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Lack of association between digit ratio (2D:4D) and assertiveness: replication in a large sample
1Department of Basic Psychological Research, School of Psychology, University of Vienna, Liebiggasse 5, Room 03-46, A-1010 Vienna, Austria. martin.voracek@univie.ac.at
Perceptual and Motor Skills
|February 25, 2010
Summary
Digit ratio (2D:4D), a marker of prenatal androgen exposure, was not linked to assertiveness in a large study. This finding, consistent across analyses, suggests no significant relationship between 2D:4D and this personality trait.
Area of Science:
- Psychology
- Endocrinology
- Behavioral Science
Background:
- Digit ratio (2D:4D) is a proposed indicator of prenatal androgen exposure.
- Previous research on 2D:4D and personality traits, like assertiveness, has yielded inconsistent results.
- Prior studies examining 2D:4D and assertiveness were potentially underpowered.
Purpose of the Study:
- To investigate the association between digit ratio (2D:4D) and assertiveness in a large sample.
- To clarify the relationship between prenatal androgen action markers and sexually differentiated personality traits.
Main Methods:
- A large sample of 491 men and 627 women was recruited.
- Digit ratio (2D:4D) was measured and compared with assertiveness scores.
- Statistical analyses included controls for covariates, nonparametric tests, and curvilinear relation tests.
Main Results:
- Assertiveness showed modest sexual differentiation, favoring men, and correlated with age and education in women.
- Digit ratio (2D:4D) was consistently unrelated to assertiveness scores in both men and women.
- This null finding persisted even after controlling for assertiveness correlates and using advanced statistical methods.
Conclusions:
- The study replicates previous null findings, indicating no significant association between digit ratio (2D:4D) and assertiveness in a large, well-powered sample.
- The findings contribute to the understanding of the limited role of 2D:4D in predicting specific personality traits.
- Future research may require novel approaches to explore the complex interplay between prenatal hormone exposure and personality.
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