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¡¶Hormonal Mechanisms for Regulation of Aggression iin Human Coalitions¡·
(1) adult and adolescent males do not elevate testosterone when they defeat their friends, but they do elevate testosterone when they defeat outsiders;
(2) pre-competition testosterone and cortisol levels are negatively associated with strength of coalitionary ties; and
(3) adult males usually elevate testosterone when interacting with adult women who are potential mates, but in a striking reversal, they have lower testosterone if the woman is a conjugal partner of a close friend. These naturalistic studies hint that reciprocity, dampening of aggression, and competition among friends and allies may be biologically embedded in unique ways among humans
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