title: Discriminable properties of drugs and state-dependent learning. Introduction.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003213:Conditioning, Psychological / Q000187:drug effects; D004193:Discrimination Learning / Q000187:drug effects; D006801:Humans; D007858:Learning / Q000187:drug effects*; D008568:Memory / Q000187:drug effects; D008954:Models, Biological; D011600:Psychopharmacology; D012107:Research Design