title: Effects of morphine on a quickly learned conditioned suppression in rats.
mesh_terms: D000647:Amnesia; D000818:Animals; D001007:Anxiety; D001522:Behavior, Animal / Q000187:drug effects*; D003213:Conditioning, Psychological / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009043:Motor Activity; D051381:Rats
chemical_list: D009020:Morphine