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Visual and language processing disorders are concurrent in dyslexia and continue into adulthood

W L Slaghuis1, A J Twell, K R Kingston

  • 1Department of Psychology, University of Tasmania.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|September 1, 1996
PubMed
Summary

Dyslexia involves concurrent visual and language processing differences. These differences, including issues with visible persistence and phonological coding, are present in both young and adult dyslexic individuals.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Developmental Psychology

Background:

  • Previous research indicated concurrent visual and language processing differences in preadolescent dyslexics.
  • This study investigates the persistence of these differences into adulthood.

Purpose of the Study:

  • To examine the concurrence and continuity of visual and language processing differences in young and adult dyslexics.
  • To assess visual processing using Ternus apparent movement and language processing via phonological coding tasks.

Main Methods:

  • Two experiments were conducted involving young and adult dyslexic and normal readers.
  • Visual processing was measured using Ternus apparent movement to assess visible persistence.
  • Language processing was evaluated using a non-word pronunciation test for phonological coding ability.

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Main Results:

  • Young dyslexics showed reduced Ternus 'group movement' and impaired non-word pronunciation compared to controls.
  • Adult dyslexics exhibited similar reductions in Ternus 'group movement' and non-word pronunciation.
  • Reduced 'group movement' was linked to increased visible persistence, suggesting a transient system disorder.

Conclusions:

  • Visual and language processing differences are concurrent in dyslexia.
  • These differences persist from childhood into adulthood in individuals with dyslexia.
  • Findings support the hypothesis of a transient system disorder contributing to dyslexia.