title: Longitudinal development of object permanence in mentally retarded children: an exploratory study.
abstract: Monthly testing on a series of Piaget object tasks was carried out on 1- to 6-year-old profoundly, severly, and moderately retarded children. Forty nine subjects were followed for 1 to 1.5 years or to criterion; 18 subjects were followed for shorter periods. Three general patterns occurred among the noncriterion subjects with approximately equeal frequency: (a) little or no change, (b) marked variability, and (c) relatively steady upward change from month to month. Criterion and upward subjects skipped certain substages about one-half of the time. Degree of retardation, CA, and diagnostic concomitants of these observations were discussed.
mesh_terms: D000015:Abnormalities, Multiple / Q000150:complications; D000367:Age Factors; D001927:Brain Diseases / Q000150:complications; D002648:Child; D002657:Child Development; D002674:Child, Institutionalized; D002675:Child, Preschool; D003071:Cognition; D003410:Cri-du-Chat Syndrome / Q000150:complications; D004314:Down Syndrome / Q000150:complications; D004569:Electroencephalography; D006801:Humans; D006849:Hydrocephalus / Q000150:complications; D000860:Hypoxia / Q000150:complications; D007223:Infant; D008607:Intellectual Disability / Q000209:etiology; D009769:Object Attachment; D011582:Psychological Theory; D012640:Seizures / Q000150:complications