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| Research article summary (published 30 Dec 2001): |
An empirical study of the traditional Mach card effect.
Full Abstract
The traditional achromatic Mach card effect is an example of lightness inconstancy and a demonstration of how shape and lightness perception interact. We present a quantitative study of this phenomenon and explore the conditions under which it occurs. The results demonstrate that observers show lightness constancy only when sufficient information is available about the light-source position, and the perceptual task required of them is surface identification rather than direct colour-appearance matching. An analysis and comparison of these results with the chromatic Mach card effect (Bloj et al 1999 Nature 402 877-879) demonstrate that the luminance effects of mutual illumination do not account for the change in lightness perception in the traditional Mach card.
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Author information
Author/s: Bloj, Marina G (MG); Hurlbert, Anya C (AC);
Affiliation: Department of Optometry, University of Bradford, UK. m.bloj@brad.ac.uk
Journal and publication information
Publication Type: Journal Article
Journal: Perception (Perception), published in England. (Language: eng)
Reference: 2002-; vol 31 (issue 2) : pp 233-46
Dates: Created 2002/03/29; Completed 2002/04/25; Revised 2004/11/17;
PMID: 11922135, 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.
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