AI Article Synopsis
- The study reveals that how we perceive 3D shapes with binocular disparity changes based on whether we view parts as a single object or not.
- In experiments, cubes with different motion cues showed that when parts were seen as one object, they moved as a whole rather than as separate components, defying the expected motion based on binocular signals.
- The results underscore that prior knowledge and interpretation of objects influence perception, suggesting that depth cues like binocular disparity have less importance than previously thought when interpreting 3D shapes.
Article Abstract
We report a new phenomenon, which illustrates that the role of binocular disparity in 3D shape perception critically depends on whether the parts are interpreted as belonging to a single object. The nature of this phenomenon was studied in four experiments. In the first two experiments the subjects were shown a sequence of stereoscopic images of a cube, in which binocular disparity indicated that the individual parts move towards or away from one eye. However, when the parts of the cube were perceived as elements of a single object, they appeared to move in a rigid fashion and the direction of motion was orthogonal to that predicted by the binocular disparities. The third experiment generalized these results to more complex polyhedra. The last experiment showed that constraints related to motion, such as rigidity, are important, but not critical for this phenomenon to occur. All these results imply that the interpretation as to what corresponds to a single object affects the importance (weight) of binocular disparity and may even eliminate its contribution altogether; the percept of a 3D shape is dominated by a priori constraints, and depth cues play a secondary role.
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| http://dx.doi.org/10.1016/j.visres.2005.02.011 | DOI Listing |
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