Behaviors1 mentions

Measure D2:D4 Finger Length Ratio Correctly

If doing the finger-ratio experiment, measure from the base crease of the finger to the tip, excluding fingernails; compare index finger (D2) to ring finger (D4).

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“If you want to measure D2, D4 ratio, you're welcome to... You have to actually measure it and you have to measure it correctly. You have to measure it from the base of the finger where there's that first crease all the way to the tip, past the, you can't include the fingernails.”

huberman · How Hormones Shape Sexual Development · Apr 5, 2021 · 1:30:26 · open ↗

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