Perception of 3D shape in context: contrast and assimilation.
Whereas integration of shape and surround is held to occur through cue-dependent representations, we show that both cue-invariant and cue-dependent representations are involved. A central hinged plane and larger flanking plane were defined by either binocular disparity or motion. In a 'within-cue' condition, shape and surround were defined by the same cue and in a 'cross-cue' condition they were defined by a different cue. Observers compared the dihedral angle of the central shape with a constant reference. When the central shape was defined by disparity, the surround stimuli invoked a contrast bias in the within-cue condition, but shape assimilation occurred in the cross-cue condition. When the central shape was defined by motion there were overall no significant results, but if a contrast bias was observed, it was in the within-cue condition where integration could occur through cue-dependent representations.
van der Kooij
Katinka
K
Helmholtz Institute, Experimental Psychology Division, Universiteit Utrecht, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands. k.vanderkooij@uu.nl
te Pas
Susan F
SF
D015350:Contrast Sensitivity / Q000502:physiology*; D003463:Cues; D003867:Depth Perception / Q000502:physiology*; D005364:Field Dependence-Independence; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011594:Psychometrics; D011601:Psychophysics; D015357:Vision Disparity / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology