Second to fourth digit ratio and cooperative behavior

@article{Millet2006SecondTF,
  title={Second to fourth digit ratio and cooperative behavior},
  author={Kobe Millet and Siegfried Dewitte},
  journal={Biological Psychology},
  year={2006},
  volume={71},
  pages={111-115}
}

Figures from this paper

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Many studies report on the association between 2D:4D, a putative marker for prenatal testosterone exposure, and economic preferences. However, most of these studies have limited sample sizes and test
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