Memory destabilization is critical for the success of the reactivation–extinction procedure

Experiment 2. (A) Experimental protocol. Seventy-two hours after contextual fear conditioning, rats were exposed to training context for 15 min without shock (extinction group) or remained untreated (control group). Both groups were evaluated 24 h later in a 5-min test session and again 7 d later in a retest session. (B) Data represent the mean ± SEM of percentage time spent freezing during extinction training for the extinction group. (C) Data showing the mean ± SEM of percentage time spent freezing during test and retest, for both groups.