title: Reward frequency and choice behavior in naive and sophisticated monkeys and mentally retarded children.
mesh_terms: D000818:Animals; D001244:Association; D002648:Child; D002675:Child, Preschool; D004193:Discrimination Learning; D005260:Female; D000882:Haplorhini; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D012201:Reward