title: Establishing tokens as conditioned reinforcers with long-stay psychiatric patients.
mesh_terms: D002908:Chronic Disease; D003216:Conditioning, Operant; D006801:Humans; D008297:Male; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D012559:Schizophrenia / Q000503:physiopathology*; D013997:Time Factors; D014705:Verbal Behavior