Document Detail

Chromatic and achromatic vision of macaques: role of the P pathway.
MedLine Citation:
PMID:  2926482     Owner:  NLM     Status:  MEDLINE    
Chromatic and achromatic contrast sensitivity were measured in a human observer, 2 normal macaque monkeys, and 3 monkeys with severe toxicant-induced damage to the parvocellular projecting retinogeniculate pathway (P cell-deficient monkeys). Damage to the P pathway was produced by the oral administration of acrylamide monomer (Eskin and Merigan, 1986). Contrast sensitivity was measured in all subjects with isochromatic luminance gratings, as well as isoluminant chromatic gratings, modulated along several directions of a color space that represents color-opponent and luminance contrast (Krauskopf et al., 1986). The chromatic and achromatic sensitivity of the control monkeys was virtually identical to that of the human observer. Chromatic sensitivity of the P cell-deficient monkeys, measured at a low spatial frequency (0.3 c/deg), along a constant-blue color axis, was 0.9-1.5 log units lower than that of controls. Similar losses were seen along a tritanopic confusion axis and along 2 intermediate axes of color direction. Chromatic thresholds measured at higher spatial frequency (2.0 c/deg) were similarly reduced. Counterphase-modulated chromatic gratings were used to test color sensitivity over a range of temporal frequencies up to 15 Hz, and the loss of color vision was substantial over the entire range of frequencies. The luminance contrast sensitivity of the P cell-deficient monkeys for stationary gratings decreased after exposure by 0.5-0.8 log units. These results indicate that the chromatic and achromatic spatial vision of macaques is very similar to that of humans. They also suggest that the P pathway plays an important role in macaque chromatic sensitivity at all spatial frequencies, as well as achromatic sensitivity at high spatial and lower temporal frequencies.
W H Merigan
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  9     ISSN:  0270-6474     ISO Abbreviation:  J. Neurosci.     Publication Date:  1989 Mar 
Date Detail:
Created Date:  1989-05-05     Completed Date:  1989-05-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  776-83     Citation Subset:  IM    
Department of Ophthalmology, University of Rochester Medical Center, New York 14642.
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MeSH Terms
Acrylamides / pharmacology
Color Perception / physiology*
Contrast Sensitivity / drug effects
Geniculate Bodies / physiology
Macaca / physiology*
Macaca nemestrina / physiology*
Retina / physiology
Sensory Thresholds
Vision, Ocular / physiology*
Visual Pathways / drug effects,  pathology,  physiology*
Grant Support
Reg. No./Substance:
0/Acrylamides; 79-06-1/Acrylamide

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