Finger length ratio (2D:4D) correlates with physical aggression in men but not in women

@article{Bailey2005FingerLR,
  title={Finger length ratio (2D:4D) correlates with physical aggression in men but not in women},
  author={Allison A. Bailey and Peter L. Hurd},
  journal={Biological Psychology},
  year={2005},
  volume={68},
  pages={215-222}
}
Finger length ratio (2D:4D) is a sexually dimorphic trait. Men have relatively shorter second digits (index fingers) than fourth digits (ring fingers). Smaller, more masculine, digit ratios are thought to be associated with either higher prenatal testosterone levels or greater sensitivity to androgens, or both. Men with more masculine finger ratios are perceived as being more masculine and dominant by female observers, and tend to perform better in a number of physical sports. We hypothesized… Expand
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Abstract Variation in the influence of prenatal androgens is thought to be reflected in an individual’s finger length ratio (2D:4D). Many recent studies have examined the relationship between adultExpand
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Digit ratio (2D:4D) is a trait, which is sexually differentiated in a variety of species. In humans, males typically have shorter second digits (2Ds) (index fingers) compared to fourth digits (4Ds)Expand
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The 2D:4D (second to fourth digit) ratio is thought to be a measure of prenatal testosterone exposure, and has been linked to traits such as aggression, sexual tendencies, and verbal/spatialExpand
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Copyright 2010 by Psi Chi, The International Honor Society in Psychology (Vol. 15, No. 2/ISSN 1089-4136) Finger length ratios such as the ratio of the length of the second digit, or index finger (2D)Expand
Finger length ratios (2D:4D) in anthropoids implicate reduced prenatal androgens in social bonding.
TLDR
Test the relationship between digit ratios and behavior across nonhuman anthropoids; polygynous species, with higher levels of intrasexual competition, should have more pronounced markers of PAE (lower 2D:4D) than pair-bonded species, and results accord with those found in humans. Expand
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