Your fingers may hold a secret of human brain evolution
Researchers are investigating the 'estrogenized ape hypothesis,' which suggests that prenatal estrogen exposure influenced human brain evolution. By measuring the ratio of index to ring finger lengths in newborns, scientists found a correlation between higher estrogen exposure and larger head circumference in boys.
Human evolution is closely associated with the development of a much larger brain. New research suggests that greater exposure to estrogen before birth may have contributed to that expansion, and that a possible trace of this hormonal influence can be seen in the relative lengths of a person's fingers.
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