Document Detail

Global cooperativity of the short-range process in apparent movement: evidence obtained with contour-containing stimuli.
MedLine Citation:
PMID:  2345689     Owner:  NLM     Status:  MEDLINE    
Previous research has demonstrated that the short-range process in apparent movement, as studied with random-dot cinematograms, exhibits global cooperativity; that is, computations performed by local elements interact nonlinearly and are pooled. Other research using displays containing extended contours has implicated the short-range process, but has never demonstrated global cooperativity. In the first of four experiments, it was shown that under certain conditions of presentation, a short-range motion percept exhibiting apparent global cooperativity can be obtained when collections of randomly located contours are rotated about the center of a display, despite the fact that the displacement of peripheral contours falls outside the normal limit of the short-range process. Experiments 2-4 were conducted to provide further evidence that the observed motion is short-range (i.e., it can be disrupted by illuminating the interstimulus interval or with dichoptic viewing) and that the percept is globally cooperative (i.e., masking the center of the display, where separations between corresponding elements across frames are smallest, results in a decline in the frequency of reports of the short-range percept). Control observations suggest that the effect produced with masks was not due to a decrease in the number of elements in the display. The argument that the display exhibits a short-range process with global cooperativity is further developed.
J T Petersik
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception & psychophysics     Volume:  47     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-07-05     Completed Date:  1990-07-05     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  360-8     Citation Subset:  C    
Department of Psychology, Ripon College, WI 54971.
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MeSH Terms
Discrimination Learning
Form Perception*
Motion Perception*
Optical Illusions*

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

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