Document Detail

A new look at binocular stereopsis.
MedLine Citation:
PMID:  15924939     Owner:  NLM     Status:  MEDLINE    
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.
Zygmunt Pizlo; Yunfeng Li; Gregory Francis
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Publication Detail:
Type:  Journal Article     Date:  2005-03-17
Journal Detail:
Title:  Vision research     Volume:  45     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-05-31     Completed Date:  2005-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2244-55     Citation Subset:  IM    
Department of Psychological Sciences, Purdue University, 703 Third Street, West Lafayette, IN 47907-2081, USA.
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MeSH Terms
Depth Perception / physiology*
Motion Perception / physiology
Orientation / physiology
Pattern Recognition, Visual / physiology
Photic Stimulation / methods
Vision Disparity / physiology
Vision, Binocular / physiology*
Vision, Monocular / physiology

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