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Visual and language processing deficits are concurrent in dyslexia

W L Slaghuis1, W J Lovegrove, J A Davidson

  • 1Department of Psychology, University of Tasmania, Hobart, Australia.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 1, 1993
PubMed
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Dyslexia involves both visual and language processing issues. This study found that dyslexic individuals often exhibit deficits in visual processing and phonological coding, confirming a dual deficit.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Dyslexia is characterized by language processing difficulties.
  • Emerging research suggests a co-occurring low-level visual information processing deficit in dyslexia.
  • Limited evidence exists on the simultaneous visual and language processing dysfunction in dyslexic individuals.

Purpose of the Study:

  • To investigate the extent of concurrent visual and language processing deficits in dyslexia.
  • To compare visual processing, phonological coding, and language comprehension in dyslexic and normal readers.

Main Methods:

  • Compared 35 dyslexic and 35 normal readers (aged 7.9-14 years).
  • Assessed visual processing using the slope of visible persistence as a function of spatial frequency.

Related Experiment Videos

  • Evaluated language processing via a phonological coding test (Non-Word test) and a language comprehension test (Token Test).

    • Main Results:

    • Visual processing scores significantly predicted group membership (91% of dyslexic vs. 20% of normal readers had low scores).
    • The Non-Word test perfectly identified all dyslexic subjects as having phonological coding deficits.
    • The Token Test did not differentiate between dyslexic and normal readers.

    Conclusions:

    • The findings provide evidence for the co-occurrence of visual and language deficits in dyslexia.
    • Phonological coding deficits are a consistent marker of dyslexia.
    • Language comprehension, as measured by the Token Test, may not be a distinguishing factor in this population.