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    
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.
K T Mullen; M A Losada
Related Documents :
309579 - Autosomal recessive incomplete achromatopsia with protan luminosity function.
7619089 - Neuroelectric concepts: form-color classification.
18342949 - Automated measurement of spatial preference in the open field test with transmitted lig...
8047409 - Perceived motion of a colored spot in a noisy achromatic background.
24792719 - Melatonin: functions and ligands.
11607379 - Photoreceptor twist: a solution to the false-color problem.
11923539 - Neural mechanisms of saccadic suppression.
16444679 - A digital micro-mirror device-based system for the microfabrication of complex, spatial...
22828629 - Plasmonic black gold by adiabatic nanofocusing and absorption of light in ultra-sharp c...
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    
Department of Ophthalmology, McGill Vision Research, McGill University, Montreal, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Color Perception*
Color Perception Tests*
Perceptual Masking*
Signal Processing, Computer-Assisted
Visual Perception

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

Previous Document:  Analysis of red/green color discrimination in subjects with a single X-linked photopigment gene.
Next Document:  Evidence for the stochastic independence of the blue-yellow, red-green and luminance detection mecha...