title: Discrete-trial choice procedure: effects of naloxone and methadone on choice between food and heroin.
mesh_terms: D000818:Animals; D002755:Choice Behavior / Q000187:drug effects*; D003657:Decision Making / Q000187:drug effects*; D005247:Feeding Behavior / Q000187:drug effects*; D000882:Haplorhini; D003932:Heroin / Q000008:administration & dosage*; D008297:Male; D008691:Methadone / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology*; D010215:Papio
chemical_list: D009270:Naloxone; D003932:Heroin; D008691:Methadone