Illumination Frame of Reference in the Object-Reviewing Paradigm: A Case of Luminance and Lightness

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Abstract

The present study combines the object-reviewing paradigm (Kahneman, Treisman, & Gibbs, 1992) with the checkershadow illusion (Adelson, 1995) to contrast the effects of objects' luminance versus lightness on the object-specific preview benefit. To this end, we manipulated objects' luminance and the amount of illumination given by an informative background scene in experiments. In line with previous studies (Moore, Stephens, & Hein, 2010), there was no object-specific preview benefit when objects were presented on a uniformly colored background and luminance switched between objects. In contrast, when objects were presented on the checkershadow illusion background which provided an explanation for the luminance switch, a reliable object-specific preview benefit was observed. This suggests that object correspondence as measured by the object-reviewing paradigm can be influenced by scene-induced, perceived lightness of objects' surfaces. We replicated this finding and moreover showed that the scene context only influences the object-specific preview benefit if the objects are perceived as part of the background scene.

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