Document Detail

Impairment of the perception of second order motion but not first order motion in a patient with unilateral focal brain damage.
MedLine Citation:
PMID:  8858874     Owner:  NLM     Status:  MEDLINE    
Unlike first order motion, which is based on spatiotemporal variations in luminance, second-order motion relies on spatiotemporal variation of attributes derived from luminance, such as contrast. Here we show that a patient with a small unilateral cortical lesion adjacent to human cortical area MT (V5) has an apparently permanent disorder in perceiving several forms of second-order but not first-order motion in his contralateral visual field. This result indicates that separate pathways for motion perception exist, either as divergent pathways from area MT or even from primary visual cortex, or as separate pathways from subcortical areas to extrastriate visual areas.
L M Vaina; A Cowey
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  263     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1996-12-03     Completed Date:  1996-12-03     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1225-32     Citation Subset:  IM    
Boston University, Department of Biomedical Engineering, USA.
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MeSH Terms
Brain Injuries / physiopathology*
Motion Perception*
Visual Cortex / physiopathology*
Grant Support
EY-2R01-07861-06/EY/NEI NIH HHS

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