Effect of visually induced self-motion perception (vection) on upright standing posture

ICHIKAWA, Masumi; WATANABE, Satoru; 市川, 真澄; 渡邉, 悟

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Effect of visually induced self-motion perception (vection) on upright standing posture

http://hdl.handle.net/2237/16690

	名前 / ファイル	ライセンス	アクション
	o4315.pdf (1.7 MB)

Item type

学位論文 / Thesis or Dissertation(1)

公開日

2012-08-02

タイトル

Effect of visually induced self-motion perception (vection) on upright standing posture

著者

ICHIKAWA, Masumi

WATANABE, Satoru

市川, 真澄

渡邉, 悟

キーワード

主題Scheme

Other

主題

Upright standing posture

キーワード

主題Scheme

Other

主題

Optokinetic stimulation

キーワード

主題Scheme

Other

主題

Pitch Vection

キーワード

主題Scheme

Other

主題

Readjustment of posture

抄録

内容記述

This study examined the relationship between the magnitude of vection (visually induced perception of self-motion) and the forward body tilt induced by optokinetic stimulation (OKS). Twelve healthy adult subjects participated in this study. A moving random dot pattern as an OKS was projected on a large hemispherica1 dome screen placed in front of the subject. The pattern was moved downward on the screen. Each subject stood on a force-measuring platform in Romberg's position and gazed at a red fixation point in the center of the screen. OKS velocity in a range of 10 to 100 deg/sec was presented in random order. The magnitude of pitch vection caused by OKS was measured by the ten-point assessment method. The body sway values registered by the force-measuring platform were stored on a data recorder. After the antero-posterior component of body sway was converted by 12 bit A/D converter, a maximum point and average level of forward displacement of center of gravity caused by OKS was calculated by computer. Power spectrum analysis was applied for anterio-posterior body sway by the FFT method. From these analyses it was concluded that there was a close relationship between the magnitude of vection and the forward displacement of center of gravity caused by OKS. This suggests that the vection induced by moving patterns strongly modifies readjustment of the upright standing posture. 直立姿勢を維持した被験者に対して､視野の広い部分に動くパターン(視運動刺激､optokinetic stimulation)を呈示すると､パターンの移動方向へ自己の身体の運動感覚(vection) を知覚すると同時に､パターンの移動方向への身体傾斜が誘発される｡本研究においては､直径150cmの半球状スクリーンの内側を､上方から下方へと移動するランダムドットパターンを被験者に呈示する事により､知覚されるvectionの大きさと､誘発される直立姿勢の傾斜の大きさとの関係について検討することを目的とした｡12名の健康な被験者が実験に参加した｡被験者らは､暗室内においてRomberg姿勢でforce platform上に直立し､前方に置かれた半球スクリ-ン中央の､赤色レーザースポットによる固視点を注視した｡視運動刺激速度は､10deg/secから100deg/secまでの範囲について､10deg/sec毎の角速度を､無作為な順序で60秒間呈示した｡Vectionの大きさは10点表示法を用いて定量化し､口述により測定終了直後に報告させた｡視運動刺激中の直立姿勢変化は､前後方向の重心動揺軌跡をA/D変換し､視連動刺激中における重心の前方移動量を計測し換討した｡また､FFT法により重心動揺軌跡の周波数解析を行った｡視運動刺激中においては､直立姿勢の前傾と､一定刺激速度時における前傾維持姿勢が観察された(直立姿勢の再調節)。視運動刺激によって誘発されたvectionの大きさと重心の最大前方移動量との間には密接な関係が認められた｡これは､視連動刺激によって誘発される直立姿勢の再調節の大きさは､vectionの知覚の大きさに依存することを示唆する｡

内容記述タイプ

Abstract

内容記述

名古屋大学博士学位論文学位の種類 : 博士(医学)(論文) 学位授与年月日:平成4年12月22日市川真澄氏の博士論文として提出された

内容記述タイプ

Other

出版者

日本宇宙航空環境医学会

言語

eng

資源タイプ

資源

http://purl.org/coar/resource_type/c_46ec

タイプ

thesis

ISSN

収録物識別子タイプ

ISSN

収録物識別子

0387-0723

書誌情報

Japanese journal of aerospace and environmental medicine

巻 29, 号 4, p. 107-116, 発行日 1992-12

学位授与年度

1992

学位授与年月日

1992-12-01

学位授与番号

13901乙第4315号

著者版フラグ

値

publisher

URI

識別子

http://hdl.handle.net/2237/16690

識別子タイプ

HDL

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Effect of visually induced self-motion perception (vection) on upright standing posture

× ICHIKAWA, Masumi

× WATANABE, Satoru

× 市川, 真澄

× 渡邉, 悟

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