title: Analysis and modification of opiate reinforcement. Discussion.
mesh_terms: D000328:Adult; D001521:Behavior Therapy; D004328:Drive; D004644:Emotions / Q000187:drug effects; D005500:Follow-Up Studies; D006556:Heroin Dependence / Q000209:etiology / Q000534:rehabilitation*; D006801:Humans; D008875:Middle Aged; D009042:Motivation; D009292:Narcotic Antagonists / Q000627:therapeutic use*; D012008:Recurrence; D012054:Reinforcement, Psychology; D012931:Social Environment
chemical_list: D009292:Narcotic Antagonists