The role of monocular regions in the perception of stereoscopic surfaces S Wardle1, B Gillam1, S Palmisano2 |
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1School of Psychology, The University of New South Wales, Australia |
| Binocular viewing of 3D scenes produces portions of the background that are only visible to one eye because of occlusion and interocular separation. Here we investigate the effect of monocular regions on perceived slant. It is well-known that horizontal stereoscopic slant is under-estimated for isolated surfaces. The addition of monocular regions significantly increases perceived slant [Gillam & Blackburn, 1998, Perception, 27, 1267-1286] however, the underlying mechanisms are unknown. Two probes equidistant from a slanted surface appear offset in depth as a result of the underestimated slant. We predicted that this bias would be reduced when monocular regions were present, as they increase perceived slant. The PSE was measured for two probes in front of slanted random-textured surfaces, with and without monocular regions. Bias was present for isolated surfaces with stereoscopic slants of +/-21 and 36 deg, with a larger bias for the latter. Surprisingly, the bias was not reduced by adding monocular regions. This contradicts the finding that monocular regions increase perceived slant and also that increasing stereoscopic slant by contrast does reduce bias [Gillam et al, 2011, Journal of Vision, 11(6):5, 1–14]. We discuss possible explanations in the context of physiological results from cells selective for depth edges. |
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