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. 2006 Nov 7;103(47):18020–18025. doi: 10.1073/pnas.0608398103

Fig. 1.

Fig. 1.

Immediate or delayed extinction after fear conditioning. (A) Freezing behavior on the conditioning day. Data are 1-min averages for the period before (baseline, BL) and after each of five tone–shock conditioning trials. (B) Freezing behavior during the extinction session, which occurred either 15 min (IMMED) or 24 h (DELAY) after conditioning. Control rats did not receive CS presentations during extinction (NO-EXT). (C) Freezing behavior during the retention test 48 h after conditioning. (D) Baseline freezing data were averaged and subtracted from the average freezing across test trials to yield normalized freezing for the retention test data shown in C. All data are means ± SEM. ∗, P < 0.05.