Document Detail

Identifying contours from occlusion events.
MedLine Citation:
PMID:  2243757     Owner:  NLM     Status:  MEDLINE    
Surface contours specified by occlusion events that varied in density, velocity, and type of motion (rotation or translation) were examined in four experiments. As a fourth experimental factor, there were both figure-motion trials (the occluding surface moved over a stationary background) and background-motion trials (the background moved behind a stationary surface) in each experiment. Displays contained line patterns and rotary motion (Experiment 1), line patterns and translatory motion (Experiment 2), textured surfaces and rotary motion (Experiment 3), and textured surfaces and translatory motion (Experiment 4). Results indicate that contour identifications are more accurate with translation than with rotation, and that background-motion trials are generally easier than figure-motion trials. Although density in all experiments affected identifications in both background- and figure-motion trials, velocity did so in Experiment 4 only. In Experiments 1, 2, and 3, velocity affected identifications in background-motion trials but not in figure-motion trials. In Experiments 3 and 4, the rate of accretion and deletion of texture was a poor predictor of identification accuracy. These results are not consistent with previous accounts of contour perception from occlusion events, and may reflect an involvement of ocular pursuit as a mechanism for registering contour information.
N Bruno; M Bertamini
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception & psychophysics     Volume:  48     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1990 Oct 
Date Detail:
Created Date:  1991-01-03     Completed Date:  1991-01-03     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  331-42     Citation Subset:  C    
University of Padua, Italy.
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MeSH Terms
Discrimination Learning
Form Perception*
Motion Perception*
Perceptual Masking*

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

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