title: Establishing play behaviors in mentally retarded youth.
mesh_terms: D001143:Arousal; D001521:Behavior Therapy; D002648:Child; D002652:Child Behavior; D003479:Curriculum; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability / Q000628:therapy; D007858:Learning; D008960:Models, Psychological; D010989:Play Therapy; D010988:Play and Playthings; D011574:Psychoanalytic Theory; D012056:Reinforcement, Social