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- W2040804948 abstract "Castrated male hooded rats were given electrolytic lesions of the medial hypothalamus or sham lesions. Another group of castrated rats was implanted subcutaneously with bilateral testosterone-filled Silastic capsules or empty capsules. Lesioned animals with a high defensiveness (reactivity) score toward the experimenter were each placed in a cage with a sham-lesioned animal of a similar weight. Animals with testosterone implants were likewise housed with an animal of similar weight without a testosterone implant. Following a period of adaptation to a 23-hr water deprivation schedule, each pair of rats was given daily competition tests on each of 6 days. During the tests, a single water spout was placed in the cage for a 4-min period. The spout was surrounded by a plastic ring which prevented more than one animal from drinking at any time. Access to an unencumbered water spout was present following the competition test for 1-hr each day. Rats with medial hypothalamic lesions displayed more aggression than sham-lesioned rats during the competition tests and were able to spend more time drinking. Rats with testosterone implants were more successful in maintaining access to the spout but did not consistently display more aggression than their cagemates without testosterone implants. The aggression of the lesioned rats was defensive while that of animals with testosterone implants corresponded to intermale social aggression. These results demonstrate that a competitive situation can elicit intermale social aggression mediated by testosterone and defensiveness induced by medial hypothalamic lesions." @default.
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- W2040804948 date "1987-01-01" @default.
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- W2040804948 title "Competitive behavior in male rats: Aggression and success enhanced by medial hypothalamic lesions as well as by testosterone implants" @default.
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- W2040804948 doi "https://doi.org/10.1016/0031-9384(87)90270-8" @default.
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