The locus of deficits in dysphonemic dyslexia: an ERP analysis

Author(s): Garcia, M. I. B.

Journal/Book: Psicothema. 2000; 12: Ildefonso S. Del Rio, 4-1 B, 33001 Oviedo, Spain. Colegio Oficial De Psicologos De Asturias. 79-85.

Abstract: Brain stem, middle auditory and auditory event-related potentials (ERPs) were recorded from a group of 13 dysphonemic dyslexic children and 10 matched normal controls. Auditory stimuli were used to elicit ERPs. The focus of our study was an ERP investigation of a slower auditory categorization, rather than simple detection, of pure tones. Brain stem and middle auditory evoked responses did not show any retardation in dyslexics compared with non-dyslexic children. When subjects performed a tone categorization task in which they were required to detect a rare tone interspersed in a series of frequent tones, dysphonemic dyslexics showed longer N2 latency. Compared with non-dyslexics, N2 delays were maximal over the left temporo-parietal region and bilaterally over the occipital sites. These areas have been postulated to be crucial in oral language and reading comprehension.

Note: Article Abad EV, Univ Nacl Educ Distancia, Fac Psicol, E-28040 Madrid, SPAIN

Keyword(s): EVENT-RELATED POTENTIALS; AUDITORY EVOKED-POTENTIALS; DEVELOPMENTAL DYSLEXIA; READING-DISABILITY; PHONOLOGICAL AWARENESS; CHILDREN; PERCEPTION; ABILITY; DEFICIENCIES; RESPONSES

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