title: Brain substrates for reinforcement and drug self-administration.
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects / Q000502:physiology*; D002395:Catecholamines / Q000502:physiology; D006801:Humans; D009020:Morphine / Q000494:pharmacology; D009043:Motor Activity / Q000187:drug effects; D009294:Narcotics / Q000494:pharmacology; D012201:Reward; D012646:Self Administration; D012653:Self Stimulation; D019966:Substance-Related Disorders
chemical_list: D002395:Catecholamines; D009294:Narcotics; D009020:Morphine