Document Detail

Speed constancy and the perception of distance.
MedLine Citation:
PMID:  18399244     Owner:  NLM     Status:  MEDLINE    
The distance-calibration hypothesis states that retinal velocity is scaled by using distance cues, and judged velocity remains unchanged when distance is changed. The relational hypothesis states that judged velocity depends on retinal velocities, and is proportional to judged distance. These hypotheses were compared in three experiments where the movements of the standard stimulus and the comparison stimulus were manipulated by the ratio of the angular velocity of the comparison stimulus to the angular velocity of the standard stimulus. The presentation conditions of the standard stimulus and the comparison stimulus, and the colour cues of the two stimuli were also manipulated in order to change the strength of the cues available to the observers. The results indicate that judged velocities and the relationship of judged distance and velocity depend on the strength of the cues. When cues are strong, the distance-calibration hypothesis adequately explains speed constancy. When cues are weak, judged velocity and the relationship between judged distance and velocity are consistent with the prediction of the relational hypothesis. The perceived speed of a stimulus depends not only on the physical speed of the stimulus but also on non-motion cues, some of which are distance cues involved in depth perception.
Junko Tozawa
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Perception     Volume:  37     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2008  
Date Detail:
Created Date:  2008-04-10     Completed Date:  2008-08-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  3-21     Citation Subset:  IM    
Department of Information and Communication Sciences, Kawamura Gakuen Woman's University, Sageto 1133, Abiko-city, Chiba 270-1138, Japan.
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MeSH Terms
Analysis of Variance
Computer Graphics
Distance Perception / physiology
Linear Models
Motion Perception / physiology*
Vision Disparity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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