Article: article from journal or magazin.
Remediation effects on N170 and P300 in children with developmental dyslexia.
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
This study aimed at investigating the ERP correlates (N170 and P300 components) of a multimodal training program focused in dyslexia. ERPs were obtained from 32 electrodes in 24 French children with developmental dyslexia (mean age 10 years 7 months) during a visual lexical decision task. All the children received two intensive two-month evidence-based training programs: one based on phonemic awareness and the other on visual and orthographic processing in a cross-over design. Ten control children matched on chronological age were also tested. We showed dissociation between N170, P300 and behavioral improvement. In the dyslexic group, P300 amplitude decreased for non-words and words as the latter yielded performance improvement. In the control group, the same effect was observed for pseudo-words. At the same time, the opposite pattern occurred for the N170 latency, which was shortened for pseudo-words and pseudo-homophones in the dyslexic group and for words in the typically achieving children. We argue that training might modulate cortical activity in dyslexic children in a visual word recognition task. Considering the well-known implication of P300 in attentional processes, our results reflect the strong link between reading skill improvement after remediation and visual attentional process maturation.
Attention/physiology, Brain/physiopathology, Case-Control Studies, Child, Cross-Over Studies, Dyslexia/physiopathology, Dyslexia/therapy, Electroencephalography, Event-Related Potentials, P300, Evoked Potentials, Female, France, Humans, Language Tests, Language Therapy, Male, Pattern Recognition, Visual/physiology, Phonetics, Reading, Recognition (Psychology)/physiology, Time Factors, Treatment Outcome
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