Document Detail

The effect of saccades on number processing.
MedLine Citation:
PMID:  17672432     Owner:  NLM     Status:  MEDLINE    
Recent research has shown that saccadic eye movements interfere with dorsal-stream tasks such as judgments of object orientation, but not with ventral-stream tasks such as object recognition. Because saccade programming and execution also rely on the dorsal stream, it has been hypothesized that cognitive saccadic suppression occurs as a result of dual-task interference within the dorsal stream. Judging whether one number is larger or smaller than another (magnitude comparison) is a dorsal-stream task that relies especially on the right parietal cortex. In contrast, judging whether a number is odd or even (parity judgment) does not involve the dorsal stream. In the present study, one group of subjects judged whether two-digit numbers were greater than or less than 65, whereas another group judged whether two-digit numbers were odd or even. Subjects in both groups made these judgments while making no, short, or long saccades. Saccade distance had no effect on parity judgments, but reaction times to make magnitude comparison judgments increased with saccade distance when the eyes moved from right to left. Because the right parietal cortex is instrumental in generating leftward saccades, these results provide further evidence for the hypothesis that cognitive suppression during saccades occurs as a result of dual-task interference within the dorsal stream.
David E Irwin; Laura E Thomas
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Perception & psychophysics     Volume:  69     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-08-03     Completed Date:  2007-08-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  450-8     Citation Subset:  IM    
Department of Psychology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61820, USA.
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MeSH Terms
Visual Perception*

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

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