Abstract
It was found that animals with a hippocampal lesion developed high blood pressure, low heart rates, and high plasma corticosterone during social interaction in a territorial situation. However, hippocampal animals kept in a nonterritorial situation with minimal social interaction did not show significant cardiovascular or plasma corticosterone changes as compared to unoperated controls or cortically lesioned controls. The socially interacting hippocampal animals failed to develop a social hierarchy and did not respond aggressively to an intruder placed in the colony. The data suggests that the hippocampus is involved in the maintenance of social behavior which in turn may modulate autonomic nervous system activity.
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