Document Detail

Differential intrinsic bias of the 3-D perceptual environment and its role in shape constancy.
MedLine Citation:
PMID:  21927826     Owner:  NLM     Status:  MEDLINE    
In a three-dimensional (3-D) environment, sensory information is projected on a 2-D retina with the consequence that the visual system needs space information for accurately reconstructing the visual world. However, the 3-D environment is not accurately represented in the brain; in particular, the perception of distances in depth is imprecise. It has been argued that the visual system has an intrinsic bias of visual space where targets located on the ground floor are perceived on an implicit elevated surface. We studied how such an intrinsic bias of visual space affects shape constancy. We found that the projected shape of a semicircle can be explained taking into account a differential implicit slant surface. The depth/width ratio, which is a measure for the shape of the stimulus, is overestimated for angular declination smaller than ~60°, while it is underestimated for larger angular declinations. Our results are important for explaining shape constancy and may be important for understanding some perceptual illusions.
Antonio Aznar-Casanova; Matthias Sven Keil; Manuel Moreno; Hans Supèr
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-09-17
Journal Detail:
Title:  Experimental brain research     Volume:  215     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-10-14     Completed Date:  2012-07-25     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  35-43     Citation Subset:  IM    
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MeSH Terms
Imaging, Three-Dimensional / methods*
Photic Stimulation / methods*
Psychomotor Performance / physiology*
Space Perception / physiology*

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