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    
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.
Barry B Lee; Hao Sun
Related Documents :
15676345 - Systematic selection of shift plans for continuous production with the aid of work-phys...
6626095 - Circadian organization of locomotor activity in the turkish hamster (mesocricetus brand...
16041605 - A phase response curve for circannual rhythm in the varied carpet beetle anthrenus verb...
1571595 - Relationship between phase resetting and the free-running period in djungarian hamsters.
22870385 - Precise and continuous time and frequency synchronisation at the 5×10(-19) accuracy lev...
7961455 - Characterization of a light-responding trans-activator responsible for differentially c...
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    
SUNY College of Optometry, New York, NY 10036, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Color Perception / physiology*
Discrimination (Psychology)
Macaca fascicularis
Retinal Ganglion Cells / physiology
Grant Support

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

Previous Document:  Long-term renormalization of chromatic mechanisms following cataract surgery.
Next Document:  A single mechanism for both luminance and chromatic grating vernier tasks: evidence from temporal su...