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Aggression:
Under the section "Aggression and culture"
Changes in dominant behavior or in social status causes changes in testosterone levels. Reports of changes in testeosterone of young men during athletic events, which involove face-to-face competition with a clear winner and loser, reveal that testosterone rises shortly before their matches, as if in anticipation of competition. Also, one to two hours after the competitive match, the testosterone levels of the winners are high relative to those levels of the losers (