| Saliency modulates global perception in simultanagnosia. | |
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MedLine Citation:
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PMID: 20593278 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Patients with parieto-occipital brain damage may show simultanagnosia, a selective impairment in the simultaneous perception and integration of multiple objects (global perception) with normal recognition of individual objects. Recent findings in patients with simultanagnosia indicate improved global perception at smaller spatial distances between local elements of hierarchical organized complex visual arrays. Global perception thus does not appear to be an all-or-nothing phenomenon but can be modified by the spatial relationship between local elements. The present study aimed to define characteristics of a general principle that accounts for improved global perception of hierarchically organized complex visual arrays in patients with simultanagnosia with respect to the spatial properties of local elements. In detail, we investigated the role of the number and size of the local elements as well as their relationship with each other for the global perception. The findings indicate that global perception increases independently of the size of the global object and depends on the spatial relationship between the local elements and the global object. The results further argue against the possibility of a restriction in the attended or perceived area in simultanagnosia, in the sense that the integration of local elements into a global scene is impaired if a certain spatial "field of view" is exceeded. A possible explanation for these observations might be a shift from global to local saliency in simultanagnosia. |
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Authors:
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Elisabeth Huberle; Hans-Otto Karnath |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-01 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 204 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-14 Completed Date: 2010-12-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 595-603 Citation Subset: IM |
Affiliation:
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Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany. elisabeth.huberle@usz.ch |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Agnosia / pathology, physiopathology*, psychology Attention / physiology Brain Damage, Chronic / pathology, physiopathology, psychology Brain Mapping Case-Control Studies Female Humans Magnetic Resonance Imaging Male Middle Aged Parietal Lobe / pathology, physiopathology Pattern Recognition, Visual / physiology* Photic Stimulation Reading Space Perception / physiology* Visual Cortex / pathology, physiopathology Visual Pathways / pathology, physiopathology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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