Abstract
Jarrold et al. (1998) presented evidence to suggest that verbal and non-verbal abilities develop at different rates in individuals with the Williams syndrome phenotype. However, this evidence was derived from cross-sectional rather than longitudinal data. The current report presents data from a series of follow up assessments which examine the development of vocabulary and pattern construction abilities in 15 of the original sample of 16 individuals, over a 40 month period. The results confirm the original predictions, as mental age equivalent scores for vocabulary increase more rapidly than scores for the pattern construction test; a finding, which appears unlikely to be due to practice effects.
Original language | English |
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Pages (from-to) | 423-31 |
Number of pages | 9 |
Journal | Cortex |
Volume | 37 |
Issue number | 3 |
Publication status | Published - 2001 |
Keywords
- Adolescent
- Adult
- Child
- Cross-Sectional Studies
- Female
- Follow-Up Studies
- Humans
- Language Disorders
- Male
- Speech Perception
- Verbal Behavior
- Vocabulary
- Williams Syndrome