Document Detail

Stimulus cueing in blindsight.
MedLine Citation:
PMID:  14650854     Owner:  NLM     Status:  MEDLINE    
When visual stimuli are presented in the cortically blind visual field of patients or monkeys with verified destruction of striate cortex, many subjects can voluntarily respond to them. In studies of this blindsight, the on- and/or offset of the visual stimulus is usually known to the subject, either because it is signaled in some way or because the subject can present the stimulus himself. To study the effect of stimulus uncertainty on the responses of four hemianopic monkeys and one human hemianope, we compared trials on which the subjects themselves could instantly trigger the stimulus with trials on which the same stimulus appeared 1-7 s after the start-light that normally served as the trigger was first touched. The latter manipulation diminished both the percentage of trials on which the subjects responded and the percentage correct when they did respond. As the start-light disappeared when touched in the first but not second condition, we interpret our results as indicating an influential role for attention in blindsight. Although keeping attention focused on the start-light and delaying the target impaired performance especially in the monkeys, localization was still significant in three and hardly affected in GY.
Alan Cowey; Petra Stoerig
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Progress in brain research     Volume:  144     ISSN:  0079-6123     ISO Abbreviation:  Prog. Brain Res.     Publication Date:  2004  
Date Detail:
Created Date:  2003-12-03     Completed Date:  2003-12-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0376441     Medline TA:  Prog Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  261-77     Citation Subset:  IM    
Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, UK.
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MeSH Terms
Hemianopsia / physiopathology*,  psychology*
Macaca mulatta
Middle Aged
Photic Stimulation*
Vision, Ocular*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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