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Visual effects of damage to P ganglion cells in macaques

Published online by Cambridge University Press:  02 June 2009

James J. Lynch,
Luiz C. L. Silveira,
V. Hugh Perry and
William H. Merigan
James J. Lynch
Affiliation:
Department of Biophysics, University of Rochester Medical Center, Rochester
Luiz C. L. Silveira
Affiliation:
Departmento de Fisiologia, Centro de Ciencias Biologicas, Universidade Federal do Para, 66059 Belem, Para, Brasil
V. Hugh Perry
Affiliation:
Department of Experimental Psychology, University of Oxford, Oxford, U.K.
William H. Merigan
Affiliation:
Department of Ophthalmology and Center for Visual Science, University of Rochester Medical Center, Rochester
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Abstract

Four indices of visual performance were measured in control macaques and in macaques that had been exposed to monomeric acrylamide, a neurotoxicant that preferentially damages P retinal ganglion cells. Morphological examination of the retina and visual pathways of these monkeys showed virtually complete loss of P ganglion cells over a region extending to at least 40 deg from the fovea, and relative sparing of M ganglion cells. The four tests examined visual functions for which the visual pathway from P ganglion cells might be of great importance: visual acuity, contrast discrimination, hyperacuity, and shape discrimination.

In the acrylamide-dosed monkeys, visual acuity was reduced slightly more than fourfold, a somewhat larger reduction than that seen previously after ibotenic-acid lesions of the P pathway in the geniculate. The residual acuity was in good agreement with the Nyquist frequency calculated from the density of ON or OFF M ganglion cells. Contrast increment thresholds were elevated for the dosed monkeys only in one of the two conditions tested. The elevation was found only under those spatiotemporal conditions for which we have previously shown that contrast thresholds are increased by acrylamide exposure, and was most marked at low background contrasts. Vernier acuity was elevated in one dosed monkey, but not affected in a second monkey that also had severe loss of P ganglion cells. Finally, we found no effect of acrylamide exposure on the number of training trials required to learn simple or complex shape discriminations. These results support previous findings in showing that the P pathway mediates visual acuity, and they show that several other important aspects of visual perception are not exclusively dependent on the P pathway.

Keywords

Parallel pathwaysSampling densityMacaque monkey acuityShape discrimination

Information

Type
Research Articles
Information
Visual Neuroscience , Volume 8 , Issue 6 , June 1992, pp. 575 - 583
Copyright
Copyright © Cambridge University Press 1992

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