Document Detail

Classifying illusory contours: edges defined by "pacman" and monocular tokens.
MedLine Citation:
PMID:  9065845     Owner:  NLM     Status:  MEDLINE    
Thresholds for the discrimination of orientation were measured in the human fovea for figures and borders delineated by solid lines and by "pacman" tokens as introduced by Kanizsa, as well as by contours induced by monocular tokens giving a stereoscopic depth illusion of a knife edge. Orientation discrimination of these illusory contours is poorer by a factor of approximately 2 than that of equivalent contours made of solid lines and is not much better than that for their supporting structures if taken alone. It is concluded that these kinds of illusory borders do not address the "border" or "edge" mechanism in the same way as real lines. Orientation discrimination and simultaneous orientation contrast (tilt illusion) were compared for a variety of illusory borders. The more robust the borders, i.e., the more sensitive to changes in orientation, the less their susceptibility to the tilt illusion.
G Westheimer; W Li
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of neurophysiology     Volume:  77     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-05-22     Completed Date:  1997-05-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  731-6     Citation Subset:  IM    
Division of Neurobiology, University of California, Berkeley 94720-3200, USA.
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MeSH Terms
Discrimination (Psychology) / physiology*
Form Perception / physiology*
Orientation / physiology*
Photic Stimulation
Sensory Thresholds / physiology*
Grant Support

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