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Parallel detection of violations of color constancy.
Foster, D H; Nascimento, S M; Amano, K; Arend, L; Linnell, K J; Nieves, J L; Plet, S; Foster, J S.
Affiliation
  • Foster DH; Visual and Computational Neuroscience Group, Department of Optometry and Neuroscience, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom. d.h.foster@umist.ac.uk
Proc Natl Acad Sci U S A ; 98(14): 8151-6, 2001 Jul 03.
Article in En | MEDLINE | ID: mdl-11438751
The perceived colors of reflecting surfaces generally remain stable despite changes in the spectrum of the illuminating light. This color constancy can be measured operationally by asking observers to distinguish illuminant changes on a scene from changes in the reflecting properties of the surfaces comprising it. It is shown here that during fast illuminant changes, simultaneous changes in spectral reflectance of one or more surfaces in an array of other surfaces can be readily detected almost independent of the numbers of surfaces, suggesting a preattentive, spatially parallel process. This process, which is perfect over a spatial window delimited by the anatomical fovea, may form an early input to a multistage analysis of surface color, providing the visual system with information about a rapidly changing world in advance of the generation of a more elaborate and stable perceptual representation.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Color Perception / Models, Theoretical Type of study: Diagnostic_studies Limits: Humans Language: En Journal: Proc Natl Acad Sci U S A Year: 2001 Document type: Article Affiliation country: United kingdom Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Color Perception / Models, Theoretical Type of study: Diagnostic_studies Limits: Humans Language: En Journal: Proc Natl Acad Sci U S A Year: 2001 Document type: Article Affiliation country: United kingdom Country of publication: United States