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An attempt to simulate letter-by-letter dyslexia in normal readers.

We attempted to simulate the main features of letter-by-letter (LBL) dyslexia in normal readers through stimulus degradation (i.e. contrast reduction and removal of high spatial frequencies). The results showed the word length and the letter confusability effects characteristic of LBL dyslexia. Howe...

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Published in:Brain & Language Vol. 98; no. 3; pp. 251 - 264
Main Authors: Fiset S, Arguin M, Fiset D
Format: research tables/charts Journal Article
Published: Academic Press Inc. Sep2006
Online Access:View this record in EBSCOhost
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      dt: Sep2006
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      pub: Academic Press Inc.
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        atl: An attempt to simulate letter-by-letter dyslexia in normal readers.
      aug:
        au:
          Fiset S
          Arguin M
          Fiset D
        affil: Groupe de Recherche en Neuropsychologie et Cognition, Département de psychologie, Université de Montréal, C.P. 6128, succ. Centre-ville, Montréal QC, Canada H3C 3J7; Centre de recherche, Institut Universitaire de Gériatrie de Montréal, Canada.
      sug:
        subj:
          Dyslexia Diagnosis
          Perceptual Masking
          Vocabulary
          Adult
          Analysis of Variance
          Data Collection, Computer Assisted
          Descriptive Statistics
          Female
          Funding Source
          Male
          Memory
          Physical Stimulation
          Reaction Time
          Severity of Illness Indices
          Simulations
          Visual Perception Physiology
          Human
          Adult: 19-44 years
          Female
          Male
      ab: We attempted to simulate the main features of letter-by-letter (LBL) dyslexia in normal readers through stimulus degradation (i.e. contrast reduction and removal of high spatial frequencies). The results showed the word length and the letter confusability effects characteristic of LBL dyslexia. However, the interaction of letter confusability and N size (i.e. a facilitatory effect only for low confusability targets) previously observed in LBL dyslexics [Arguin, M., Fiset, S., & Bub, D. (2002). Sequential and parallel letter processing in letter-by-letter reading. Cognitive Neuropsychology, 19, 535-555; Arguin, M., & Bub, D. (2006). Parallel processing blocked by letter similarity in letter dyslexia: a replication. Cognitive Neuropsychology, 22, 589-602; Fiset, D., Arguin, M. & McCabe, E. (2005a). The breakdown of parallel letter processing in letter-by-letter dyslexia. Cognitive Neuropsychology, 22, 1-22] was not found. Our results suggest that the type of visual degradation employed here may only partially correspond to the visual deficit present in LBL dyslexia and that this degradation may have prevented the normal readers from accessing visual information available to LBL dyslexics when they use the compensatory strategy of serial letter processing. Copyright © 2006 by Elsevier Inc.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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