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Cocaine self-administration was assessed when participants (n = 4) were exposed to: (1) cocaine-paired cues and an active dose (12 mg) of cocaine (+cue,+prime), cocaine-paired cues and placebo cocaine (+cue,−prime), or neither the cues or cocaine (−cue,−prime). Participants purchased up to five doses of cocaine (12 mg) per session using actual study earnings.Three cost conditions were tested: $5, $10, $15 per dose of cocaine.
