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(a) Freezing rates of vehicle-treated rats exposed to the footshock experience (Exp) but not subjected to the extinction sessions (No-EXT) and of rats exposed to the extinction sessions (EXT 1, 2, and 3), as assessed during the extinction retention test (ERT) or retention test (RT) on day 16. (b) Social interaction (SI) time of No-EXT and EXT rats during the SI test on day 17. (**P<0.01 vs the No-EXT group.) Data are expressed as mean+SEM (n=10 per group).
