| Disorders of higher visual processing. | |
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MedLine Citation:
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PMID: 21601069 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A significant proportion of human cortex is involved in visual processing. Cerebral regions beyond striate cortex show specialization for specific stimulus properties: damage to these regions leads to syndromes that also reflect this specialization. These syndromes can be grouped into two broad categories. In the ventral group, there is damage to medial occipitotemporal structures that participate in object identification and recognition. This can result in a variety of syndromes, including achromatopsia, general visual object agnosia, or more selective object recognition deficits such as prosopagnosia, alexia, and certain forms of topographagnosia, such as landmark agnosia. In the second, dorsal group, there is damage to lateral occipitoparietal structures that participate in visuospatial processing and localization. Patients with such damage may have akinetopsia (impaired motion processing), various components of Bálint syndrome, or astereopsis. Finally, it is also possible to find patients in whom residual visual processing is evident despite damage to the geniculostriate pathway; this blindsight may reflect residual function of either subcortical structures, such as the superior colliculus, or alternate afferent routes to surviving extrastriate cortex. |
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Authors:
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Jason J S Barton |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Handbook of clinical neurology / edited by P.J. Vinken and G.W. Bruyn Volume: 102 ISSN: 0072-9752 ISO Abbreviation: Handb Clin Neurol Publication Date: 2011 |
Date Detail:
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Created Date: 2011-05-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0166161 Medline TA: Handb Clin Neurol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 223-61 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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