title: Enhancement of drug-seeking behavior by environmental stimuli associated with cocaine or morphine injections.
mesh_terms: D000818:Animals; D001070:Appetitive Behavior / Q000187:drug effects*; D003042:Cocaine / Q000494:pharmacology*; D003216:Conditioning, Operant / Q000187:drug effects; D004777:Environment; D000882:Haplorhini; D009020:Morphine / Q000494:pharmacology*; D012055:Reinforcement Schedule; D012453:Saimiri
chemical_list: D009020:Morphine; D003042:Cocaine