Document Detail

Contribution of bottom-up and top-down motion processes to perceived position.
MedLine Citation:
PMID:  17154779     Owner:  NLM     Status:  MEDLINE    
Perceived position depends on many factors, including motion present in a visual scene. Convincing evidence shows that high-level motion perception--which is driven by top-down processes such as attentional tracking or inferred motion--can influence the perceived position of an object. Is high-level motion sufficient to influence perceived position, and is attention to or awareness of motion direction necessary to displace objects' perceived positions? Consistent with previous reports, the first experiment revealed that the perception of motion, even when no physical motion was present, was sufficient to shift perceived position. A second experiment showed that when subjects were unable to identify the direction of a physically present motion stimulus, the apparent locations of other objects were still influenced. Thus, motion influences perceived position by at least two distinct processes. The first involves a passive, preattentive mechanism that does not depend on perceptual awareness; the second, a top-down process that depends on the perceptual awareness of motion direction. Each contributes to perceived position, but independently of the other.
David Whitney
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of experimental psychology. Human perception and performance     Volume:  32     ISSN:  0096-1523     ISO Abbreviation:  J Exp Psychol Hum Percept Perform     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-12-12     Completed Date:  2007-02-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502589     Medline TA:  J Exp Psychol Hum Percept Perform     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1380-97     Citation Subset:  IM    
Copyright Information:
(c) 2006 APA, all rights reserved.
Center for Mind and Brain, Department of Psychology, University of California, Davis, CA 95616, USA.
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MeSH Terms
Discrimination (Psychology)
Figural Aftereffect
Motion Perception*
Optical Illusions
Pattern Recognition, Visual
Space Perception*
Time Factors

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

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