title: Central cholinergic influence on self-administration of morphine and amphetamine.
mesh_terms: D000818:Animals; D001285:Atropine / Q000494:pharmacology*; D001286:Atropine Derivatives; D001522:Behavior, Animal / Q000187:drug effects*; D003213:Conditioning, Psychological / Q000187:drug effects; D003913:Dextroamphetamine / Q000494:pharmacology*; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D012054:Reinforcement, Psychology / Q000187:drug effects*
chemical_list: D001286:Atropine Derivatives; D009020:Morphine; D001285:Atropine; D003913:Dextroamphetamine