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.
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2002
Major/Subject
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.
Description
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.