Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study

Neuroreport
Barbara PenolazziAlessandro Angrilli

Abstract

The present event-related potential study aimed at finding neurophysiological correlates of inadequate reading performances in developmental dyslexia. By using the same set of words in different linguistic tasks, we found variations of cortical asymmetry between dyslexic individuals and controls starting with the N420, a component supposed to index the phonological processing during reading. Whereas in controls this component was left lateralized, in disabled readers it was more distributed across hemispheres. The observed lack of lateralization in dyslexic individuals was also found in the later slow negative wave that developed in the 700 to 1500-ms time interval. We postulate that the altered asymmetry is related to an impairment of the grapheme-phoneme conversion mechanism. The findings would therefore support the hypothesis of a phonological deficit underlying this learning disability.

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Citations

Jul 9, 2010·Developmental Neuropsychology·Chiara SpironelliAlessandro Angrilli
Apr 5, 2011·Developmental Neuropsychology·Donna CochNatalie Berger
Aug 7, 2010·Brain : a Journal of Neurology·Chiara SpironelliAlessandro Angrilli
Apr 1, 2011·Brain and Language·Karen LidzbaMarko Wilke
Jan 30, 2010·Behavioural Brain Research·Barbara PenolazziAlessandro Angrilli
Feb 9, 2010·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Odelia ElkanaAvraham Schweiger
Jun 2, 2010·Learning and Individual Differences·Christopher J LemonsBobette Bouton
Oct 1, 2008·Psychophysiology·Donna CochNatalie Berger
Sep 23, 2008·Psychophysiology·Barbara PenolazziAlessandro Angrilli
Oct 19, 2006·Behavioural Brain Research·Chiara Spironelli, Alessandro Angrilli
Jun 15, 2012·Developmental Cognitive Neuroscience·Jennifer M McDermottNathan A Fox
Jul 3, 2013·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Chiara SpironelliAlessandro Angrilli
Sep 19, 2007·Arquivos de neuro-psiquiatria·Letícia EcardPedro Ribeiro

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