Compared to children matched for mental or chronological age, 12 autistic children (ages 10-17) showed frontal lobe processing problems on neuropsychological tests. Subjects made more errors on the Wisconsin Card Sorting Test and the Milner Maze and took longer to complete the maze but copied a complex figure as accurately and speedily as…

This study found that 16 preschoolers with Down's syndrome attained higher age equivalents and standard scores in "socialization" than did 16 preschoolers with autism. Adaptive age equivalent was positively related to chronological age for children with Down's syndrome in all domains, but only in "communication" for children with autism.…

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)

Three studies examined proximity and contact behaviors (behaviors generally thought to be indicative of attachment relationships) in young autistic children. The first study examined the behavior of 32 young autistic children and children with pervasive developmental disorders (PDD) in a "strange situation" paradigm using four…

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)

Thirty children (under 24 months of age) referred to an early intervention program were administered 3 developmental assessments. Although the Griffiths' Mental Development Scales correlated well with the Bayley Scales of Infant Development and the Battelle Developmental Inventory, the Griffiths' age equivalents were considerably higher than the…

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)

This study of 28 girls (ages 2-19) with Rett Syndrome found profound handicaps in the intellectual and adaptive areas, according to standardized tests. Subjects seemed capable of learning some self-help skills at a basic level. The Cattell Mental Age was significantly negatively correlated with chronological age. (JDD)