The research described in this proposal is designed to measure the precision and accuracy of observers' judgments of various surface properties and relations that could potentially be used for the perceptual representation of 3D shape. Observers will be asked to estimate the distances between visible surface points, and to compare their local orientations and curvatures. The proposed research has four major goals. One is to measure how different attributes of surface structure are perceptually scaled, and the extent to which their representations are consistent with one another. A second is to determine how higher order properties of differential structure, such as orientation and curvature, are perceptually parameterized into component dimensions. Can these components be selected arbitrarily, or are there privileged coordinate systems? A third goal of the research is to investigate the qualitative aspects of perceived surface structure. What defines identifiable parts or features on smoothly curved surfaces, and to what extent are they viewpoint invariant? Finally, additional experiments will also be performed to investigate how perceptual knowledge of spatial relations is used to guide motor actions, such as reaching to a target.
| Todd, James T; Thaler, Lore; Dijkstra, Tjeerd M H (2005) The effects of field of view on the perception of 3D slant from texture. Vision Res 45:1501-17 |
| Todd, James T; Norman, J Farley; Mingolla, Ennio (2004) Lightness constancy in the presence of specular highlights. Psychol Sci 15:33-9 |
| Todd, James T (2004) The visual perception of 3D shape. Trends Cogn Sci 8:115-21 |
| Norman, J Farley; Todd, James T; Orban, Guy A (2004) Perception of three-dimensional shape from specular highlights, deformations of shading, and other types of visual information. Psychol Sci 15:565-70 |
| Liu, Baoxia; Todd, James T (2004) Perceptual biases in the interpretation of 3D shape from shading. Vision Res 44:2135-45 |
| Todd, James T; Oomes, Augustinus H J; Koenderink, Jan J et al. (2004) The perception of doubly curved surfaces from anisotropic textures. Psychol Sci 15:40-6 |
| Todd, James T; Norman, J Farley (2003) The visual perception of 3-D shape from multiple cues: are observers capable of perceiving metric structure? Percept Psychophys 65:31-47 |
| Phillips, Flip; Todd, James T; Koenderink, Jan J et al. (2003) Perceptual representation of visible surfaces. Percept Psychophys 65:747-62 |
| Todd, James T; Oomes, Augustinus H J (2002) Generic and non-generic conditions for the perception of surface shape from texture. Vision Res 42:837-50 |
| Todd, J T; Oomes, A H; Koenderink, J J et al. (2001) On the affine structure of perceptual space. Psychol Sci 12:191-6 |
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