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Technique to investigate the temporal phase shift between L- and M-cone inputs to the luminance mechanism
MedLine Citation:
PMID:  10795632     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We describe a technique to estimate the intrinsic phase shift between long-wavelength-cone (L-cone) and middle-wavelength-cone (M-cone) signals in the luminance mechanism with minimal contamination by chromatic mechanism(s). The technique can also estimate, simultaneously with the phase shift, the weight ratio of L and M cones for the luminance mechanism. We measured motion identification thresholds for a 1.0 cycle/deg, 12.0-Hz sinusoidal grating representing different vector directions in L- and M-cone contrast space. The physical phase of the L- and M-cone signals was varied over a broad range between -150 deg and +150 deg to investigate the effect on the threshold contours. The slope of the threshold contour in cone contrast space varied as a function of the physical phase. Estimates of the intrinsic phase shift between L and M cones are based on the change in slope of the threshold contour. The estimates are consistent with previous reports and show that whereas the L-cone signal lags behind the M-cone signal by approximately 35 deg for an orange background, the M-cone signal lags behind the L-cone signal by approximately 8 deg for a green background.
Authors:
Tsujimura; Shioiri; Hirai; Yaguchi
Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics, image science, and vision     Volume:  17     ISSN:  1520-8532     ISO Abbreviation:  J Opt Soc Am A Opt Image Sci Vis     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-05-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9800943     Medline TA:  J Opt Soc Am A Opt Image Sci Vis     Country:  UNITED STATES    
Other Details:
Languages:  Eng     Pagination:  846-57     Citation Subset:  -    
Affiliation:
Institute of Information Sciences and Electronics, University of Tsukuba, Ibakari, Japan. s.tsujimura@aston.ac.uk
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