Testosterone and aggression are positively related among both men and women.
Although testosterone increases male-male violence in a number of avian and mammal species, it has been proposed that testosterone promotes both violent and nonaggressive behaviors in male humans that improve social standing.
But there isn't enough causal data to tell these hypotheses apart. In this study, we used a double-blind, randomized design to evaluate these hypotheses in men who received testosterone or a placebo injection. Participants engaged in a modified Ultimatum Game that gave them the option of rewarding or punishing the opposing player. Increased punishment of the opposing player was brought on by testosterone administration, although greater offers were also rewarded more frequently. These findings support the social status theory in men by demonstrating that testosterone can influence male prosocial behavior.
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