The goal is to analyze the spatial structure of the processing mechanisms at three levels of the human depth reconstruction process. The proposal is motivated by a 5-stage framework for the convergence of binocular information into a unified depth map of the 3D surfaces confronting the observer. Despite past work on depth processing, many properties of the depth reconstruction process at each level of this framework are still unresolved, particularly the tunings of the channel structure at each processing level. The proposal focuses on evaluation of three levels of the framework with three psychophysical tools: detectability of depth, the depth aftereffect of adaptation to disparity and monocular depth cues, and the form aftereffect of adaptation to the form of a depth image without depth adaptation as such. These tools will be applied to determine the functional organization at the level of the inputs to depth processing, the mechanisms of depth reconstruction and the recognition of the form of the resulting depth image. Although stereopsis is generally viewed as the strongest component of perceived depth, there are many other monocular depth cues that can be processed in parallel to generate dramatic depth impressions (such as differential motion cues, perspective, shape-from-shading, texture gradient, blur, interposition and so on), whose interaction with stereoscopic depth cues has generated much recent interest. A key topic of the proposal is the degree of convergence of these mechanisms into a unified map of the 3D surfaces confronting the observer.
| Tyler, C W; Kontsevich, L L; Ferree, T C (2008) Independent components in stimulus-related BOLD signals and estimation of the underlying neural responses. Brain Res 1229:72-89 |
| Likova, Lora T; Tyler, Christopher W (2007) Stereomotion processing in the human occipital cortex. Neuroimage 38:293-305 |
| Tyler, Christopher W; Likova, Lora T; Kontsevich, Leonid L et al. (2006) The specificity of cortical region KO to depth structure. Neuroimage 30:228-38 |
| Tyler, Christopher W; Kontsevich, Leonid L (2005) The structure of stereoscopic masking: position, disparity, and size tuning. Vision Res 45:3096-108 |
| Tyler, Christopher W (2004) Representation of stereoscopic structure in human and monkey cortex. Trends Neurosci 27:116-8; discussion 118-20 |
| Likova, Lora T; Tyler, Christopher W (2003) Spatiotemporal relationships in a dynamic scene: stereomotion induction and suppression. J Vis 3:304-17 |
| Chen, Chien-Chung; Tyler, Christopher W; Baseler, Heidi A (2003) Statistical properties of BOLD magnetic resonance activity in the human brain. Neuroimage 20:1096-109 |
| Likova, Lora T; Tyler, Christopher W (2003) Peak localization of sparsely sampled luminance patterns is based on interpolated 3D surface representation. Vision Res 43:2649-57 |
| Norcia, Anthony M; Candy, T Rowan; Pettet, Mark W et al. (2002) Temporal dynamics of the human response to symmetry. J Vis 2:132-9 |
| Cavanagh, Patrick; Anstis, Stuart (2002) The boogie-woogie illusion. Perception 31:1005-11 |
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