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NO RELATIONSHIP BETWEEN INTELLIGENCE AND FACIAL ATTRACTIVENESS IN A LARGE, GENETICALLY INFORMATIVE SAMPLE
Dorian G Mitchem1, Brendan P Zietsch2, Margaret J Wright3
1Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado, United States of America ; Institute for Behavioral Genetics, University of Colorado Boulder, Boulder, Colorado, United States of America.
Facial attractiveness and general intelligence (IQ) show no significant correlation. New research and a meta-analysis suggest past studies may have overestimated this link due to publication bias.
Area of Science:
- Evolutionary Psychology
- Social Psychology
- Behavioral Genetics
Background:
- Theoretical frameworks in evolutionary and social psychology predict a positive association between facial attractiveness and general intelligence.
- Previous empirical studies have suggested a correlation, but methodological limitations and potential biases exist.
Purpose of the Study:
- To investigate the phenotypic, genetic, and environmental correlations between facial attractiveness and general intelligence (IQ).
- To address potential publication bias in existing research on the attractiveness-intelligence link.
Main Methods:
- Utilized reliable measures of facial attractiveness and IQ in a large sample of identical and fraternal twins and their siblings.
- Conducted latent factor analyses to examine genetic and environmental correlations.
- Performed a meta-analysis of existing studies, including an assessment for publication bias.
Main Results:
- No statistically significant phenotypic correlation was found between facial attractiveness and IQ.
- Neither the genetic nor the environmental latent factor correlations reached statistical significance.
- Meta-analysis indicated evidence of publication bias in previous studies, suggesting an overestimation of the relationship.
Conclusions:
- The findings do not support a significant correlation between facial attractiveness and general intelligence.
- Theoretical predictions of an attractiveness-intelligence link may require re-evaluation.
- Publication bias likely inflates the perceived strength of this relationship in the existing literature.
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