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Average (±SEM) number of trials to master five discriminations (Repeated Acquisition [RA], open bars) and subsequent reversals (Discrimination Reversal [DR], filled bars) during probe sessions conducted before cocaine exposure (C), following each 30th session of cocaine self-administration, and after a 30-d washout (abstinence) period (Ab) (n=6). (*p<.05; **p<.01; ***p<.001)
