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This experiment investigated the effects of social isolation during development and during adulthood on the topography of the shock-induced aggressive behavior of rats. Rats isolated during development from weaning to adulthood displayed more shock-induced biting than rats housed in groups during that period. Isolation during development did not affect the frequency of the upright boxing behavior, but isolation during adulthood reduced the frequency of the boxing response regardless of rearing conditions during development. 相似文献