Abstract
We investigated the effects of social instability stress (daily 1-hr isolation, change of cage partner, postnatal day 30-45) in adolescence in male rats on open field exploration and social behavior in adulthood. Social stressed rats had longer latencies to enter the center of an open field and then took longer to approach an object placed in the center of the field. When another rat was placed in the open field, stressed rats spent less time in social interaction than control rats, particularly when paired with another stressed, rather than a control, rat. The groups did not differ in social approach tests (when a stimulus rat was separated by wire mesh) nor in novel object exploration (when controlling for open field anxiety). The results suggest social stress in adolescence increases open field anxiety while maintaining exploratory behavior, and alters social interactions in adulthood.
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