Document Detail

Within-species variations in visual capacity among squirrel monkeys (Saimiri sciureus): sensitivity differences.
MedLine Citation:
PMID:  6868399     Owner:  NLM     Status:  MEDLINE    
Earlier observations suggested there might be significant within-species variations in visual sensitivity among squirrel monkeys (Saimiri sciureus). Reported here are the results from measurements of increment-threshold spectral sensitivity in 41 squirrel monkeys of Peruvian origin. As determined in a forced-choice discrimination task, no large variations were found among these animals in sensitivity to a 540 nm test light. However, there were large individual variations in sensitivity to a 640 nm light, the result being that, across this sample of monkeys, the differences in sensitivity to the 540 and 640 nm lights are bimodally distributed. This variation in sensitivity is gender related in that the more sensitive mode in this distribution is made up exclusively of female monkeys. The less sensitive animals include all of the males tested and a minority (7 out of 22) of the females examined. Additional experiments involving the measurement of sensitivity to monochromatic lights under conditions of dark and chromatic adaptation indicate that (a) the variation in sensitivity is not due to the variable presence of an intraretinal filter, and (b) the more sensitive squirrel monkeys have two differentially adaptable spectral mechanisms in the green to red portion of the spectrum, while the less sensitive monkeys do not.
G H Jacobs
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  23     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1983  
Date Detail:
Created Date:  1983-08-11     Completed Date:  1983-08-11     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  239-48     Citation Subset:  IM; S    
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MeSH Terms
Cebidae / physiology*
Color Perception / physiology
Dark Adaptation
Saimiri / physiology*
Sensory Thresholds / physiology
Sex Factors
Visual Perception / physiology*
Grant Support

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

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