personality battery.

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  • A multiple abstract variance analysis (MAVA) model was employed to estimate genetic and environmental contributions to the observed variances in personality traits.
  • Maximum likelihood analysis was used to determine the best-fitting model for the data, considering genetic, environmental (threptic), and genothreptic covariances.

    • Main Results:

    • Population heritability estimates were: 0.46 for UI 16 (ego assertion), 0.21 for UI 17 (control, upbringing), and 0.50 for UI 19 (independence).
    • A parsimonious MAVA model, excluding genothreptic correlations, provided the best fit for the data.
    • Results indicated that UI 17 is minimally heritable, while UI 16 and UI 19 exhibit substantial genetic influence.

    Conclusions:

    • Ego assertion (UI 16) appears to be an early-developing temperament factor, potentially linked to physiological aspects.
    • Independence (UI 19) is a robust, sex-related temperament factor.
    • Control and upbringing (UI 17) represent a learned inhibition pattern, predominantly shaped by family and social environment.