title: Contingent time off to increase verbal behavior: a case report.
mesh_terms: D000293:Adolescent; D001291:Attitude of Health Personnel; D001521:Behavior Therapy; D003156:Community Mental Health Services; D006801:Humans; D008297:Male; D009155:Mutism / Q000628:therapy*; D012054:Reinforcement, Psychology; D012201:Reward; D012647:Self-Assessment; D014705:Verbal Behavior