The Ravens Standard Progressive Matrices Test was administered to 48 subjects who then performed a card-sorting task under single- and competing-task conditions. Hick's Law and the Roth-Jensen procedure were used in task development. Complexity should have a more central role in speed of processing models of intelligence than ability to divide…

Educable mentally retarded (EMR) and nonretarded (NR) adolescents verified superordinate and basic level descriptions of common objects. Results suggest that EMR subjects had difficulty making semantic classification decisions in general. Other results suggest that group differences in semantic processing speed were related to the deliberate…

This article presents an analysis of patterns of giftedness based on the triarchic theory of intelligence. The analysis distinguishes among seven different patterns of giftedness and includes: the Analyzer, the Creator, the Practitioner, the Analytical Creator, the Analytical Practitioners, the Creative Practitioner, and the Consummate Balancer.…

A study of 62 children (ages 7 to 12) with attention-deficit hyperactivity disorder (ADHD) and 62 controls found that behavioral variables established robust, statistically significant differences between groups. Children with ADHD also scored worse on 31 out of 61 neuropsychological variables, but obtained better scores on WISC-R Comprehension…

Using cluster analysis, a study empirically divided 54 children with attention-deficit/hyperactivity disorder (ADHD) based on their Full Scale IQ and reading ability. Clusters had different patterns of cognitive, behavioral, and neurochemical functions, as determined by discrepancies in Verbal-Performance IQ, academic achievement, parent…