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2d4d Ratio

All articles tagged with #2d4d ratio

science1 hour ago•5 min saved

Digits as clues: prenatal estrogen linked to brain growth in evolution

A study of 225 newborns found that in boys, a higher 2D:4D finger-length ratio—an indicator of greater prenatal estrogen exposure—correlated with larger head circumference, suggesting hormones may have aided brain growth during evolution; the pattern was not observed in girls. Researchers caution that digit ratio signals hormonal exposure rather than causation, though it may support the estrogenized ape hypothesis of brain evolution and highlight potential trade-offs for males.

via ScienceDaily|

#2d4d-ratio #brain-evolution #gender-differences

science5 months ago•7 min saved

Finger Clues Hint at Prenatal Hormones Behind Brain Growth

Newborns showed a link between higher prenatal estrogen exposure (indicated by a higher 2D:4D finger ratio) and larger head size in boys, suggesting hormones before birth may have helped drive brain growth during human evolution. Girls did not show the same pattern, and the findings contribute to the idea that brain expansion carried tradeoffs for male health, consistent with the estrogenized ape hypothesis.

via SciTechDaily|

#2d4d-ratio #brain-evolution #finger-length

science1 year ago•4 min saved

Finger Length as an Indicator of Sexual Behavior and Preferences

A study from Japan found that in rats, the ratio of the second to fourth finger (2D:4D) can predict sexual activity and preference, suggesting a link between prenatal hormone exposure and adult sexual traits, with potential implications for understanding human behavior.

via Earth.com|

#2d4d-ratio #biological-markers #prenatal-hormones

science2 years ago•3 min saved

"Hand Structure and Psychopathy: What Your Fingers Can Reveal"

Scientists have found a potential link between psychopathic tendencies and finger length, specifically a lower 2D:4D ratio (a longer ring finger than index finger), which is influenced by prenatal hormone exposure. A study of 80 participants revealed that those with a lower 2D:4D ratio exhibited higher levels of psychopathic and antisocial traits. However, it's important to note that this ratio is not a definitive indicator of psychopathy, and it's also associated with better sports performance.

via Daily Mail|

#2d4d-ratio #finger-length #prenatal-hormone-exposure