The paper notes A. Hore and W. Tryon's support of the developmental position that persons with and without mental retardation of similar mental age show similar cognitive patterns, but suggests that mental age is psychometrically invalid and Piagetian tasks are inappropriate to evaluate this position. An information processing approach is…

Verbal short-term memory, as measured by digit or word span, is generally impaired in individuals with Down's syndrome (DS) compared to mental age-matched controls. Moving from the working memory model, the present authors investigated the hypothesis that impairment in some of the articulatory loop sub-components is at the base of the deficient…

This pilot study was designed to examine mental rotation ability in individuals with Down syndrome. 7 individuals with Down syndrome (mean mental age = 8.18 +/- 2.73 years; mean chronological age = 29.8 +/- 5.4 years) and a group of 9 typically developing children, matched for mental age, (mean mental age = 8.40 +/- 1.73 years; mean chronological…

To evaluate the claim that correct performance on unexpected transfer false-belief tasks specifically involves mental-state understanding, two experiments were carried out with children with autism, intellectual disabilities, and typical development. In both experiments, children were given a standard unexpected transfer false-belief task and a…

Interpersonal problem-solving skills of 17 mildly retarded students and two groups of nonretarded subjects (Ns=30) matched on mental age (MA) and chronological age were assessed using hypothetical problem solving situations. Results indicated similarities between mentally retarded subjects and MA matched controls in types and number of strategies…

An Australian comparison study of 26 children (mean age=10) with mild intellectual disabilities, 26 typical children of approximately the same mental age, and 26 children of approximately the same chronological age, found no mean differences on problem-solving abilities between the children with intellectual disabilities and children of comparable…

Examined the relation between a history of maltreatment and cognitive control functioning in two groups of preschool and early school-age maltreated and nonmaltreated children. Maltreated children showed developmentally impaired cognitive control functioning on a number of tasks. (RH)

A comparison of 33 Australian adolescents with Down syndrome who did not receive early intervention services and 41 adolescents with Down syndrome who had received early intervention services found no significant difference between the two cohorts in cognitive functioning. Socioeconomic status, mothers' education, and gender were predictors of…

The literature on the moral judgment and moral development of mentally retarded individuals is reviewed. The relative contribution of mental age, chronological age, cognitive functioning, social experience, and environmental factors to the moral characteristics of this population is discussed. (Author/RM)