Auditory cortical responses to speech-like stimuli in dyslexic adults

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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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Original languageEnglish
Pages (from-to)757-768
JournalJournal of Cognitive Neuroscience
Volume14
Issue number5
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

    Research areas

  • dyslexia, speech, auditory cortex

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