Abstract
Adaptation to displacement of objects in the visual field was studied as a function of preexposure test targets being absent or present in that field and lateral arm movement requiring no pointing at targets being observed or unobservable during prism exposure. Significantly greater adaptation was found when targets present during prism exposure were the same as those present during pre and postexposure test conditions. In addition, greater adaptation was found when S was permitted observation of lateral arm movement during prism exposure. Greatest adaptation was produced when both targets were present and arm movement was observable during prism exposure. In addition, when three targets were present during prism exposure, the greatest amount of adaptation was found for targets on S’s prismatically shifted visual field periphery.
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