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Two different mechanisms for omission and substitution errors in neglect dyslexia.

Neglect dyslexia is a reading disorder often associated with right-sided brain lesions. In reading single words, errors are mostly substitutions or omissions of letters that occupy the left-sided positions. Typically, these errors have been thought to depend on a single mechanism. Conversely, we pro...

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Published in:Neurocase (Taylor & Francis Ltd) Vol. 17; no. 2; pp. 122 - 133
Main Authors: Martelli M, Arduino LS, Daini R
Format: research Journal Article
Published: Taylor & Francis Ltd Apr2011
Online Access:View this record in EBSCOhost
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      dt: Apr2011
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      pub: Taylor & Francis Ltd
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        atl: Two different mechanisms for omission and substitution errors in neglect dyslexia.
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        au:
          Martelli M
          Arduino LS
          Daini R
        affil: Dipartimento di Psicologia, Universita La Sapienza di Roma and IRCCS Santa Lucia, Roma, Italy.
      sug:
        subj:
          Attention
          Dyslexia Physiopathology
          Perceptual Disorders Physiopathology
          Aged
          Female
          Human
          Male
          Middle Age
          Neuropsychological Tests
          Aged: 65+ years
          Middle Aged: 45-64 years
          Female
          Male
      ab: Neglect dyslexia is a reading disorder often associated with right-sided brain lesions. In reading single words, errors are mostly substitutions or omissions of letters that occupy the left-sided positions. Typically, these errors have been thought to depend on a single mechanism. Conversely, we propose that they are due to different mechanisms. In particular, a visuo-spatial mechanism is responsible for omissions and a perceptual integration process for substitution errors. We measured the performance of six patients with both neglect and neglect dyslexia, analyzing their reading errors as a function of letter spacing. According to our conjecture, letter spacing should increase omissions by moving part of the string further in the unattended space, while it should reduce substitutions by restoring the integration processes. Furthermore, we predict that letter spacing should be more effective with pseudowords compared to words, in that in this latter case lexical effects are supposed to influence attentional and perceptual processes. Accordingly, we found that for pseudowords only the two types of errors are differently affected by this manipulation and only omissions correlate with the severity of the disorder in visuo-spatial tasks.
      pubtype: Academic Journal
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        research
        Journal Article
      ougenre: Article
    language: English
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