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INFLUENCE ON EEGS OF GAZING AT A FIXATION POINT AND OF GANZFELD Takeo Takahashi 1 1Department of Neuropsychiatry, Tohoku University School of Medicine pp.95-103
Published Date 1976/1/1
DOI https://doi.org/10.11477/mf.1406203833
  • Abstract
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Influence on EEGs of gazing at a fixation pointand of Ganzfeld was studied in a total of 77 sub-jects; they were 5 normal adults, 66 epileptics and6 patients with various neuropsychiatric disorders.Of these 77 subjects, 16 showed normal awakeEEG and 61 abnormal awake EEG.

A white thick paper (18 cm by 26 cm) was placed20 cm before the eyes of a subject, and he wasmade to gaze at a black spot of 4 mm diametermarked at the center of this paper. This was con-tinued for 10 seconds. Then he was covered by awhite thin paper (30 cm by 34 cm) simultaneouslytaking off that paper marked a black spot, andhis eyes were kept open for 30 seconds (Ganzfeld).The brightness of both papers was kept at 40 cd/mm2.He was not allowed to blink during theseexaminations.

The EEG changes by gazing at a fixation pointand by Ganzfeld were divided into the followingtwo: (1) desynchronization by the former andsynchronization by the latter, and (2) no significantchanges by both. The first group included alphaactivity (16 cases), posterior slow activity (12 cases),diffuse slow activity (3 cases), generalized par-oxysmal discharges (23 cases), and focal paroxysmaldischarges over the posterior cerebral regions (10cases). The second group included only focal par-oxysmal discharges over the anterior cerebral regions(13 cases).

It was suggested that the results obtained abovemight be explained by the following: ocular fixa-tion by gazing at a fixation point and visual stimu-lus of Ganzfeld act at the posterior cerebral regions,where the visual cortex is located; they also actat the centrencephalon either directly or indirectlyvia the visual cortex, but may not act at theanterior cerebral regions.


Copyright © 1976, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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