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Executive function in Down syndrome: A meta-analysis.

Andrew S Tungate1, Frances A Conners1

  • 1The University of Alabama, Department of Psychology, Box 870348, Tuscaloosa, AL, 35487-0348, USA.

Research in Developmental Disabilities
|December 19, 2020
PubMed
Summary
This summary is machine-generated.

Individuals with Down syndrome (DS) exhibit significant executive function (EF) challenges, particularly in working memory and shifting. This meta-analysis confirms EF deficits in DS, highlighting specific areas for targeted interventions.

Keywords:
Developmental disabilityDown syndromeExecutive functionInhibitionIntellectual disabilityShiftingShort-term memoryWorking memory

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Area of Science:

  • Cognitive Neuroscience
  • Developmental Psychology
  • Genetics

Background:

  • Executive functions (EF) are crucial cognitive processes for goal-directed behavior, including inhibition, attention shifting, and working memory.
  • Down syndrome (DS) is frequently associated with EF difficulties, though the precise nature of these challenges remains unclear.

Purpose of the Study:

  • To systematically evaluate and confirm executive function (EF) as an area of deficit in individuals with Down syndrome (DS).
  • To delineate a specific EF profile in DS through meta-analytic methods.

Main Methods:

  • A random-effects meta-analysis synthesized data from 57 studies.
  • Compared individuals with DS to typically developing (TD) mental age-matched controls on various EF tasks.
  • Analyzed heterogeneity and moderators to identify patterns in EF performance.

Main Results:

  • A large overall effect size (d = -0.87) indicated significantly poorer EF in individuals with DS compared to TD groups.
  • Moderator analysis revealed a distinct EF profile: very large deficits in verbal working memory/short-term memory (WM/STM), large deficits in shifting, and moderate deficits in inhibition and nonverbal WM/STM.
  • Skewness analysis suggested potential underestimation of effect sizes, particularly for WM/STM and shifting.

Conclusions:

  • Individuals with Down syndrome demonstrate pronounced difficulties across executive function domains.
  • Findings underscore the need for tailored interventions and further research to address EF challenges in DS.