Electrophysiological Indices of Phonological Impairments in Dyslexia PurposeA range of studies have shown difficulties in perceiving acoustic and phonetic information in dyslexia; however, much less is known about how such difficulties relate to the perception of individual words. The authors present data from event-related potentials (ERPs) examining the hypothesis that children with dyslexia have difficulties with processing ... Article
Article  |   February 01, 2013
Electrophysiological Indices of Phonological Impairments in Dyslexia
 
Author Affiliations & Notes
  • Amy S. Desroches
    University of Winnipeg, Manitoba, Canada
  • Randy Lynn Newman
    Acadia University, Wolfville, Nova Scotia, Canada
  • Erin K. Robertson
    The University of Western Ontario, London, Ontario, Canada
  • Marc F. Joanisse
    The University of Western Ontario, London, Ontario, Canada
  • Correspondence to Amy S. Desroches: a.desroches@uwinnipeg.ca
  • Editor: Sid Bacon
    Editor: Sid Bacon×
  • Associate Editor: Julie Dockrell
    Associate Editor: Julie Dockrell×
Article Information
Speech, Voice & Prosodic Disorders / Language Disorders / Reading & Writing Disorders / Language
Article   |   February 01, 2013
Electrophysiological Indices of Phonological Impairments in Dyslexia
Journal of Speech, Language, and Hearing Research, February 2013, Vol. 56, 250-264. doi:10.1044/1092-4388(2012/10-0351)
History: Received December 15, 2010 , Revised September 6, 2011 , Accepted May 29, 2012
 
Journal of Speech, Language, and Hearing Research, February 2013, Vol. 56, 250-264. doi:10.1044/1092-4388(2012/10-0351)
History: Received December 15, 2010; Revised September 6, 2011; Accepted May 29, 2012
Web of Science® Times Cited: 4

PurposeA range of studies have shown difficulties in perceiving acoustic and phonetic information in dyslexia; however, much less is known about how such difficulties relate to the perception of individual words. The authors present data from event-related potentials (ERPs) examining the hypothesis that children with dyslexia have difficulties with processing phonemic information within spoken words compared to age-matched readers with typical development.

MethodThe authors monitored ERPs to auditory words during a simple picture-word matching task. The key manipulation was the inclusion of both matching stimuli and three types of mismatches (cohort, CONE-comb; rhyme, CONE-bone; and unrelated, CONE-fox).

ResultsChildren with dyslexia showed atypical N400 ERP waveforms to both types of phonological mismatches, but not to phonologically unrelated mismatches, reflecting a relative insensitivity to phonological overlap among auditory words.

ConclusionThe data suggest that children with dyslexia have impairments in integrating phonological information into word-level representations. The results suggest that speech perception difficulties in dyslexia might have consequences for processing auditory words.

Acknowledgments
This research was funded by grants from the Canadian Institute of Health Research (CIHR) to the fourth author, and from the Natural Sciences and Engineering Research Council (NSERC) and the Scottish Rite Charitable Foundation of Canada to the first and fourth authors. Infrastructure support was provided by the Canada Foundation for Innovation.
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