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The extinction session for Experiment 2. The duration of each noise presentation was 6, 12 or 24s. A, Response rate during the pre-CS periods. B-D, Responding during the CS periods. Response rate was calculated using the entire CS duration (B), using only the first 6 s of each CS presentation (C), or using only the last 6s of each CS presentation (D). Error bars represent ±1 SEM.
