title: "Superstition": the effects of independent and contingent events on free operant responses in retarded children.
mesh_terms: D000293:Adolescent; D002648:Child; D003216:Conditioning, Operant; D005108:Extinction, Psychological; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D009043:Motor Activity; D012055:Reinforcement Schedule; D012201:Reward; D013239:Stereotyped Behavior; D014159:Transducers