Compared 24 educable mentally retarded (EMR) adolescents, 24 chronological age (CA) matched nonretarded adolescents, and 24 mental age (MA) matched children in same-different decision task in which dyadic sequences were presented within and across visual and auditory modalities. Results supported concept of greater visual dominance by retarded and…

Forty children with mental retardation were compared on everyday leisure-time behaviors with children without mental retardation matched for mental age (MA) or chronological age (CA). Although MA best predicted overall functioning on leisure-time behavior, CA best predicted both single highest behavior performed and highest behavior considered too…

This study, involving 48 children and adolescents with Down's syndrome, found that chronological age and mean mental age collectively accounted for much of subjects' variability in vocabulary comprehension and syntax comprehension, with total passes on a hearing screening accounting for additional variability. (Author/DB)

Forty-nine children (ages 8-17) with mental retardation recognized facial expressions less accurately than did subjects without retardation who were matched on chronological age. Mental age-matched groups showed no differences in accuracy at a younger mental age, but a difference was found at an older mental age. (Author/JDD)

Sixteen individuals with autism and sixteen with Down's Syndrome, aged 10-29, were matched for verbal mental age. The groups' scores did not differ on the Vineland Adaptive Behavior Scales. However, the adaptive skills of Down's Syndrome individuals kept pace with mental age, while the skills of autistic subjects did not change. (Author/JDD)