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Related Experiment Videos

Parietal function in good and poor readers.

Robin Laycock1, Sheila G Crewther, Patricia M Kiely

  • 1School of Psychological Science, La Trobe University, Bundoora, Victoria, 3086, Australia. r.laycock@latrobe.edu.au

Behavioral and Brain Functions : BBF
|August 2, 2006
PubMed
Summary

Parietal cortex function in developmental dyslexia (DD) appears to be linked more to nonverbal intelligence than reading ability. However, a task traditionally linked to ventral stream functions showed a stronger correlation with reading accuracy in children with DD.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Developmental dyslexia (DD) is often associated with impaired magnocellular pathway function.
  • Limited research has explored parietal cortex function, a key projection of this pathway, in relation to nonverbal intelligence in DD.
  • New visual processing theories prompt investigation into whether parietal functions are equally impaired and their relation to general ability versus reading skills.

Purpose of the Study:

  • To investigate parietal cortex function in children with developmental dyslexia (DD).
  • To compare parietal function in DD with reading-age matched and chronological-age matched controls with varying nonverbal IQ.
  • To determine if parietal performance is more closely related to nonverbal ability or reading accuracy.

Main Methods:

Related Experiment Videos

  • Compared reading accuracy and psychophysical tasks (motion sensitivity, attentional tracking, spatial localization) in 17 children with DD.
  • Included 16 reading-age matched (RA) controls and 46 chronological-age (CA) matched good readers (divided by nonverbal IQ).
  • Utilized tasks purported to selectively activate parietal cortex.

Main Results:

  • No significant differences in parietal tasks between DD and CA controls, though DD group had lower nonverbal IQ.
  • Parietal function improved with age, as expected.
  • DD and age-nonverbal IQ matched groups showed no performance difference on parietal tasks; however, performance differentiated DD from age-matched, higher IQ groups.
  • Chromatic sensitivity, a ventral stream task, differed between lower and higher reading age groups, unlike parietal tasks.

Conclusions:

  • Parietal function performance appears to improve with age and correlate more with nonverbal mentation than reading accuracy.
  • A cognitively demanding task, typically associated with ventral stream functions, showed a stronger relationship with reading accuracy.
  • Findings suggest distinct neural underpinnings for parietal and ventral stream functions in relation to developmental dyslexia.