Document Detail


The spatial tuning of color and luminance peripheral vision measured with notch filtered noise masking.
MedLine Citation:
PMID:  10341959     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have measured the spatial bandwidths of the bandpass red-green chromatic and luminance mechanisms at four locations in the nasal visual field (0, 10, 20 and 30 degrees) using a method of notch filtered noise masking which effectively removes the artifact of off-frequency looking for our stimuli. Detection thresholds were measured for luminance or isoluminant red-green Gaussian enveloped test gratings of 0.5 cpd embedded in 1/f noise. Firstly, thresholds were obtained as a function of increasing noise spectral density and were fitted using a standard noise masking model. These results support the existence across the visual field of independent, red-green chromatic and luminance mechanisms with similar sampling efficiencies. Secondly, we measured thresholds in notch filtered noise as a function of notch width and derived the spatial bandwidth of the detection mechanism. We find both color and luminance mechanisms have similar bandwidths which remain virtually constant across eccentricity. These results indicate strong overall similarities between the early processing of color and luminance vision, and lend support to the role of color as an 'intrinsic image' in spatial vision. The results are discussed in the light of the anchored channel and shifting channel models of peripheral contrast sensitivity and pattern detection.
Authors:
K T Mullen; M A Losada
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  39     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1999 Feb 
Date Detail:
Created Date:  1999-06-15     Completed Date:  1999-06-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  721-31     Citation Subset:  IM    
Affiliation:
Department of Ophthalmology, McGill Vision Research, McGill University, Montreal, Canada. kmullen@violet.vision.mcgill.ca
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MeSH Terms
Descriptor/Qualifier:
Color Perception*
Color Perception Tests*
Humans
Perceptual Masking*
Signal Processing, Computer-Assisted
Visual Perception

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


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