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Phosphenes Elicited by Subcortical Stimulation in Man Takaomi TAIRA 1,2 , Edward Hitchcock 1 1Department of Neurosurgery, University of Birmingham Keyword: Phosphene , Subcortical stimulation , Vision pp.1025-1031
Published Date 1991/11/10
DOI https://doi.org/10.11477/mf.1436900348
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Abstract

Electrical stimulation of a point in the visual pathway can evoke a visual sensation which is called a phos-phene. The phosphenes elicited by intracerebral sti-mulation were investigated in twenty-three subjects. One hundred and seven phosphenes were reported and all of them appeared in the visual field contralateral to the side of stimulation. The exception was a single case where a diffuse flashing sensation appeared in the whole visual field. Thirteen patients reported white phosphenes and nine patients reported coloured phos-phenes. In the medial area (10 - 15mm from the midline) of the occipital lobe, stimuli above the calca-rine fissure resulted in phosphenes in the lower quad-rant of the visual field. In the lateral area (16 - 32mm from the midline) , however, stimuli above the level of the calcarine fissure tended to produce phosphenes in the upper quadrant. These findings appear to conflict with traditional concept of the physiological anatomy of the visual pathway in man. The possible mechanism of this phenomenon produced by intracerebral stimula-tion is discussed in ralation to the phosphenes produced by cortical stimulation.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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