Document Detail

Pupillary response to chromatic flicker.
MedLine Citation:
PMID:  11206288     Owner:  NLM     Status:  MEDLINE    
There is significant evidence for higher-level cortical control of pupillary responses to visual stimuli, suggesting that factors other than luminance changes may induce a pupillary response. In the present study, the pupillary responses to equiluminant flickering stimuli in a range of 3-13 Hz were examined. Flicker stimuli included color-black (luminance-modulated) and color-color (hue-modulated) flicker. Equiluminance was determined both by objective luminance measures as well as by subjective, perceptual equiluminance for each subject. For both objectively and subjectively equiluminant flicker, significant, sustained pupillary constrictions were recorded. The magnitude of these responses was sensitive to both color and frequency parameters; red-blue color-paired flicker consistently produced the strongest constrictions. These responses occurred even when the flicker was of a lower luminance, both physically and perceptually, than a preceding nonflickering color, indicating that chromatic rather than luminance-sensitive mechanisms are involved in this response. Interestingly, the color- and frequency-sensitivity of constriction parallels those of flickers which maximally stimulate photosensitive epileptic patients, raising the possibility that chromatic response may be a factor in photosensitivity.
P Drew; R Sayres; K Watanabe; S Shimojo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  136     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-02-06     Completed Date:  2001-04-12     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  256-62     Citation Subset:  IM    
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MeSH Terms
Color Perception / physiology*
Flicker Fusion / physiology*
Photic Stimulation
Pupil / physiology
Reflex, Pupillary / physiology*
Visual Pathways / physiology

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

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