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Retention testing with a common extinction test interval. Shown is freezing behavior during the retention test 48 h after extinction. The extinction test interval was equated in rats that were extinguished either 15 min (IMMED) or 24 h (DELAY) after conditioning. Control rats did not receive CS presentations during extinction (NO-EXT). Data were normalized as in Fig. 1D. All data are means ± SEM. ∗, P < 0.05.
