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Electrophysiological correlates of impaired reading in dyslexic pre-adolescent children

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dc.contributor.authorAraújo, Susana
dc.contributor.authorBramão, Inês
dc.contributor.authorFaísca, Luís
dc.contributor.authorPetersson, Karl Magnus
dc.contributor.authorReis, Alexandra
dc.date.accessioned2014-07-31T14:49:07Z
dc.date.available2014-07-31T14:49:07Z
dc.date.issued2012
dc.date.updated2014-07-30T10:21:56Z
dc.description.abstractIn this study, event related potentials (ERPs) were used to investigate the extent to which dyslexics (aged 9–13 years) differ from normally reading controls in early ERPs, which reflect prelexical orthographic processing, and in late ERPs, which reflect implicit phonological processing. The participants performed an implicit reading task, which was manipulated in terms of letter-specific processing, orthographic familiarity, and phonological structure. Comparing consonant- and symbol sequences, the results showed significant differences in the P1 and N1 waveforms in the control but not in the dyslexic group. The reduced P1 and N1 effects in pre-adolescent children with dyslexia suggest a lack of visual specialization for letter-processing. The P1 and N1 components were not sensitive to the familiar vs. less familiar orthographic sequence contrast. The amplitude of the later N320 component was larger for phonologically legal (pseudowords) compared to illegal (consonant sequences) items in both controls and dyslexics. However, the topographic differences showed that the controls were more left-lateralized than the dyslexics. We suggest that the development of the mechanisms that support literacy skills in dyslexics is both delayed and follows a non-normal developmental path. This contributes to the hemispheric differences observed and might reflect a compensatory mechanism in dyslexics.por
dc.identifier.citationAraújo, Susana; Bramão, Inês; Faísca, Luís; Petersson, Karl Magnus; Reis, Alexandra. Electrophysiological correlates of impaired reading in dyslexic pre-adolescent children, Brain and Cognition, 79, 2, 79-88, 2012.por
dc.identifier.doihttp://dx.doi.org/10.1016/j.bandc.2012.02.010
dc.identifier.issn0278-2626
dc.identifier.otherAUT: LFA00717; AIR01687; MIB02287; KMP02316;
dc.identifier.urihttp://hdl.handle.net/10400.1/4900
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0278262612000334por
dc.subjectDyslexiapor
dc.subjectERPpor
dc.subjectOrthographic processingpor
dc.subjectPhonological processingpor
dc.titleElectrophysiological correlates of impaired reading in dyslexic pre-adolescent childrenpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage88por
oaire.citation.issue2
oaire.citation.startPage79por
oaire.citation.titleBrain and Cognitionpor
oaire.citation.volume79por
person.familyNameAraújo
person.familyNameBramão
person.familyNameFaísca
person.familyNamePetersson
person.familyNameReis
person.givenNameSusana
person.givenNameInês
person.givenNameLuís
person.givenNameKarl Magnus
person.givenNameAlexandra
person.identifier548901
person.identifierA-4633-2013
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person.identifier.orcid0000-0003-4859-8817
person.identifier.orcid0000-0002-8245-0392
person.identifier.orcid0000-0001-5598-0999
person.identifier.ridA-7424-2013
person.identifier.ridE-8188-2012
person.identifier.scopus-author-id36678827900
person.identifier.scopus-author-id16068281000
person.identifier.scopus-author-id6503944802
person.identifier.scopus-author-id7006470225
person.identifier.scopus-author-id7202574376
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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