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About the role of visual field defects in pure alexia

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cris.virtualsource.author-orcidd4082c24-466f-4e64-8a77-58659ef2e6b9
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dc.contributor.authorPflugshaupt, Tobias
dc.contributor.authorGutbrod, Klemens
dc.contributor.authorWurtz, Pascal
dc.contributor.authorvon Wartburg, Roman
dc.contributor.authorNyffeler, Thomas
dc.contributor.authorde Haan, Bianca
dc.contributor.authorKarnath, Hans-Otto
dc.contributor.authorMueri, René M
dc.date.accessioned2024-10-14T07:55:43Z
dc.date.available2024-10-14T07:55:43Z
dc.date.issued2009
dc.description.abstractPure alexia is an acquired reading disorder characterized by a disproportionate prolongation of reading time as a function of word length. Although the vast majority of cases reported in the literature show a right-sided visual defect, little is known about the contribution of this low-level visual impairment to their reading difficulties. The present study was aimed at investigating this issue by comparing eye movement patterns during text reading in six patients with pure alexia with those of six patients with hemianopic dyslexia showing similar right-sided visual field defects. We found that the role of the field defect in the reading difficulties of pure alexics was highly deficit-specific. While the amplitude of rightward saccades during text reading seems largely determined by the restricted visual field, other visuo-motor impairments-particularly the pronounced increases in fixation frequency and viewing time as a function of word length-may have little to do with their visual field defect. In addition, subtracting the lesions of the hemianopic dyslexics from those found in pure alexics revealed the largest group differences in posterior parts of the left fusiform gyrus, occipito-temporal sulcus and inferior temporal gyrus. These regions included the coordinate assigned to the centre of the visual word form area in healthy adults, which provides further evidence for a relation between pure alexia and a damaged visual word form area. Finally, we propose a list of three criteria that may improve the differential diagnosis of pure alexia and allow appropriate therapy recommendations.
dc.description.numberOfPages11
dc.description.sponsorshipUniversitätsklinik für Neurologie
dc.identifier.doi10.7892/boris.32632
dc.identifier.isi000267440700027
dc.identifier.pmid19498088
dc.identifier.publisherDOI10.1093/brain/awp141
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/106063
dc.language.isoen
dc.publisherOxford University Press
dc.publisher.placeSan Diego, Calif.
dc.relation.ispartofBrain and cognition
dc.relation.issn0278-2626
dc.relation.organizationDCD5A442BAE0E17DE0405C82790C4DE2
dc.subject.ddc600 - Technology::610 - Medicine & health
dc.titleAbout the role of visual field defects in pure alexia
dc.typearticle
dspace.entity.typePublication
dspace.file.typetext
oaire.citation.endPage17
oaire.citation.issuePt 7
oaire.citation.startPage1907
oaire.citation.volume132
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oairecerif.author.affiliationUniversitätsklinik für Neurologie
oairecerif.author.affiliationUniversitätsklinik für Neurologie
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oairecerif.author.affiliationUniversitätsklinik für Neurologie
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unibe.date.licenseChanged2019-10-26 19:57:25
unibe.description.ispublishedpub
unibe.eprints.legacyId32632
unibe.journal.abbrevTitleBRAIN COGNITION
unibe.refereedTRUE
unibe.subtype.articlejournal

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