Visuomotor performance in a patient with visual agnosia due to an early lesion.

Details

Serval ID
serval:BIB_B6BF6EAE69FF
Type
Article: article from journal or magazin.
Collection
Publications
Title
Visuomotor performance in a patient with visual agnosia due to an early lesion.
Journal
Brain Research. Cognitive Brain Research
Author(s)
Dijkerman H.C.,  S., Démonet J.F., Milner A.D.
ISSN
0926-6410 (Print)
ISSN-L
0926-6410
Publication state
Published
Issued date
2004
Peer-reviewed
Oui
Volume
20
Number
1
Pages
12-25
Language
english
Notes
Publication types: Case Reports ; Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish. PDF type: Research report
Abstract
We tested a patient with visual agnosia who had suffered severe bilateral brain damage early in life, on a series of visuomotor tasks. The broad pattern of results confirms that S.B., like the extensively tested patient D.F., shows an impressive array of preserved skills, despite his severe perceptual problems. Also like D.F., S.B. shows certain subtle visuomotor difficulties that can be related to the idea that his partially intact occipito-parietal areas are unable to benefit from interactions with the apparently severely damaged occipito-temporal regions. Unlike D.F., however, he is able to make accurate discriminations of simple visual features, such as object width and orientation, albeit with very slow response times. We hypothesize that several factors such as the early onset of S.B.'s lesion and the long period since his brain lesion have allowed his brain to compensate to a degree what has been impossible in D.F., whose brain damage occurred in adulthood. This may include an element of 'rewiring' and self-monitoring of visuomotor processes that allow S.B. to achieve perceptual access to visual information processed in the dorsal stream: information that is normally only available for on-line visuomotor control.
Keywords
Adult, Agnosia/etiology, Agnosia/psychology, Discrimination (Psychology), Fingers/physiology, Form Perception/physiology, Hand Strength/physiology, Humans, Illusions/psychology, Imagination/physiology, Magnetic Resonance Imaging, Male, Orientation, Psychomotor Performance/physiology, Size Perception/physiology, Touch/physiology, Visual Perception/physiology
Pubmed
Create date
24/03/2013 19:40
Last modification date
20/08/2019 16:25
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