Document Detail

Poor visibility of motion in depth is due to early motion averaging.
MedLine Citation:
PMID:  12535995     Owner:  NLM     Status:  MEDLINE    
Under a variety of conditions, motion in depth from binocular cues is harder to detect than lateral motion in the frontoparallel plane. This is surprising, as the nasal-temporal motion in the left eye associated with motion in depth is easily detectable, as is the nasal-temporal motion in the right eye. It is only when the two motions are combined in binocular viewing that detection can become difficult. We previously suggested that the visibility of motion-in-depth is low because early stereomotion detectors average left and right retinal motions. For motion in depth, a neural averaging process would produce a motion signal close to zero. Here we tested the averaging hypothesis further. Specifically we asked, could the reduced visibility observed in previous experiments be associated with depth and layout in the stimuli, rather than motion averaging? We used anti-correlated random dot stereograms to show that, despite no depth being perceived, it is still harder to detect motion when it is presented in opposite directions in the two eyes than when motion is presented in the same direction in the two eyes. This suggests that the motion in depth signal is lost due to early motion averaging, rather than due to the presence of noise from the perceived depth patterns in the stimulus.
Julie M Harris; Simon K Rushton
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Vision research     Volume:  43     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-01-21     Completed Date:  2003-06-06     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  385-92     Citation Subset:  IM    
Department of Psychology, University of Newcastle upon Tyne, Henry Wellcome Building, Framlington Place, NE2 4HH, Newcastle, UK.
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MeSH Terms
Depth Perception / physiology*
Motion Perception / physiology*
Pattern Recognition, Visual / physiology
Photic Stimulation / methods
Vision Disparity / physiology
Vision, Binocular / physiology

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