When testosterone rises after a challenge, it doesn't prompt aggression. Instead it prompts whatever behaviors are needed to maintain status. This changes things tremendously... Engineer social circumstances right, and boosting testosterone levels during a challenge would make people compete like crazy to do the most random acts of kindness. In our world riddled with male violence, the problem isn't that testosterone can increase levels of aggression. The problem is the frequency with which we reward aggression.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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