Photometric, geometric and perceptual factors in illumination-independent lightness constancy

SORANZO, Alessandro and AGOSTINI, Tiziano (2006). Photometric, geometric and perceptual factors in illumination-independent lightness constancy. Attention, Perception & Psychophisics, 68 (1), 102-113.

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It has been shown that lightness constancy depends on the articulation of the visual field (Agostini & Galmonte, 1999). However, among researchers there is little agreement about the meaning of “articulation.” Beyond the terminological heterogeneity, an important issue remains: What factors are relevant for the stability of surface color perception? Using stimuli with two fields of illumination, we explore this issue in three experiments. In Experiment 1, we manipulated the number of luminances, the number of reflectances, and the number of surfaces and their spatial relationships; in Experiment 2, we manipulated the luminance range; finally, in Experiment 3 we varied the number of surfaces crossed by the illumination edge. We found that there are two relevant factors in optimizing lightness constancy: (1) the lowest luminance in shadow and (2) the co-presence of patches of equal reflectance in both fields of illumination. The latter effect is larger if these patches strongly belong to each other. We interpret these findings within the albedo hypothesis.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Psychology Research Group
Page Range: 102-113
Depositing User: Alessandro Soranzo
Date Deposited: 25 Sep 2012 08:58
Last Modified: 18 Mar 2021 04:31

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