Fig. 6.

Muscimol infusion into the dorsal hippocampus does not disrupt the performance of freezing (experiment 3). Mean ± SEM percentage of freezing during the first minute after tone onset during the retrieval test. The rats were tested 20–25 min after an intrahippocampal infusion of either muscimol (MUS, open bar) or saline (SAL, filled bar). The retrieval test was conducted after 5 d of exposure to the extinction contexts (contexts B and C) in the absence of CS-alone trials. As before, all rats received fear conditioning in context A.