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An empirical study of the traditional Mach card effect

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.

Publication metadata

Author(s): Hurlbert AC; Bloj MG

Publication type: Article

Publication status: Published

Journal: Perception

Year: 2002

Volume: 31

Issue: 2

Pages: 233-246

Print publication date: 01/01/2002

ISSN (print): 0301-0066

ISSN (electronic): 1468-4233

Publisher: Pion Ltd


DOI: 10.1068/p01sp

PubMed id: 11922135


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