Trends in intellectual development, and diverging verbal and non-verbal abilities in the Down syndrome phenotype
Date Issued
2009
Date
2009
Author(s)
Chang, Lih-Maan
Abstract
Background Previous foreign studies revealed that the IQ in Down syndrome (DS) declines with age, but not any investigation of domestic data in Taiwan was available. Individuals with DS are characterized by limited verbal development, and in this article, authors look into the diverging verbal-nonverbal abilities in the DS phenotype.ethod The present study investigated this by analysis the test results of development /intelligence scales of 57 people with DS (34 females, 23 males; mean age 8 years 3 months). To compare initial cross-sectional data with longitudinal follow-up, 12 in 57 people were included (8 females, 4 males; initial mean age 4 years 6 months, follow-up mean age 6 years 9 months).esults 1) Female subjects had higher verbal IQ, but no significant gender differences in nonverbal IQ and full-scale IQ; 2) IQs declined with age, that came up before age 5 years; 3) There was a significant increase in mental age (MA) of visuospatial function at follow-up, but no such increases was found in MA of verbal subscale(s). Besides, there was a positive correlation between follow-up age interval and verbal-nonverbal divergence, but not be statistically significant.
Subjects
Down syndrome
IQ
mental age
neuropsychological function
genetic counseling
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