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PENDULAR ROTATION TEST: APPARATUS AND NOR MAL RESPONSES Kimihisa Nomura 1 pp.455-464
Published Date 1972/7/20
DOI https://doi.org/10.11477/mf.1492207795
  • Abstract
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 The authors constructed a pendular rotation apparatus in which torsion of steel wire is used as the source of energy. It was first created by Greiner (France). The duration of the rotation is 20 seconds and the initial position is placed 180° away from its equilibrium point. The result of 37 normal persons between the ages of 20 and 49 tested with this apparatus is as follows:

 The number of nystagmuses in the half-period of rotation were counted 13 to 19 at 18°/sec2 of the maximum angular acceleration (the initial turn) and 9 to 15 at 9°/sec2 (at the middle of the test). The amplitude of the nystagmus was 5°to 11°at18°/sec2, and, 3°to 7°at 9°/sec2. In the older subjects there was a tendency for the nystagmus numbers to be increased while the amplitude to become decreased.

 The threshold of nystagmus response in most cases ranged from 1°to 2°/sec2 and rarely above the latter figure. The directional preponderance in the nystagmus numbers was within 20% in 30 cases, the average ranged 10.2% ±8.7%.

 The rythm of nystagmus was regular in most cases, but slight temporary inhibitions or salves (short hurts of tachynystagmus) were noted in few cases. No pathological habituation is found in repeated examinations at interval of 1 to 2 minutes. In some cases mental arithmetic performed by the subject showed improvement in the nystagmus re-sponse.


Copyright © 1972, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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