Document Detail

Hidden visual processes.
MedLine Citation:
PMID:  6836258     Owner:  NLM     Status:  MEDLINE    
Isoluminant stimulus is an image whose edges are defined only by a change in color, not by change in brightness. The stimulus here is imperfect: the blue parts and the green parts of the image are only as nearly equal in brightness as they can be on the printed page. Moreover, the change in brightness beyond the edge of the page is apparent, and so is the fact that the reader is holding the magazine at reading distance. When such cues are removed under laboratory conditions, subjects faced with an isoluminant stimulus prove unable to bring its edges into focus. This deficiency contributes to making a familiar face hard to recognize. The experiment indicates that the brain process underlying visual accommodation (the focusing of the eyes) cannot "see" color; it is a hidden process distinct from the processes that lead to perception. The image shows Groucho Marx as he appeared in the motion picture Horse Feathers.
J M Wolfe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Scientific American     Volume:  248     ISSN:  0036-8733     ISO Abbreviation:  Sci. Am.     Publication Date:  1983 Feb 
Date Detail:
Created Date:  1983-05-05     Completed Date:  1983-05-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0404400     Medline TA:  Sci Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  94-103     Citation Subset:  IM; S    
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MeSH Terms
Color Perception / physiology*
Motion Perception / physiology
Ocular Physiological Phenomena
Vision, Ocular
Visual Perception / physiology*

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

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