Document Detail

Spectrally opponent inputs to the human luminance pathway: slow +L and -M cone inputs revealed by low to moderate long-wavelength adaptation.
MedLine Citation:
PMID:  15860536     Owner:  NLM     Status:  MEDLINE    
The luminance pathway has slow (s), spectrally opponent cone inputs in addition to the expected fast (f), non-opponent inputs. The nature of these inputs to luminance flicker perception was further explored psychophysically by measuring middle- (M-) and long-wavelength-sensitive (L-) cone modulation sensitivities, M- and L-cone phase delays, and flicker spectral sensitivities under three conditions of low to moderate long-wavelength adaptation. Under these conditions we find that the luminance channel has fast M- and L-cone input signals (+fM and +fL), and slow, spectrally opponent cone input signals (+sL and -sM). The slow signals found under these conditions are therefore of the opposite polarity to those (+sM and -sL) found under more intense long-wavelength adaptation. At these less intense levels, fast and slow M-cone signals of opposite polarity (-sM and +fM) cancel at low frequencies, but then constructively interfere at intermediate frequencies (ca 12.5-22.5 Hz, depending on adapting level) because of the delay between them. In contrast, fast and slow L-cone signals of the same polarity (+sL and +fL) sum at low frequencies, but then destructively interfere at intermediate frequencies. Importantly, the spectrally opponent signals (+sL and -sM) contribute to flicker nulls without producing visible colour variation. Although its output generates an achromatic percept, the luminance channel has slow spectrally opponent as well as fast non-opponent inputs.
Andrew Stockman; Daniel J Plummer
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.     Date:  2005-04-28
Journal Detail:
Title:  The Journal of physiology     Volume:  566     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-07-04     Completed Date:  2005-09-16     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  77-91     Citation Subset:  IM    
Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK.
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MeSH Terms
Adaptation, Physiological / physiology
Color Perception / physiology*
Color Perception Tests / methods
Neuronal Plasticity / physiology*
Photic Stimulation / methods*
Retinal Cone Photoreceptor Cells / physiology*
Visual Pathways / physiology*
Grant Support
EY10206/EY/NEI NIH HHS; //Wellcome Trust

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