Male sex hormone - influence aggression from adolescence. Responsible for changes that occur during puberty.
Found in both sexes, adult males produce 10x more than adult females. Highest level in males 15-25 years - most likely group to commit violent crimes.
Reducing T levels by castration often used to reduce aggression in pet, farm and zoo animals. Throughout history, servants/slaves castrated to make them sager to royal court.
If individual has high levels of T, activity in orbito-frontal cortex reduced - in an emotional situation, could be heightened emotionally aggressive response.
T influences activity of seratonin in brain - can reduce serotonergenic activity. Low levels of this implicated in increased aggressive behaviour. Appears T doesn't just have effect in isolation, but mediayes the effects of other biochemicals too
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