Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults

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© 2002 MIT Press - Journals. This is the accepted version of the following article: Renvall, Hanna & Hari, Riitta. 2002. Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults. Journal of Cognitive Neuroscience. Volume 14, Issue 5. 757-768. ISSN 0898-929X (printed). DOI: 10.1162/08989290260138654, which has been published in final form at http://www.mitpressjournals.org/doi/abs/10.1162/08989290260138654#.VksKbkaBtIY.

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Journal Title

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Volume Title

School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2002

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Mcode

Degree programme

Language

en

Pages

757-768

Series

Journal of Cognitive Neuroscience, Volume 14, Issue 5

Abstract

Auditory cortical processing of speech-like sounds was studied in 9 dyslexic and 11 normal-reading adults. Noise/ square-wave sequences, mimicking transitions from a fricative consonant to a vowel, were presented binaurally once every 1.1 sec and the cortical responses were recorded with a whole-scalp neuromagnetometer. The auditory cortices of both hemispheres were less reactive to acoustical changes in dyslexics than in controls, as was evident from the weaker responses to the noise/square-wave transitions. The results demonstrate that dyslexic adults are deficient in processing acoustic changes presented in rapid succession within tens to hundreds of milliseconds. The observed differences could be related to insufficient triggering of automatic auditory attention, resulting, for instance, from a general deficiency of the magnocellular system.

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Keywords

dyslexia, speech, auditory cortex

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Citation

Renvall, Hanna & Hari, Riitta. 2002. Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults. Journal of Cognitive Neuroscience. Volume 14, Issue 5. 757-768. ISSN 0898-929X (printed). DOI: 10.1162/08989290260138654.