Factor analyzed Wechsler Intelligence Scale for Children-Revised scores of low-IQ youths aged 9-11 and 14-16. Extracted Verbal Comprehension, Perceptual Organization and Freedom From Distractibility dimensions for each group. Coefficients of congruence indicated the two age groups were not similar on the Freedom From Distractibility factor.…

Administered the Raven Progressive Matrices (RPM) to (N=408) individuals in 100 family groups. Scores on all five subtests were highest in the 18-26 age group, decreasing with age. Males scored higher on each subtest in each age group. Performance on the RPM increased with additional years of education. (Author)

Platelet serotonin (5HT) levels of 5 autistic subjects (ages 16-37) who had siblings with either autism or pervasive developmental disorder were significantly higher than levels of 23 autistic subjects without affected siblings. Autistic subjects without affected siblings had 5HT levels significantly higher than 10 normal controls. Sex, age, and…

Investigates recall of toy preferences in the parents of 56 four-year-old children classified either as early readers or as nonreaders. Results indicated that early readers cannot be differentiated by IQ or family demographic information alone and that consistent toy preferences precede the acquisition of early reading skills. (Author/CI)

This study of 501 children and adults found that subjects with mental retardation or borderline intelligence were less proficient at identifying facial expressions of emotion than were children of average intelligence. Among individuals with mental retardation or borderline intelligence, recognition increased with intelligence quotient. Among…

British and Zambian children were compared on their abilities to reproduce patterns, from tactile and visual presentations, by modeling, drawing, and gesturing. Age, sex, and intelligence variables were analyzed. Results suggested that cross-cultural differences in these tasks reflect differences in specific perceptual skills rather than broad…

Although maladaptive and compulsive behaviors are increasingly well-described in young persons with Prader-Willi syndrome, it is unclear how these problems manifest in older adults with this syndrome. In Part I, I compared maladaptive and compulsive behaviors in 45 older adults with Prader-Willi syndrome (ages 30 to 50 years) to 195 children,…

The rod and frame performance of 70 children, 5 to 7 years of age, with respect to sex and age differences, reliability, and its relationship to general intelligence, was investigated. The rod and frame test was administered individually and again following a period of 35 to 69 days, at which time the Lorge Thorndike Intelligence Test, form 1A,…

This study investigated the accuracy and types of interpretations that fifth, eighth, and eleventh graders gave to 24 editorial cartoons in four issue areas and the effect of intelligence on political cartoon interpretation. Numerous misinterpretations and no interpretations indicates assumptions that cartoons are an effective teaching medium…