The new experiment involved 36 healthy people as well as 44 patients at a psychiatric hospital in Kermanshah.
After analyzing all the data obtained, it turned out that the ring fingers were longer than the index fingers in people with amphetamine use disorder, antisocial psychopathy, and a combination of both. This indicates a lower digital index value. This index was lower in men than in women in all groups.
Scientist Serge Brand, one of the authors of the paper, suggested that people with mental problems were probably exposed to stronger testosterone and weaker estrogen while still in the womb.
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Source: Ferra
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