Document Detail

The perceived rigidity of rotating eight-vertex geometric forms: extracting nonrigid structure from rigid motion.
MedLine Citation:
PMID:  9536377     Owner:  NLM     Status:  MEDLINE    
In four experiments, subjects examined four categories of rotating eight-vertex geometric forms in parallel projection. Some of the figures appeared to deform, even though rigid three-dimensional interpretations were possible mathematically. Our results from several deformation-rating tasks indicated that most of the configurations maintained a rigid appearance throughout their rotations, although one category of stimuli appeared to deform more frequently than the others. Configurations from the category that contained a high proportion of stimuli that appeared to deform were also shown to be more difficult to discriminate from stimuli that had no rigid three-dimensional interpretation (measured using a signal detection task). To account for these findings, a theory was formulated based on the use of monocular depth cues in the perception of shape. Static monocular depth cues we define as those which are present in non-moving stimuli and Dynamic monocular depth cues are those that are only present in moving stimuli. We conclude that static cues dominate the perception of shape when humans respond to parallel (and, most likely, polar) projections of rotating objects with rigid three-dimensional interpretations. Further, subjects cannot respond to the motion or acceleration profile of part of such a stimulus without responding to the figure as a whole.
J E Sparrow; W W Stine
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  38     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-04-15     Completed Date:  1998-04-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  541-56     Citation Subset:  IM; S    
Division of Natural and Social Sciences, University of New Hampshire at Manchester 03102, USA.
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MeSH Terms
Depth Perception / physiology
Discrimination (Psychology) / physiology
Form Perception / physiology*
Models, Biological
Motion Perception / physiology*

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