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dc.contributor.authorBalslev, Daniela
dc.contributor.authorOdoj, Bartholomaeus
dc.contributor.authorRennig, Johannes
dc.contributor.authorKarnath, Hans-Otto
dc.date.accessioned2014-09-04T09:31:02Z
dc.date.available2014-09-04T09:31:02Z
dc.date.issued2014-12
dc.identifier.citationBalslev , D , Odoj , B , Rennig , J & Karnath , H-O 2014 , ' Abnormal center-periphery gradient in spatial attention in simultanagnosia ' , Journal of Cognitive Neuroscience , vol. 26 , no. 12 , pp. 2778-2788 . https://doi.org/10.1162/jocn_a_00666en
dc.identifier.issn0898-929X
dc.identifier.otherPURE: 129127010
dc.identifier.otherPURE UUID: 78d18825-8a1d-4f40-aaa5-09b09dc75362
dc.identifier.otherPubMed: 24893736
dc.identifier.otherScopus: 84931098091
dc.identifier.otherORCID: /0000-0001-7843-1044/work/46120496
dc.identifier.otherWOS: 000344573500010
dc.identifier.urihttps://hdl.handle.net/10023/5338
dc.descriptionThis work was supported by the Danish Medical Research Councils [grant number 09-072209 to DB] .en
dc.description.abstractPatients suffering from simultanagnosia cannot perceive more than one object at a time. The underlying mechanism is incompletely understood. One hypothesis is that simultanagnosia reflects "tunnel vision," a constricted attention window around gaze, which precludes the grouping of individual objects. Although this idea has a long history in neuropsychology, the question whether the patients indeed have an abnormal attention gradient around the gaze has so far not been addressed. Here we tested this hypothesis in two simultanagnosia patients with bilateral parieto-occipital lesions and two control groups, with or without brain damage. We assessed the participants' ability to discriminate letters presented briefly at fixation with and without a peripheral distractor or in the visual periphery, with or without a foveal distractor. A constricted span of attention around gaze would predict an increased susceptibility to foveated versus peripheral distractors. Contrary to this prediction and unlike both control groups, the patients' ability to discriminate the target decreased more in the presence of peripheral compared with foveated distractors. Thus, the attentional spotlight in simultanagnosia does not fall on foveated objects as previously assumed, but rather abnormally highlights the periphery. Furthermore, we found the same center-periphery gradient in the patients' ability to recognize multiple objects. They detected multiple, but not single objects more accurately in the periphery than at fixation. These results suggest that an abnormal allocation of attention around the gaze can disrupt the grouping of individual objects into an integrated visual scene.
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofJournal of Cognitive Neuroscienceen
dc.rightsCopyright © 2014. Massachusetts Institute of Technology. This is an Accepted Manuscript of an article published online in the Journal of Cognitive Neuroscience on 4 June 2014, available online: https://doi.org/10.1162/jocn_a_00666en
dc.subjectRC0321 Neuroscience. Biological psychiatry. Neuropsychiatryen
dc.subjectBDCen
dc.subject.lccRC0321en
dc.titleAbnormal center-periphery gradient in spatial attention in simultanagnosiaen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.identifier.doihttps://doi.org/10.1162/jocn_a_00666
dc.description.statusPeer revieweden


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