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Mean saline reinforcers obtained (±SEM) in Experiment 4 across Extinction sessions collapsed across Sex and Social Condition for rats that had previously self-administered saline (0.00 mg/kg, Sal: squares) or nicotine at doses of 0.015 (triangles) or 0.03 (circles) mg/kg, IV. See Table 1 for n/condition. Asterisks (*) represent a decrease relative to both of the other groups, test of simple effects, ps<0.05.
