title: Stimuli previously associated with reinforcement: reinforcing or frustrating to the mentally retarded?
mesh_terms: D000293:Adolescent; D000328:Adult; D003216:Conditioning, Operant; D003463:Cues; D004328:Drive; D005639:Frustration; D006801:Humans; D008607:Intellectual Disability; D008027:Light; D008297:Male; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D012201:Reward; D014796:Visual Perception