Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults

Hanna Renvall · Riitta Hari

59 citations0/0 files storedJournal of Cognitive Neuroscience

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Reading and Literacy Development Neurobiology of Language and Bilingualism Neuroscience and Music Perception

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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References

1983Categorizing sounds and learning to read—a causal connection 1980Auditory temporal perception, phonics, and reading disabilities in children 1985Developmental dyslexia: Four consecutive patients with cortical anomalies 1997To see but not to read; the magnocellular theory of dyslexia 1991Physiological and anatomical evidence for a magnocellular defect in developmental dyslexia.1995The evidence for a temporal processing deficit linked to dyslexia: A review 1973Defects of Non-Verbal Auditory Perception in Children with Developmental Aphasia 1996Abnormal processing of visual motion in dyslexia revealed by functional brain imaging

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2016Relationships between Categorical Perception of Phonemes, Phoneme Awareness, and Visual Attention Span in Developmental Dyslexia 2006Group Intervention Changes Brain Activity in Bilingual Language-Impaired Children 2020Atypical MEG inter-subject correlation during listening to continuous natural speech in dyslexia

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