Document Detail

Assimilation of achromatic color cannot explain the brightness effects in the achromatic neon effect.
MedLine Citation:
PMID:  10209646     Owner:  NLM     Status:  MEDLINE    
If the mouths of the pacmen of a Kanizsa square are colored, for example red, then an illusory red transparent square is seen. In many visual theories such 'neon color spreading' is explained by assimilation of chromatic and achromatic color. In this paper the achromatic case was investigated. In a two-alternative forced-choice task thirty observers judged the brightness of achromatic neon figures. The results suggest that assimilation of achromatic color inside and/or outside of the illusory figures cannot explain the brightness effects seen in achromatic neon color spreading. Although these displays may produce assimilation, it appears that contrast (perhaps acting nonlocally) is a stronger influence on their perceived brightness.
M K Albert
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Perception     Volume:  27     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  1998  
Date Detail:
Created Date:  1999-05-06     Completed Date:  1999-05-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  839-49     Citation Subset:  IM    
Vision Sciences Laboratory, Harvard University, Cambridge, MA 02138, USA.
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MeSH Terms
Color Perception / physiology*
Contrast Sensitivity / physiology*
Optical Illusions*
Psychological Tests
Grant Support
Comment In:
Perception. 1999;28(10):1291-302   [PMID:  10694976 ]

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