Document Detail

Color filling-in under steady fixation: behavioral demonstration in monkeys and humans.
MedLine Citation:
PMID:  10755147     Owner:  NLM     Status:  MEDLINE    
Color filling-in is a phenomenon in which the color of an object appears to be filled-in by the color of the surrounding field. We have studied the question of whether monkeys perceive color filling-in with near-foveal stimuli under steady fixation. Two monkeys were trained to fixate steadily and to attend to a disk, surrounded by an annulus of the complementary color, in parafoveal vision. Using displays in which the color of the disk was gradually changed to that of the annulus, we trained the animals to signal when they perceived a uniform color field. During the experiment, we introduced a small percentage of trials in which the disk color remained constant, and looked for 'filling-in' responses in these trials. Three human subjects were also tested for comparison. All subjects produced 'filling-in' responses with frequencies that were significantly higher for static disks with blurred borders than for moving disks or disks with sharp borders. This indicates that the monkeys' responses reflected perceptual filling-in, rather than random behavior. The time course of filling-in was similar in monkeys and humans. For the blurred static disks, responses occurred first after 3-4 s of fixation, reaching a probability of 0.2-0.8 by the end of 6 s, depending on the subject.
H S Friedman; H Zhou; R von der Heydt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Perception     Volume:  28     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  1999  
Date Detail:
Created Date:  2000-05-04     Completed Date:  2000-05-04     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1383-95     Citation Subset:  IM    
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MeSH Terms
Behavior, Animal
Color Perception / physiology*
Fixation, Ocular / physiology*
Macaca mulatta / physiology*
Photic Stimulation / methods
Reaction Time
Time Factors
Grant Support
EY02966/EY/NEI NIH HHS; R01 EY002966/EY/NEI NIH HHS; R01 EY002966-20/EY/NEI NIH HHS

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