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Operant conditioning (mean ± SEM). (A–C) Total correct lever presses, nose pokes and locomotor activity are shown for each of the 10 days of acquisition. *p < 0.01 significant effect of day. (D–F) Total correct lever presses, nose pokes and locomotor activity are shown for the 60-min test. *p < 0.05 compared to the 28-day abstinence period.
