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The US retrieval-extinction procedure disrupted remote fear memory in humans. (A) Experimental design and timeline. (B) Mean differential SCR (CS+ minus CS−) during acquisition (late phase), extinction (last trial), test for spontaneous recovery (first trial), and reinstatement (first trial). No spontaneous recovery or reinstatement was found. *p < .05, comparison between acquisition and extinction (within-group). The data are expressed as mean ± SEM (n = 15).
