Document Detail


Chromatic input to cells of the magnocellular pathway: mean chromaticity and the relative phase of modulated lights.
MedLine Citation:
PMID:  15518205     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
If the relative phase of red and green modulated lights is changed, at low temporal frequencies the response of cells of the magnocellular (MC) pathway has been found to be minimal not to counterphase, chromatic modulation (as expected of a luminance mechanism) but shifted to some phase intermediate between luminance and chromatic modulation. The results could only be modeled by assuming interaction between achromatic and chromatic inputs to MC cells. The 'phase shift' resembled that seen with psychophysical threshold measurements using the same stimuli. Psychophysical results also showed that the phase shift is dependent on the chromaticity of a background. The results reported here show that the direction of the phase shift in MC cells is reversed by changing the background from long to short wavelengths and is consistent with psychophysical observations. Cell behavior was again modeled by assuming vector summation of achromatic and chromatic inputs. The reversal of phase-shift direction requires a reversal in polarity of the chromatic input. The underlying physiological mechanism may involve summation of chromatic signals of opposite polarity; if the relative size of these signals depends on the background, this may determine the direction of phase shift.
Authors:
Barry B Lee; Hao Sun
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Visual neuroscience     Volume:  21     ISSN:  0952-5238     ISO Abbreviation:  Vis. Neurosci.     Publication Date:    2004 May-Jun
Date Detail:
Created Date:  2004-11-02     Completed Date:  2005-01-11     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8809466     Medline TA:  Vis Neurosci     Country:  England    
Other Details:
Languages:  eng     Pagination:  309-14     Citation Subset:  IM    
Affiliation:
SUNY College of Optometry, New York, NY 10036, USA. blee@sunyopt.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Color Perception / physiology*
Discrimination (Psychology)
Lighting
Macaca fascicularis
Retinal Ganglion Cells / physiology
Grant Support
ID/Acronym/Agency:
EY 13112/EY/NEI NIH HHS

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


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