van der Kooij K, Pas S F t, 2008, "Integration of shape and surround across cue modalities" Perception 37 ECVP Abstract Supplement, page 124
Integration of shape and surround across cue modalities
K van der Kooij, S F te Pas
Context can bias shape perception, as in illusions of shape contrast. Shape is perceived from a combination of depth cues and cue-dependent as well as cue-independent representations exist. We answer the question whether the integration of shape and surround is mediated by both types of representations. To this end, we presented shape and surround in the same or different depth cues and compared context biases in both conditions. A central hinged plane and larger flanking plane were defined by binocular disparity or motion. In a 'within-cue' condition, shape and flankers were defined by the same cue and in a 'cross-cue' condition they were defined by a different cue (binocular disparity or motion). Subjects compared the dihedral angle of the central shape with a constant reference. This way, we could compute the bias. In the within-cue condition there was a contrast bias whereas we found an attraction bias in the cross-cue condition. We conclude that the integration of shape and surround is mediated by both cue-dependent and cue-independent representations.
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