Some varieties of shadow illusions: split shadows, occluded shadows, stolen shadows, and shadows of shadows |
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Authors: | Casati Roberto |
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Institution: | Institut Jean Nicod, CNRS-EHESS-ENS, Paris. casati@ehess.fr |
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Abstract: | Shadows are visual objects and as such are subject to preference rules for segmenting the visual scene (such as Gestalt laws). These rules govern shadows along two dimensions: their general unity and individuation (eg they describe a certain area as a unitary shadow as opposed to a set of two distinct shadows), and their being the shadow of a given object, as opposed to being the shadow of any other object in the scene (the shadow correspondence problem Mamassian, 2004 Perception 33 1279-1290). I describe a few phenomena that indicate the interplay of preferences in determining the final visual aspect of scenes in which shadows are present. |
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