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Deep dyslexia is right-hemisphere reading.

M Coltheart1

  • 1Department of Psychology, Macquarie University, Sydney, New South Wales, 2109, Australia. max@currawong.bhs.mq.edu.au

Brain and Language
|March 16, 2000
PubMed
Summary

Deep dyslexia, a reading disorder, is debated: left hemisphere damage or right hemisphere processing. This study argues that right hemisphere involvement remains the most plausible explanation for deep dyslexia.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Deep dyslexia is an acquired reading disorder with two main interpretations.
  • One view posits damage to the left hemisphere's reading system.
  • An alternative hypothesis suggests reliance on right hemisphere processing for orthography and semantics.

Purpose of the Study:

  • To evaluate the interpretation of deep dyslexia.
  • To critically assess a recent brain-imaging study's claims regarding deep dyslexia.
  • To propose a refined right-hemisphere hypothesis for deep dyslexia.

Main Methods:

  • Review and re-analysis of a published brain-imaging study (Price et al., 1998).
  • Comparison of study findings with existing literature on deep dyslexia.
  • Theoretical argumentation to support the right-hemisphere hypothesis.

Main Results:

  • The study by Price et al. claimed to preclude a purely right-hemisphere explanation for deep dyslexia.
  • This re-analysis argues that the study's results actually support the right-hemisphere hypothesis.
  • The findings allow for a more detailed formulation of the right-hemisphere model.

Conclusions:

  • The right-hemisphere interpretation of deep dyslexic reading is reasserted as the preferred explanation.
  • The study by Price et al. is critiqued for not considering contradictory previous work.
  • A more detailed right-hemisphere model for deep dyslexia is proposed based on the re-analyzed data.

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