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| Research article summary (published 17 Mar 2002): |
Spatiochromatic properties of natural images and human vision.
Full Abstract
The human visual system shows a relatively greater response to low spatial frequencies of chromatic spatial modulation than to luminance spatial modulation. However, previous work has shown that this differential sensitivity to low spatial frequencies is not reflected in any differential luminance and chromatic content of general natural scenes. This is contrary to the prevailing assumption that the spatial properties of human vision ought to reflect the structure of natural scenes. Now, colorimetric measures of scenes suggest that red-green (and perhaps blue-yellow) color discrimination in primates is particularly suited to the encoding of specific scenes:
reddish or yellowish objects on a background of leaves. We therefore ask whether the spatial, as well as chromatic, properties of such scenes are matched to the different spatial-encoding properties of color and luminance modulation in human vision. We show that the spatiochromatic properties of a wide class of scenes, which contain reddish objects (e.g., fruit) on a background of leaves, correspond well to the properties of the red-green (but not blue-yellow) systems in human vision, at viewing distances commensurate with typical grasping distance. This implies that the red-green system is particularly suited to encoding both the spatial and the chromatic structure of such scenes.
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Author information
Author/s: Párraga, C A (CA); Troscianko, T (T); Tolhurst, D J (DJ);
Affiliation: Department of Experimental Psychology, University of Bristol, United Kingdom. alej.parraga@bristol.ac.uk
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Current biology : CB (Curr Biol), published in England. (Language: eng)
Reference: 2002-Mar; vol 12 (issue 6) : pp 483-7
Dates: Created 2002/03/22; Completed 2002/08/12; Revised 2006/11/15;
PMID: 11909534, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
Comments and Corrections
CommentIn: Curr Biol. 2002 Apr 2;12(7):R253-5. (PMID: 11937043)
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