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Down syndrome: cognitive phenotype.

Wayne Silverman1

  • 1Department of Behavioral Psychology, Kennedy Krieger Institute, Baltimore, Maryland 21205, USA. silvermanw@kennedykrieger.org

Mental Retardation and Developmental Disabilities Research Reviews
|October 3, 2007
PubMed
Summary
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Individuals with Down syndrome (DS), a genetic condition from trisomy 21, often show specific cognitive weaknesses. Research highlights challenges in expressive language, syntax, and verbal memory, impacting development.

Area of Science:

  • Genetics
  • Developmental Psychology
  • Neurology

Background:

  • Down syndrome (DS) is the most common genetic cause of intellectual disability.
  • It results from trisomy 21, affecting physical and cognitive development.
  • Individuals with DS exhibit a range of impairment severity.

Purpose of the Study:

  • To review cognitive characteristics in Down syndrome.
  • To identify specific areas of relative weakness.
  • To explore potential underlying mechanisms and intervention implications.

Main Methods:

  • Systematic review of studies on Down syndrome cognitive profiles.
  • Analysis of cognitive performance relative to overall intellectual disability.
  • Examination of language and memory processing.

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Main Results:

  • Cognitive performance in DS is largely predictable by intellectual disability.
  • Consistent relative weaknesses observed in expressive language, syntactic/morphosyntactic processing, and verbal working memory.
  • Uneven cognitive deficits suggest potential issues with automatic speech processing.

Conclusions:

  • The specific cognitive profile in Down syndrome, particularly language and memory, warrants targeted intervention.
  • Failure in developing automatic speech processing may underlie observed deficits.
  • Further research should explore these implications for therapeutic strategies.