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Visual aftereffects and the consequences of visual system lesions on their perception in the rhesus monkey

Published online by Cambridge University Press:  02 June 2009

Peter H. Schiller  and
Robert P. Dolan
Peter H. Schiller
Affiliation:
Massachusetts Institute of Technology, Cambridge
Robert P. Dolan
Affiliation:
Massachusetts Institute of Technology, Cambridge
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Abstract

This study examined the consequences of visual system lesions on visual aftereffects produced by achromatic stimuli of various luminance contrasts and chromatic stimuli of various wavelength compositions. The effects of repeated exposure to such adapting stimuli were assessed using probes whose luminance contrast and wavelength composition were systematically varied using both detection and discrimination paradigms. Interocular tests revealed that both peripheral and central mechanisms contribute to the visual aftereffects produced by the adapting stimulus arrays used in this study. Contrary to the hypothesis according to which the midget system of the retina is the conveyor of visual afterimages, we found that blocking this system with lesions of parvocellular lateral geniculate nucleus, through which the midget cells make their way to the striate cortex in primates, did not eliminate the visual aftereffects. It appears therefore that the parasol system of the retina, which courses through the magnocellular layers of the lateral geniculate nucleus to cortex, can convey the necessary signals for the generation of visual aftereffects. Lesions of areas V4 and MT did not have significant effects on the visual aftereffects studied suggesting that the central factors that contribute to the visual aftereffects occur either already in area VI or are conveyed to higher centers through regions other than areas V4 and MT.

Keywords

Visual systemVisual aftereffectsAfterimagesParallel pathwaysExtrastriate cortex

Information

Type
Research Articles
Information
Visual Neuroscience , Volume 11 , Issue 4 , July 1994 , pp. 643 - 665
Copyright
Copyright © Cambridge University Press 1994

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