Document Detail

Color enhances Mach bands detection threshold and perceived brightness.
MedLine Citation:
PMID:  8273295     Owner:  NLM     Status:  MEDLINE    
We have previously argued that unless color and luminance are shown to be processed independently, using isoluminant stimuli may not reveal the full contribution of color to visual functioning. Here we study the interaction of color and luminance in a task, Mach bands detection and perceived brightness, where color by itself is not effective at all. Subjects viewed luminance or color/luminance ramps and had to determine in either case the luminance contrast necessary for detecting Mach bands and, in another experiment, to compare the brightness of the bands in the luminance and in the combined displays. Isoluminant color displays did not generate any Mach bands, but the addition of color to the luminance display lowered Mach bands detection thresholds and enhanced their perceived brightness. It is thus concluded that the failure to perceive Mach bands in an isoluminant display is not indicative of the lack of color contribution to spatial vision but rather indicates that the strong effect that color has on contrast enhancement mechanisms can be revealed if color and luminance are allowed to interact.
M Gur; G Syrkin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  33     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1993 Nov 
Date Detail:
Created Date:  1994-02-02     Completed Date:  1994-02-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2313-9     Citation Subset:  IM    
Department of Biomedical Engineering, Technion, Haifa, Israel.
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MeSH Terms
Color Perception / physiology*
Optical Illusions / physiology*
Pattern Recognition, Visual / physiology
Sensory Thresholds / physiology

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