Document Detail

Apparent motion distorts the shape of a stimulus briefly presented along the motion path.
MedLine Citation:
PMID:  21106680     Owner:  NLM     Status:  MEDLINE    
We examined whether motion blur accompanying apparent motion (AM) affects the shape of a stimulus presented in the motion path. In a two-alternative forced-choice procedure, observers judged the shape of a Gaussian test stimulus flashed in the path of motion, relative to a reference stimulus, which was a circular Gaussian stimulus located away from the path of motion. In Experiment 1, we report that the test stimulus was affected by AM and its perceived width was wider than its actual width, and counteracting this distortion, shape discrimination thresholds coincided with a test stimulus that was physically "thinner" than the reference stimulus. Shape distortion correlated with the strength of AM (Experiment 2) and increased within the range of inter-stimulus intervals used to induce AM and with retinal eccentricity but was eliminated when the test stimulus was made "hard-edged" (Experiment 3) or when the stimulus does not overlap with the motion path (Experiment 4). In Experiment 5, we demonstrate that the effect is present for dichoptic presentations. These results can be accounted for by a process in which the neural representation of AM generated by higher cortical areas feedback to interfere with the coding of stimulus shape by units located along the trajectory of AM.
Sieu K Khuu; Jack Phu; Shazaan Khambiye
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-11-24
Journal Detail:
Title:  Journal of vision     Volume:  10     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2010  
Date Detail:
Created Date:  2010-11-25     Completed Date:  2011-03-04     Revised Date:  2013-01-09    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  15     Citation Subset:  IM    
The School of Optometry and Vision Science, The University of New South Wales, Sydney, NSW 2052, Australia.
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MeSH Terms
Depth Perception / physiology*
Discrimination (Psychology) / physiology
Form Perception / physiology*
Motion Perception / physiology*
Normal Distribution
Perceptual Distortion / physiology*
Photic Stimulation / methods
Sensory Thresholds / physiology
Visual Cortex / physiology*
Young Adult

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