一側迷路障害例における身体の自覚的垂直位の偏位 Tilted Perception of Subjective Orientation Following Unilateral Vestibular Lesion

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著者

    • 伊藤 八次 ITO Yatsuji
    • 岐阜大学医学部耳鼻咽喉科学教室 Department of Otorhinolaryngology, Gifu University School of Medicine
    • 宮田 英雄 MIYATA Hideo
    • 岐阜大学医学部耳鼻咽喉科学教室 Department of Otorhinolaryngology, Gifu University School of Medicine
    • BURCHILL Peter
    • 国立神経内科・脳外科病院 Medical Research Council, Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery
    • GRESTY Michael
    • 国立神経内科・脳外科病院 Medical Research Council, Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery

抄録

Acute unilateral loss of vestibular function (UVL) may cause ocular cyclotorsion, skew deviation, head tilt and leaning of the trunk toward the lesioned side. This response (in part) may result from asymmetry of the vestibulo-ocular and vestibulo-spinal reflexes but could be thought of as a realignment of the body with a tilted perception of the subjective postural vertical (SPV) due to vestibular asymmetry. Subjective perception of static uprightness is normal in UVL, probably because proprioception can readily be used for tilt estimation. Accordingly, we examined SPV when proprioceptive cues were changing rapidly. Subjects were challenged to fly a simulator earth level against discrete imposed roll tilts of 10°-28°. They flew in calm conditions and when perturbed by roll oscillations at 1 Hz, 5° peak simulating turbulence. Normal subjects achieved a mean level flight attitude of 0.5° right SD 0.7° when calm and 0.6° right SD 1.3° when turbulent. Patients with unilateral vestibular nerve section flew tilted slightly to the side of their lesion, mean 2.6° SD 2.1° when calm, p < 0.05, and during turbulence by a mean 7.4° SD 2.6°, p < 0.01. We conclude that vestibular signals are used more to determine SPV when proprioception changes rapidly and that the lateralized tilt observed in UVL patients suggests that a unilateral vestibular lesion, probably of the otolith, causes a bias of the SPV.

収録刊行物

  • Equilibrium research

    Equilibrium research 57(1), 54-59, 1998-02-01

    Japan Society for Equilibrium Research

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各種コード

  • NII論文ID(NAID)
    10008710673
  • 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  J-STAGE 
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