自覚的垂直位と前庭機能異常 : 身体動揺の研究・第40報

概要

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Patients with peripheral disorders may experience abnormal vertical sensations while standing, which cause disorientation in their environment. A disturbance of vestibular function in the light is reflected by postural instability in space. The present study investigates the relationship between subjective vertical displacement and vestibular lesions. The subjects were patients with a unilateral vestibular lesion; control subjects had no past or present history of a vestibular lesion. A straight line consisting of 5 spotlights projected on a dome-shaped screen was concentrically moved like a stylus when a button was pressed. We examined the subjective vertical of the subjects standing in a dark room when the 5-spotlights-straight-line (the spotlight-line) was projected on the dome-shaped screen.<BR>Patients with a unilateral peripheral disorder showed a significantly greater deviation to the impaired ear side, especially when the spotlight-line was moved from the impaired side, while the deviation of the normal subjects was less than 1 deg.