Document Detail

Discrimination and identification of periodic motion trajectories.
MedLine Citation:
PMID:  21750306     Owner:  NLM     Status:  MEDLINE    
Humans are extremely sensitive to radial deformations of static circular contours (F. Wilkinson, H. R. Wilson, & C. Habak, 1998). Here, we investigate detection and identification of periodic motion trajectories defined by these radial frequency (RF) patterns over a range of radial frequencies of 2-5 cycles. We showed that the average detection thresholds for RF trajectories range from 1 to 4 min of arc and performance improves as a power-law function of radial frequency. RF trajectories are also detected for a range of speeds. We also showed that spatiotemporal global processing is involved in trajectory detection, as improvement in detection performance with increasing radial deformation displayed cannot be accounted for by local probability summation. Finally, identification of RF trajectories is possible over this RF range. Overall thresholds are about 6 times higher than previously reported for static stimuli. These novel stimuli should be a useful tool to investigate motion trajectory learning and discrimination in humans and other primates.
Charles C-F Or; Michel Thabet; Frances Wilkinson; Hugh R Wilson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-07-12
Journal Detail:
Title:  Journal of vision     Volume:  11     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2011  
Date Detail:
Created Date:  2011-07-13     Completed Date:  2011-11-18     Revised Date:  2013-01-09    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  -     Citation Subset:  IM    
Centre for Vision Research, York University, Toronto, ON, Canada.
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MeSH Terms
Discrimination (Psychology) / physiology*
Models, Theoretical
Motion Perception / physiology*
Photic Stimulation / methods*
Sensory Thresholds / physiology*
Young Adult
Grant Support
//Canadian Institutes of Health Research
Erratum In:
J Vis. 2011;11(9). doi: 10.1167/11.9.8

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

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