Studied the effects of winning or losing on subsequent aggressive behavior in male and female rats. By using 3 strains with different levels of aggression (40 WEzob, 40 S3, and 40 Wistar), a procedure was developed to create winners and losers. Subsequently, winners were tested against losers. Behavioral analysis of all tests enabled a thorough study of these processes and of their consequences. Results (1) indicate that significant and relatively permanent behavioral changes were induced in intact and castrated, testosterone-treated males but not in females and (2) suggest that behavioral inhibition is a specific characteristic of the male's agonistic behavioral repertoire. (30 ref)
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