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Heritability of interests: a twin study
D T Lykken1, T J Bouchard, M McGue
1Department of Psychology, University of Minnesota, Minneapolis 55455-0344.
The Journal of Applied Psychology
|August 1, 1993
Summary
Genetic factors significantly influence vocational and recreational interests, accounting for approximately 50% of the variance. This suggests a strong heritability of interests, impacting career choices and personal pursuits.
Area of Science:
- Behavioral Genetics
- Psychology
- Individual Differences
Background:
- Understanding the origins of vocational and recreational interests is crucial for career development and personal fulfillment.
- Twin studies are a powerful tool for disentangling genetic and environmental influences on complex human traits.
Purpose of the Study:
- To investigate the heritability of vocational and recreational interests and talents.
- To explore the genetic and environmental contributions to individual differences in interests.
- To propose a model explaining the development of interests based on genetic predispositions.
Main Methods:
- Administered vocational and recreational interest and talent inventories to 924 pairs of twins reared together and 92 pairs reared apart.
- Utilized factor analysis to identify underlying factors and superfactors within the interest data.
- Calculated heritability estimates using within-pair correlations from monozygotic twins.
Main Results:
- Factor analysis revealed 39 identifiable factors and 11 superfactors among the 291 inventory items.
- Approximately 50% of the variance in interests was associated with genetic variation.
- Heritability estimates were conservatively derived from adult monozygotic twins reared together.
Conclusions:
- Genetic factors play a substantial role in shaping vocational and recreational interests.
- Nonadditive genetic effects may account for lower heritability estimates found in traditional family studies.
- A model is proposed where genetically influenced precursor traits (aptitude, personality) guide interest development via gene-environment interactions.