Changes in relative area produce equal and opposite effects on lightness and perceived illumination

SORANZO, Alessandro and GILCHRIST, Alan (2018). Changes in relative area produce equal and opposite effects on lightness and perceived illumination. In: Ecvp-abstracts -2018. sage.

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Abstract

In prior work (Gilchrist & Soranzo, ECVP 2012) in which subjects looked into two windows in the far wall of a vision tunnel and adjusted the level of illumination in one window to match that of the othe, they matched the windows for highest luminance (not average). The fact that both lightness and perceived illumination are anchored by highest luminance directly implies Koffka’s invariance theorem. For a given luminance within a framework, changing highest luminance changes lightness and perceived illumination in equal but opposite ways. In this new study, we consider area effects. We found that when a darker region is less than half of the total area within a window, Koffka’s theorem applies directly. However, when the darker region covers more than half of total area, Koffka’s principle applies to the darker region, but not the lighter one, which is anchored at white. Perceived illumination level can now be incorporated systematically into anchoring theory.

Item Type: Book Section
Research Institute, Centre or Group: Psychology Research Group
Departments: Faculty of Social Sciences and Humanities > Department of Psychology, Sociology and Politics
Depositing User: Alessandro Soranzo
Date Deposited: 12 Dec 2018 15:56
Last Modified: 28 Mar 2019 17:13
URI: http://shura.shu.ac.uk/id/eprint/21619

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