Robust renewal after extinction of remotely acquired Pavlovian conditioning

Experiment 2 conditioning and extinction. (A) Mean percent freezing in conditioning during the 20 sec tone CS presentations that preceded footshock and the baseline period. (B) Mean percent freezing during the first five trials of each extinction session and the baseline period of each session. For both graphs, baseline represents the 3 min period prior to the onset of the first CS. Error bars represent ±SEM.