According to Science, the idea that finger lengths reveal significant personality characteristics comes from evolutionary biologist John Manning, now at Swansea University. His work has inspired over 1,400 studies in just over 20 years, linking finger ratios to personality, cognitive abilities, and disease risks. Some researchers have even used these ratios to speculate on the gender of ancient cave painters.
Further, the magazine writes that finger ratios emerged as a solution in the late 1950s when researchers linked prenatal testosterone to brain development and behavior. With fetal hormone sampling being risky, scientists use finger ratios as a non-invasive way to study traits influenced by prenatal hormones, like aggression and sexual orientation.
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