Finger, sex, and side differences in fingertip size and lack of association with image-based digit ratio (2D:4D) measurements.

@article{Voracek2008FingerSA,
  title={Finger, sex, and side differences in fingertip size and lack of association with image-based digit ratio (2D:4D) measurements.},
  author={Martin Voracek and Jakob Pietschnig and Michael Oeckher},
  journal={Perceptual and motor skills},
  year={2008},
  volume={107 2},
  pages={507-12}
}
Different methods for measuring the second-to-fourth digit ratio (2D:4D), a putative marker for prenatal androgen exposure, may lead to varying values of 2D:4D. Specifically, it has been hypothesized that fingertip fat pads may be differentially deformed when taking palm images (photocopies or flatbed scans), but not when fingers are measured directly, thus yielding lower 2D:4D values from image-based measurements rather than direct ones. A measurement protocol for fingertip size is unavailable… CONTINUE READING

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