Recent studies have shown that several scene-based properties can be determined rapidly and in parallel at preattentive levels, including surface convexity and concavity (Ramachandran, 1988), direction of illumination (Enns & Rensink, 1990), and three-dimensional orientation (Enns & Rensink, 1991). We show that in addition to these properties, preattentive vision is also sensitive to scene structure defined by shadows.
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