Lookup NU author(s): Dr Marina Bloj,
Professor Anya Hurlbert
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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.
Author(s): Hurlbert AC; Bloj MG
Publication type: Article
Publication status: Published
Print publication date: 01/01/2002
ISSN (print): 0301-0066
ISSN (electronic): 1468-4233
Publisher: Pion Ltd
PubMed id: 11922135
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