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The number of active and inactive lever presses in rats that acquired and maintained cocaine (0.5 mg/kg/infusion) self-administration (left panels: a, c, e) and animals that underwent 10-day extinction training (right panels: b, d, f) with their yoked controls that received passive infusions of cocaine or saline. Data are presented as the mean ± SEM from 8 rats/group, ***p < 0.0001 versus inactive lever
