Impaired visual word processing in dyslexia revealed with magnetoencephalography

Impaired visual word processing in dyslexia revealed with magnetoencephalography Dyslexia is most often atributed to phonological impairments, manifested in abnormal activation of the left temporal and temporoparietal cortex in response to auditorily presented language and possibly associated with anomalies in the cytoarchitecture and hemispheric symmetry of the plana temporale. The immediate cortical correlate of the severely impaired reading process has, however, remained obscure. Here we report on the distinct time courses of cortical activation in dyslexic and control subjects during passive viewing of single words, tracked with whole‐head magnetoencephalography. A striking difference was found in the left inferior temporo‐occipital region where intracranial recordings have recently identified word‐specific responses within 200 msec after stimulus onset: controls showed a sharp activation at about 180 msec after word presentation, whereas dyslexics failed to activate this area entirely, or showed a slowly increasing late response. Pereception of words as specific units thus seems to be imparied in dyslexics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Neurology Wiley

Impaired visual word processing in dyslexia revealed with magnetoencephalography

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Publisher
Wiley
Copyright
Copyright © 1996 American Neurological Association
ISSN
0364-5134
eISSN
1531-8249
DOI
10.1002/ana.410400206
Publisher site
See Article on Publisher Site

Abstract

Dyslexia is most often atributed to phonological impairments, manifested in abnormal activation of the left temporal and temporoparietal cortex in response to auditorily presented language and possibly associated with anomalies in the cytoarchitecture and hemispheric symmetry of the plana temporale. The immediate cortical correlate of the severely impaired reading process has, however, remained obscure. Here we report on the distinct time courses of cortical activation in dyslexic and control subjects during passive viewing of single words, tracked with whole‐head magnetoencephalography. A striking difference was found in the left inferior temporo‐occipital region where intracranial recordings have recently identified word‐specific responses within 200 msec after stimulus onset: controls showed a sharp activation at about 180 msec after word presentation, whereas dyslexics failed to activate this area entirely, or showed a slowly increasing late response. Pereception of words as specific units thus seems to be imparied in dyslexics.

Journal

Annals of NeurologyWiley

Published: Aug 1, 1996

References

  • Developmental dyslexia: four consecutive patients with cortical anomalies
    Galaburda, Galaburda; Sherman, Sherman; Rosen, Rosen
  • Deficit of temporal auditory processing in dyslexic adults
    Hari, Hari; Kiesilä, Kiesilä
  • Face recognition in human extrastriate cortex
    Allison, Allison; Ginter, Ginter; McCarthy, McCarthy

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