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Auditory event-related potentials differ in dyslexics even when auditory psychophysical performance is normal
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Abstract:
Developmental dyslexia is characterized by a phonological processing deficit and impaired low-level auditory processing may contribute to this problem. However, this remains controversial because not all dyslexic individuals show psychophysical deficits on auditory processing tasks; hence it has been argued that auditory processing deficits are not a causal factor in dyslexia. Because behavioral psychophysical tasks include both bottom-up processing and top-down strategies, dyslexics' successful coping strategies may positively influence their performance on auditory behavioral measures. Therefore we have studied whether dyslexics who perform adequately on auditory psychophysical tasks nevertheless show electrophysiological evidence of impaired auditory processing. We compared auditory event-related mismatch negativity (MMN) potentials to frequency modulated (FM) tones at 5, 20 and 240 Hz between dyslexic adults and controls. Groups were matched for age, cognitive ability and psychophysical FM detection thresholds. The dyslexic group showed significantly smaller MMNs in the 20 Hz FM condition in both the early (150-300 ms, P = 0.010) and late (300-500 ms, P = 0.049) time frames. A 2-way ANOVA showed a significant group by FM rate interaction (P = 0.012). There were no significant differences between the groups in the 5 Hz or 240 Hz conditions. The magnitude of the 20 Hz FM MMN correlated with the degree of discrepancy between cognitive and literacy skills (0.66, P = 0.003) in the entire group. Thus, even among compensated dyslexics with above-average cognitive abilities and adequate performance on auditory psychophysical tasks, the MMN responses of some dyslexic adults were found to be abnormal. ; The full-text of this article is not available in ORA, but you may be able to access the article via the publisher copy link on this record page.
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Keyword:
auditory processing; dyslexia; event-related potential; Experimental psychology; frequency modulation
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URL: https://doi.org/10.1016/j.brainres.2006.08.095 http://www.elsevier.com/wps/find/journaldescription.cws_home/622287/description#description
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A case of exceptional reading accuracy in a child with Down syndrome: underlying skills and the relation to reading comprehension
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Developmental cognitive genetics: How psychology can inform genetics and vice versa
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A case of exceptional reading accuracy in a child with Down syndrome: Underlying skills and the relation to reading comprehension
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Hemispheric Specialization for Processing Auditory Nonspeech Stimuli
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Executive functions in children with communication impairments, in relation to autistic symptomatology. 2: response inhibition
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Executive functions in children with communication impairments, in relation to autistic symptomatology. 1: generativity
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Genetic influences on language impairment and phonological short-term memory
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Genetic influences in different aspects of language development: the etiology of language skills in 4.5-year-old twins
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