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Electrophysiological recording procedures were used to examine nucleus accumbens (Acb) cell firing in rats (N=13) during cocaine self-administration sessions consisting of three phases. In phase one (maintenance), each lever press resulted in an intravenous cocaine infusion (0.33 mg, 6 s) paired with a tone-houselight stimulus (20 s). Of 144 Acb cells recorded during maintenance, 39 neurons (27%)...
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