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Related Experiment Videos

Clock drawing in developmental dyslexia.

Guinevere F Eden1, Frank B Wood, John F Stein

  • 1Department for Pediatrics, Georgetown University Medical Center, Washington, DC 20057, USA. edeng@georgetown.edu

Journal of Learning Disabilities
|November 2, 2004
PubMed
Summary
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Developmental dyslexia involves more than language deficits. The Clock Drawing Test reveals right-hemisphere spatial construction issues in children with dyslexia, suggesting compounded processing deficits.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Developmental dyslexia is primarily viewed as a language-based reading impairment.
  • Nonlinguistic deficits in dyslexia are under-researched, particularly those related to the dorsal visual pathway.
  • Clinically applicable tests for nonlinguistic deficits in dyslexia are scarce.

Purpose of the Study:

  • To investigate visuoconstructive abilities in children with and without dyslexia using the Clock Drawing Test (CDT).
  • To explore potential right-hemisphere involvement in dyslexia beyond phonological processing deficits.
  • To assess the utility of the CDT as a tool for identifying nonlinguistic deficits in dyslexia.

Main Methods:

  • The Clock Drawing Test (CDT) was administered to children with and without dyslexia and garden-variety poor readers.

Related Experiment Videos

  • Visuoconstructive abilities were assessed by analyzing the spatial distribution of drawn figures on the clock face.
  • Performance was compared between typically reading children, children with dyslexia, and poor readers.

    • Main Results:

    • Children with dyslexia and some poor readers exhibited significant left neglect on the CDT.
    • Spatial construction deficits observed in poor readers with dyslexia resembled those in patients with acquired right-hemisphere lesions.
    • These findings suggest potential right-hemisphere dysfunction contributing to reading impairments in some children with dyslexia.

    Conclusions:

    • The Clock Drawing Test (CDT) can identify nonlinguistic, spatial construction deficits in children with dyslexia.
    • Right-hemisphere dysfunction may exacerbate left-hemisphere phonological processing deficits in dyslexia.
    • The CDT is a practical tool for assessing right-hemisphere parietal function in clinical and research settings for children.