Identification of Surface Reflectance from Motion Cues in Fovea and Periphery H Camalan1, A Jain2, Q Zaidi2, K Doerschner1 |
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1Department of Psychology & UMRAM, Bilkent University, Turkey |
| Doerschner et al. (2012) demonstrated that image motion can be a significant factor in the perception of objects’ material qualities. Specifically, they proposed optic-flow based cues that predicted when observers would perceive a given object as shiny or as matte. These results were consistent with te Pas et al. (1996) who showed that observers are sensitive to flow field properties not only at large but also at small scales, as they may occur in the context of object recognition tasks. Interestingly te Pas et al. (1996) also found that observers’ performance did not decline when foveal information was not available. If optic flow elements can be extracted by the visual system from the periphery and if these elements in part subserve motion-based surface material perception then surface reflectance recognition performance should not decline with eccentricity. We examined this hypothesis using a 2IFC task. Stimuli were movies of matte-textured and specular novel-shaped objects rotating in depth presented either at the fovea or at 4 degrees eccentricity. Observers indicated whether the first or second object was more shiny. Our results suggest that optic-flow based cues to surface material reflectance identification must also be available in the peripheral visual field. |
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