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(A) Training protocol, Experiment 2. (B) Animals extinguished at intervals of 10 min, 1 h, 24 h, or 72 h after fear acquisition exhibited differential susceptibility to renewal. Shown are mean (+/− SEM) fear-potentiated startle difference scores to a light CS in context A following extinction training in either context A (denoted “AAA”) or context B (denoted “ABA”). Significant differences (P < 0.05) are indicated by an asterisk.
