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Topological disorder in peripheral vision

Published online by Cambridge University Press:  02 June 2009

Robert F. Hess  and
Jim McCarthy
Robert F. Hess
Affiliation:
McGill Vision Research Unit, Department of OphthalmologyMcGill University, Montreal, Quebec, Canada
Jim McCarthy
Affiliation:
McGill Vision Research Unit, Department of OphthalmologyMcGill University, Montreal, Quebec, Canada
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Abstract

One of the most striking properties of the mammalian visual system is that it is only the central part of the visual field, the fovea, where vision is most acute. The superiority of the fovea is particularly evident in tasks requiring accurate spatial localization. It is currently thought that peripheral spatial uncertainty is a simple consequence of the decreased sampling grain of the peripheral field. We show that the topological fidelity of the afferent projection declines with eccentricity away from the fovea and that it is this rather than the sampling grain that underlies the poorer performance of the periphery in tasks involving spatial localization. The combination of normal sampling and a disordered topology results in the periphery having good sensitivity for detection but poor sensitivity for object recognition.

Keywords

Neural mappingTopologyPeripheral field

Information

Type
Short Communications
Information
Visual Neuroscience , Volume 11 , Issue 5 , September 1994 , pp. 1033 - 1036
Copyright
Copyright © Cambridge University Press 1994

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