Document Detail

Off on the wrong foot: local features in biological motion.
MedLine Citation:
PMID:  19522321     Owner:  NLM     Status:  MEDLINE    
Biological-motion perception consists of a number of different phenomena. They include global mechanisms that support the retrieval of the coherent shape of a walker, but also mechanisms which derive information from the local motion of its parts about facing direction and animacy, independent of the particular shape of the display. A large body of the literature on biological-motion perception is based on a synthetic stimulus generated by an algorithm published by James Cutting in 1978 (Perception 7 393-405). Here we show that this particular stimulus lacks a visual invariant inherent to the local motion of the feet of a natural walker, which in more realistic motion patterns indicates the facing direction of a walker independent of its shape. Comparing Cutting's walker to a walker derived from motion-captured data of real human walkers, we find no difference between the two displays in a detection task designed such that observers had to rely on global shape. In a direction discrimination task, however, in which only local motion was accessible to the observer, performance on Cutting's walker was at chance, while direction could still be retrieved from the stimuli derived from the real walker.
Daniel R Saunders; Julia Suchan; Nikolaus F Troje
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception     Volume:  38     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2009  
Date Detail:
Created Date:  2009-06-15     Completed Date:  2010-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  522-32     Citation Subset:  IM    
Department of Psychology, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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MeSH Terms
Analysis of Variance
Biomechanics / physiology
Discrimination (Psychology)*
Motion Perception / physiology*
Pattern Recognition, Visual*
Photic Stimulation / methods
Young Adult

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