Document Detail

Synesthetically induced colors evoke apparent-motion perception.
MedLine Citation:
PMID:  17286123     Owner:  NLM     Status:  MEDLINE    
Synesthesia is a condition in which certain otherwise normal individuals see colors when they hear tones, or, when they look at black-and-white numbers, each number is tinged with a specific color (eg 5 is red and 2 is green). We constructed a display in which a random matrix of 5s had a vertical column of 2s 'embedded' in it. This was shown in frame 1 of a movie, followed by a similar display in frame 2 in which the element locations were uncorrelated but the bar as a whole was shifted horizontally. When normal subjects viewed the display, they just saw random jitter or twinkle; there was no impression of a bar moving horizontally. But, when our subject (JC) who had grapheme-color synesthesia viewed the display, he reported seeing a bar moving left or right depending on the trial. We conclude that, in at least some subjects, a synesthetically induced color that does not exist on the retina can nonetheless influence motion perception.
Vilayanur S Ramachandran; Shai Azoulai
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception     Volume:  35     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2006  
Date Detail:
Created Date:  2007-02-08     Completed Date:  2007-07-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  1557-60     Citation Subset:  IM    
Center for Brain and Cognition, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0109, USA.
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MeSH Terms
Case-Control Studies
Color Perception / physiology*
Motion Perception / physiology*
Optical Illusions*
Perceptual Disorders / psychology*
Sensory Thresholds / physiology

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