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Processing of derived forms in high-functioning dyslexics.

S Hélène Deacon1, Rauno Parrila, John R Kirby

  • 1Department of Psychology, LSC, Dalhousie University, 1355 Oxford Street, B3H 4J1, Halifax, Nova Scotia, Canada, sdeacon@dal.ca

Annals of Dyslexia
|September 13, 2007
PubMed
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High-functioning dyslexics struggle with processing derived word forms, unlike typical readers. This difficulty in understanding word morphology may persist despite adequate reading comprehension skills.

Area of Science:

  • Cognitive Psychology
  • Developmental Psychology
  • Linguistics

Background:

  • Dyslexia is a reading disorder affecting individuals' ability to process written language.
  • High-functioning dyslexics demonstrate age-appropriate reading comprehension despite a history of reading difficulties.
  • Morphological complexity, particularly derived forms, presents a challenge in language processing.

Purpose of the Study:

  • To investigate the processing of derived word forms in high-functioning dyslexics.
  • To compare the performance of high-functioning dyslexics with normal adult readers on a lexical decision task.
  • To identify specific difficulties in morphological processing associated with dyslexia.

Main Methods:

  • A lexical decision task was administered to high-functioning dyslexics and normal adult readers.

Related Experiment Videos

  • Stimuli included derived words (e.g., cloudy), pseudo-derived words (e.g., belly), and items with/without orthographic changes.
  • Response times were recorded and analyzed based on morphological complexity and orthographic changes.

    • Main Results:

    • Control participants showed systematic variations in response times based on morphological complexity.
    • High-functioning dyslexics' response times did not vary systematically with morphological complexity.
    • Evidence suggests a link between derivational processing difficulties and overall reading ability in dyslexics.

    Conclusions:

    • High-functioning dyslexics exhibit persistent challenges in processing derived word forms.
    • Difficulties in understanding word morphology may be a specific, enduring characteristic of dyslexia.
    • These findings highlight the importance of morphological processing in reading and language acquisition.