Aggressiveness is positively related with the male sex hormone, testosterone. However, the effect of testosterone on aggression is stronger for lower animals than for humans. A dose of testosterone won't make a man more aggressive, but men with lower testosterone levels are less likely to aggress when provoked. Supercharging a portable tape player won't make it play faster, yet low batteries will make it play slower. There are also gender differences in aggression.
Provocation decreases gender differences in aggression.
Com Communications Inc.