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Neuroimage. 2011 Feb 14;54(4):2994-3003. doi: 10.1016/j.neuroimage.2010.11.026. Epub 2010 Nov 21.

Speech-induced suppression of evoked auditory fields in children who stutter.

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  • 1Department of Speech-Language Pathology, University of Toronto, Toronto, Ontario, Canada. d.beal@utoronto.ca

Abstract

Auditory responses to speech sounds that are self-initiated are suppressed compared to responses to the same speech sounds during passive listening. This phenomenon is referred to as speech-induced suppression, a potentially important feedback-mediated speech-motor control process. In an earlier study, we found that both adults who do and do not stutter demonstrated a reduced amplitude of the auditory M50 and M100 responses to speech during active production relative to passive listening. It is unknown if auditory responses to self-initiated speech-motor acts are suppressed in children or if the phenomenon differs between children who do and do not stutter. As stuttering is a developmental speech disorder, examining speech-induced suppression in children may identify possible neural differences underlying stuttering close to its time of onset. We used magnetoencephalography to determine the presence of speech-induced suppression in children and to characterize the properties of speech-induced suppression in children who stutter. We examined the auditory M50 as this was the earliest robust response reproducible across our child participants and the most likely to reflect a motor-to-auditory relation. Both children who do and do not stutter demonstrated speech-induced suppression of the auditory M50. However, children who stutter had a delayed auditory M50 peak latency to vowel sounds compared to children who do not stutter indicating a possible deficiency in their ability to efficiently integrate auditory speech information for the purpose of establishing neural representations of speech sounds.

Copyright © 2010 Elsevier Inc. All rights reserved.

PMID:
21095231
[PubMed - indexed for MEDLINE]
PMCID:
PMC3042852
Free PMC Article

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