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The relative conditioned reinforcing value attributed to the lever CS vs. the tone CS during drug-free tests following 2-CS PCA acquisition. Mean (±SEM) number of (A) active nosepokes, which produced the previously learned stimulus (i.e., lever or tone, depending on test-day), and (B) inactive nosepokes, which resulted in no consequences, for saline pretreated groups and MK-801 (0.1 mg/kg) pretreated groups during 2-CS PCA acquisition.
