Behavioral control by stimuli associated with acquisition of morphine self-administration.
D000161:Acoustic Stimulation; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003216:Conditioning, Operant / Q000187:drug effects; D005108:Extinction, Psychological; D007279:Injections, Subcutaneous; D008297:Male; D009020:Morphine / Q000008:administration & dosage* / Q000494:pharmacology; D051381:Rats; D012054:Reinforcement, Psychology
D009020:Morphine