UNSPECIFIED (1998) EEG correlates of phonological processing in dyslexic children. In: Symposium on Psychophysiology of Maturation Disorders at the European-Congress-of-Psychophysiology-Societies, 1995, BARCELONA, SPAIN.

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Abstract

Previous studies using indirect measures of hemispheric specialization have indicated a link between lack of phonological awareness and reduced cerebral lateralisation. Using topographical mapping techniques this study aimed to investigate patterns of cortical activity in dyslexic children characterized by phonological processing difficulties. The test group comprised 31 dyslexic children recruited from a county-wide Reading Advisory Service and 29 control children recruited from local schools. Functional lateralisation in the children was assessed using both indirect (handedness) and direct (EEG) measures. Handedness was assessed using a peg-moving task, giving a relative hand skill measure of I - R/L + R. 28 channels of EEG data were collected using Brain Electrical Activity Mapping techniques; electrode pairs were compared using a similar measure. Results show that children with reading difficulties are significantly worse on a rest of phonological processing and that this population is significantly less lateralised than the control population, both in terms of handedness and cask-related cortical lateralisation. EEG anomalies in the dyslexic population were revealed in theta, alpha and beta wavebands, with increases in frontal theta, lock of alpha blocking, and little or no event-related desynchronisation in beta activity during the phonological processing task. The asymmetrical pattern of beta activity shown by the controls during the phonological processing task was not shown by the dyslexics. The differences were most marked over the parieto-occipital areas.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	B Philosophy. Psychology. Religion > BF Psychology R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Journal or Publication Title:	JOURNAL OF PSYCHOPHYSIOLOGY
Publisher:	HOGREFE & HUBER PUBLISHERS
ISSN:	0269-8803
Date:	1998
Volume:	12
Number:	3
Number of Pages:	14
Page Range:	pp. 261-274
Publication Status:	Published
Title of Event:	Symposium on Psychophysiology of Maturation Disorders at the European-Congress-of-Psychophysiology-Societies
Location of Event:	BARCELONA, SPAIN
Date(s) of Event:	1995
URI:	http://wrap.warwick.ac.uk/id/eprint/14957

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