Document Detail

Spatial summation of S-cone ON and OFF signals: effects of retinal eccentricity.
MedLine Citation:
PMID:  14568375     Owner:  NLM     Status:  MEDLINE    
We studied spatial summation for S-cone ON and OFF signals as a function of retinal eccentricity in human subjects. S-cone isolation was obtained by the two-colour threshold method of Stiles, modified by adding blue light to the yellow background. Test stimuli were blue light increments or decrements within a circular area of variable size. These were presented for 100 ms at 0 to 20 deg along the horizontal temporal retinal meridian. Ricco's area of complete spatial summation was measured from the threshold vs. area curves. This was nearly constant and approximately the same for both types of stimuli within the 0-5 deg range and increased beyond this range. The decremental area increased faster, suggesting that separate mechanisms, presumably ON and OFF, integrate S-cone increments and decrements. The results appear to provide new evidence for the existence of separate S-cone ON and OFF pathways. We compare the data with known morphology of primate retina and assume that, if S-cone decrements are detected via separate OFF cells, these should differ in density and dendritic field size from the S-cone ON cells, but only in the retinal periphery.
Angel Vassilev; Milena S Mihaylova; Kalina Racheva; Margarita Zlatkova; Roger S Anderson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  43     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-10-21     Completed Date:  2003-12-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2875-84     Citation Subset:  IM    
Institute of Physiology, Bulgarian Academy of Sciences, Acad G Bonchev St Bl 23, Sofia 1113, Bulgaria.
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MeSH Terms
Color Perception / physiology*
Dark Adaptation
Depth Perception / physiology*
Differential Threshold / physiology
Middle Aged
Retina / physiology*
Retinal Cone Photoreceptor Cells / physiology
Space Perception / physiology
Vision Disparity / physiology
Visual Fields / physiology

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

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