Early human developmentHumansFemaleFingersMaleInfant
Digit ratio (2D:4D) and neonatal head circumference: Evidence for oestrogenization in human brain evolution?
Barış Özener, John T Manning, Berna Ertuğrul, Fatih Aydık
Published: 202610.1016/j.earlhumdev.2026.106479
Abstract
OBJECTIVES: The second-to-fourth digit ratio (2D:4D) is widely thought to be a correlate of first trimester sex steroids, such that it is negatively correlated to testosterone and positively correlated to oestrogen. The 2D:4D has been linked to many…
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