Uji, Makoto and Lingnau, Angelika and Cavin, Ian and Vishwanath, Dhanraj (2019) Identifying Cortical Substrates Underlying the Phenomenology of Stereopsis and Realness: A Pilot fMRI Study. FRONTIERS IN NEUROSCIENCE, 13: 646. ISSN 1662-453X,
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Viewing a real scene or a stereoscopic image (e.g., 3D movies) with both eyes yields a vivid subjective impression of object solidity, tangibility, immersive negative space and sense of realness; something that is not experienced when viewing single pictures of 3D scenes normally with both eyes. This phenomenology, sometimes referred to as stereopsis, is conventionally ascribed to the derivation of depth from the differences in the two eye's images (binocular disparity). Here we report on a pilot study designed to explore if dissociable neural activity associated with the phenomenology of realness can be localized in the cortex. In order to dissociate subjective impression from disparity processing, we capitalized on the finding that the impression of realness associated with stereoscopic viewing can also be generated when viewing a single picture of a 3D scene with one eye through an aperture. Under a blocked fMRI design, subjects viewed intact and scrambled images of natural 3-D objects, and scenes under three viewing conditions: (1) single pictures viewed normally with both eyes (binocular); (2) single pictures viewed with one eye through an aperture (monocular-aperture); and (3) stereoscopic anaglyph images of the same scenes viewed with both eyes (binocular stereopsis). Fixed-effects GLM contrasts aimed at isolating the phenomenology of stereopsis demonstrated a selective recruitment of similar posterior parietal regions for both monocular and binocular stereopsis conditions. Our findings provide preliminary evidence that the cortical processing underlying the subjective impression of realness may be dissociable and distinct from the derivation of depth from disparity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BINOCULAR DISPARITY; STEREOSCOPIC DEPTH; 3D SHAPE; FUNCTIONAL-ORGANIZATION; INTRAPARIETAL SULCUS; SURFACE ORIENTATION; 3-DIMENSIONAL SHAPE; VISUAL-CORTEX; PARIETAL CORTEX; DORSAL; realness; stereopsis; fMRI; parietal cortex; intraparietal sulcus; 3D perception; depth perception |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Human Sciences > Institut für Psychologie > Lehrstuhl für Cognitive Neuroscience – Prof. Dr. Angelika Lingnau |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 08:29 |
| Last Modified: | 07 Apr 2020 08:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26638 |
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