title: Cognition and language in mental retardation: a reply to Balla and Zigler.
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003118:Color Perception; D003210:Concept Formation; D003463:Cues; D004193:Discrimination Learning; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability; D007361:Intelligence Tests; D007802:Language; D008568:Memory; D011214:Practice, Psychological; D011336:Probability; D011594:Psychometrics; D012054:Reinforcement, Psychology; D012193:Reversal Learning; D012858:Size Perception; D014163:Transfer, Psychology; D014705:Verbal Behavior