いわゆる Transitory alternating saccades の波形分析 Quantitative Analysis of Transitory Alternating Saccadic Abnormal Eye Movements

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Although transitory alternating saccade (TAS) is classically-observed as one of the cerebellar ocular-motor signs, its occurrence has been noted only in isolated cases in the literature. In the present study, we quantitatively examined a total of 29 TAS waveforms with spectral analysis by discrete Fourier transformation. TAS was characterized by periodic eye movements over a time course of several seconds coupled with fast eye movement that reverses its direction. That is, the low frequency component of TAS was a periodic eye drift with a frequency of 0.36±0.09 Hz and an amplitude of 11.4±4.4°, whereas the high frequency component was a nystagmus-like eye movement with an amplitude of 1.41±0.4°. Routine computerized electronystagmography (ENG) testing revealed that in only 3 cases TAS was observed during the testing of spontaneous nystagmus. In another 26 cases, TAS was evoked during head position-change, neck stimulation such as neck-torsion and carotid-compression, or after optokinetic and rotational stimulation. In 48% of the 29 cases, disorders in visual fixation, smooth pursuit, and optokinetic nystagmus were also seen. TAS may be a result of the pathological oculomotor findings associated with lesions in the vicinity of the midline of the cerebellum.

収録刊行物

  • Equilibrium research

    Equilibrium research 66(2), 59-63, 2007-04-01

    Japan Society for Equilibrium Research

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各種コード

  • NII論文ID(NAID)
    10021290114
  • NII書誌ID(NCID)
    AN00001485
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03855716
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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