Document Detail

Saccadic suppression and stimulus uncertainty.
MedLine Citation:
PMID:  2019888     Owner:  NLM     Status:  MEDLINE    
Saccadic suppression is a decline in detectability of a weak flash presented during a saccadic eye movement. We examined the hypothesis of Matin [Psychol. Bull. 81, 899 (1974)] that saccadic suppression may be due to increased stimulus uncertainty during the saccade. Uncertainty could arise from variability and inhomogeneities in the visual frame of reference translation that must accompany a saccade. We measured an average 0.6-log-unit suppression for a brief foveal 1 degree flash in a light-adapted detection task. Receiver-operating-characteristic (ROC) slopes for flash detection during saccades, compared with those when fixating, were reduced, indicating the presence of increased uncertainty. The magnitude of this uncertainty change was estimated and found to be consistent with that required to account for the measured detectability decline. When a flashed pedestal was employed to reduce the effect of uncertainty, there was no saccadic suppression and no ROC slope change. Also, spatially separate flashed markers, intended to reduce uncertainty, led to a significant reduction in saccadic suppression for one of two subjects. Our results are consistent with the hypothesis that a saccade leaves the observer with increased uncertainty as to which subjective visual direction to attend for a stimulus of fixed retinal locus. The magnitude of this uncertainty change can account fully for the saccadic suppression measured.
D S Greenhouse; T E Cohn
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  8     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1991 Mar 
Date Detail:
Created Date:  1991-05-30     Completed Date:  1991-05-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  587-95     Citation Subset:  IM    
School of Optometry, University of California, Berkeley 94720.
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MeSH Terms
Eye Movements
Fixation, Ocular / physiology
Photic Stimulation
Saccades / physiology*
Visual Perception / physiology
Grant Support

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

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