title: Behavioral performances in participants with phonological dyslexia and different patterns on the N170 component.
abstract: Adults with phonological dyslexia and controls performed a lexical decision task while ERPs were recorded in the occipitotemporal pathway. Based on N170 durations, two subgroups were formed: dysl1 showing longer N170 durations and dysl2 showing normal N170 durations. While the dysl1 subgroup had poorer accuracy for infrequent words and pseudo-words, the dysl2 group responded more slowly than controls to pseudo-words. N170 amplitudes were larger in the left hemisphere for controls irrespective of items. In the dysl1 subgroup, N170 amplitudes were larger in the left hemisphere than the right for words but not for pseudo-words, a sign of hemispheric compensation, while in the dysl2 subgroup signs of bilateralization were observed. Moreover, in the dysl1 subgroup, P100 amplitudes were smaller than controls. These results indicate different behavioral profiles of dyslexics with different patterns of P100 and N170 components. The ERP changes may be due to different behavioral strategies employed by each subgroup, logographic in dysl2 and phonological in dysl1.
authors.affiliation: Université de Rouen, Université des Sciences Humaines et Sociales, Laboratoire Psychologie et Neurosciences de la Cognition et de l'Affectivité (PSY.NCA EA-4306), 76821 Mont-Saint-Aignan Cedex, France.
authors.forename: Tiffanie
authors.initials: T
authors.lastname: Dujardin
authors.forename: Yann
authors.initials: Y
authors.lastname: Etienne
authors.forename: Claire
authors.initials: C
authors.lastname: Contentin
authors.forename: Christian
authors.initials: C
authors.lastname: Bernard
authors.forename: Pierre
authors.initials: P
authors.lastname: Largy
authors.forename: Daniel
authors.initials: D
authors.lastname: Mellier
authors.forename: Robert
authors.initials: R
authors.lastname: Lalonde
authors.forename: Mohamed
authors.initials: M
authors.lastname: Rebaï
mesh_terms: D000328:Adult; D001931:Brain Mapping; D003657:Decision Making / Q000502:physiology*; D004410:Dyslexia / Q000503:physiopathology*; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D011932:Reading; D012044:Regression Analysis; D018709:Statistics, Nonparametric