Fig. 5.

Arousing fear before delayed extinction. (A) Freezing behavior on the conditioning day. Data are 1-min averages for the periods before (baseline, BL) and after each of five tone–shock conditioning trials. (B) Freezing behavior during the extinction session. Extinction training was conducted in the context in which the rats had been conditioned a day earlier. Fifteen minutes before the extinction session, rats received either five unsignaled footshocks (SHOCK) in a novel context or exposure without shock (NO-SHOCK) in that context. Control rats did not receive CS presentations during extinction (NO-EXT). (C) Freezing behavior during the retention test 48 h after conditioning. All data are means ± SEM. ∗, P < 0.05.