Comparison of the mental status of 30 subjects with Down's Syndrome mosaicism and 30 matched subjects with trisomy 21 Down's Syndrome found that the mean intelligent quotient of the mosaic Down's Syndrome group was significantly higher and that this group showed better verbal abilities and more normal visual-perceptual skills. (Author/DB)

Data from the Japanese standardization of the Wechsler Preschool and Primary Scale for Intelligence were used to analyze the structure of abilities of Japanese children in terms of the Burt-Vernon hierarchical model of intelligence. It was suggested that the pattern of cognitive strengths and weaknesses that emerged would help clarify a number of…