A longitudinal assessment of diverging verbal and non-verbal abilities in the Williams syndrome phenotype

C Jarrold, Alan Baddeley, A K Hewes, C Phillips

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)423-31
Number of pages9
Issue number3
Publication statusPublished - 2001


  • Adolescent
  • Adult
  • Child
  • Cross-Sectional Studies
  • Female
  • Follow-Up Studies
  • Humans
  • Language Disorders
  • Male
  • Speech Perception
  • Verbal Behavior
  • Vocabulary
  • Williams Syndrome

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