Abstract
Rats were trained on a one-trial inhibitory (passive) avoidance task. Five seconds after the offset of the training footshock, animals received unilateral, subseizure electrical stimulation of the amygdala. When compared to either implanted or unimplanted control animals, those animals which received posttrial amygdala stimulation had a significant retention deficit. Histological examination of electrode placements indicated that maximal interference with retention was produced by stimulation of a small region of the amygdala in or near the basomedial nucleus. Increases in the stimulation train duration from 10 to 30 sec increased the degree of the retention deficit produced by the stimulation.
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