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Related Experiment Videos

New evidence for morphological errors in deep dyslexia.

Kathleen Rastle1, Lorraine K Tyler, William Marslen-Wilson

  • 1Department of Psychology, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK. Kathy.Rastle@rhul.ac.uk

Brain and Language
|November 18, 2005
PubMed
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Deep dyslexia reading errors are genuinely morphological, not visual. This finding supports the idea that the reading system has a morphologically structured component.

Area of Science:

  • Psycholinguistics
  • Neurolinguistics
  • Cognitive Science

Background:

  • Deep dyslexia is characterized by reading errors, often morphological (e.g., 'sexist' to 'sexy').
  • These errors have been interpreted as evidence for morphologically structured representations in reading.
  • An alternative view suggests these are visual errors, not morphological.

Observation:

  • A deep dyslexic patient (DE) read aloud lists of genuinely suffixed, pseudosuffixed, and non-morphologically embedded words.
  • Stem errors (errors including the word stem) were analyzed based on the word's morphological status.
  • Genuine morphological status significantly influenced stem error production.

Findings:

  • Genuinely suffixed words produced more stem errors than pseudosuffixed or non-morphologically embedded words.

Related Experiment Videos

  • This effect was independent of word imageability and frequency.
  • The results indicate that morphological errors in deep dyslexia are indeed morphological.

    • Implications:

    • This challenges the purely visual error account of morphological errors in deep dyslexia.
    • The findings support theories positing morphologically structured representations in the reading system.
    • Understanding these errors offers insights into the cognitive mechanisms underlying reading and dyslexia.