Document Detail

The influence of restricted viewing conditions on egocentric distance perception: implications for real and virtual indoor environments.
MedLine Citation:
PMID:  15832569     Owner:  NLM     Status:  MEDLINE    
We carried out three experiments to examine the influence of field of view and binocular viewing restrictions on absolute distance perception in real-world indoor environments. Few of the classical visual cues provide direct information for accurate absolute distance judgments to points in the environment beyond about 2 m from the viewer. Nevertheless, in previous work it has been found that visually directed walking tasks reveal accurate distance estimations in full-cue real-world environments to distances up to 20 m. In contrast, the same tasks in virtual environments produced with head-mounted displays (HMDs) show large compression of distance. Field of view and binocular viewing are common limitations in research with HMDs, and have been rarely studied under full pictorial-cue conditions in the context of distance perception in the real-world. Experiment 1 showed that the view of one's body and feet on the floor was not necessary for accurate distance perception. In experiment 2 we manipulated the horizontal and the vertical field of view along with head rotation and found that a restricted field of view did not affect the accuracy of distance estimations when head movement was allowed. Experiment 3 showed that performance with monocular viewing was equal to that with binocular viewing. These results have implications for the information needed to scale egocentric distance in the real-world and reduce the support for the hypothesis that a limited field of view or imperfections in binocular image presentation are the cause of the underestimation seen with HMDs.
Sarah H Creem-Regehr; Peter Willemsen; Amy A Gooch; William B Thompson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Perception     Volume:  34     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2005  
Date Detail:
Created Date:  2005-04-18     Completed Date:  2005-06-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  191-204     Citation Subset:  IM    
Department of Psychology, University of Utah, Salt Lake City, UT 84112, USA.
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MeSH Terms
Distance Perception / physiology*
Head Movements / physiology
Perceptual Masking / physiology*
Sensory Deprivation / physiology
Vision, Binocular / physiology
Vision, Monocular / physiology
Walking / physiology

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