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Behavioral genetics and personality change.

R Plomin1, J R Nesselroade

  • 1Department of Human Development and Family Studies, College of Health and Human Development, Pennsylvania State University, University Park 16802.

Journal of Personality
|March 1, 1990
PubMed
Summary
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Behavioral genetics research shows heritability of personality traits may increase with age. While adult personality change has slight genetic influence, childhood personality change is substantially genetic.

Area of Science:

  • Behavioral genetics
  • Developmental psychology
  • Personality science

Background:

  • Traditional research in personality and behavioral genetics emphasizes trait continuity.
  • Understanding trait change is crucial for advancing these fields.

Purpose of the Study:

  • To review personality research on age differences in heritability.
  • To propose that heritability tends to increase with developmental changes.
  • To analyze genetic influences on short-term and long-term personality change.

Main Methods:

  • Review of existing personality research on heritability and age.
  • Behavioral genetic analyses of developmental change.
  • Examination of genetic influence on short-term personality fluctuations.

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Main Results:

  • A counterintuitive hypothesis: heritability of personality traits tends to increase with age.
  • Genetic involvement in adult personality change is minimal.
  • Childhood personality development is significantly influenced by genetic factors.

Conclusions:

  • Trait change, not just continuity, is vital in personality and behavioral genetics.
  • Heritability may increase across the lifespan.
  • Genetic factors play a substantial role in childhood personality development but less so in adulthood.