title: Conditioning of activity level in a classroom with institutionalized retarded boys.
mesh_terms: D001288:Attention; D001521:Behavior Therapy; D002648:Child; D003216:Conditioning, Operant; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D006948:Hyperkinesis / Q000628:therapy; D008607:Intellectual Disability / Q000628:therapy*; D008297:Male; D009043:Motor Activity; D012054:Reinforcement, Psychology; D013663:Teaching