書誌事項
- タイトル別名
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- Time Constant of Forward Body Sway Induced by Downward Optokinetic Stimulus.
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Forward body sway induced by a downward optokinetic stimulus (OKS) was observed in 38 healthy subjects. The downward OKS was generated by a moving random dot pattern projected onto a half-pipe screen 2 m in diameter and was provided by a rectangular-like step function with velocities of 10, 20, 30 and 40 deg/sec. A fixation target was set by a red laser spot projected onto the screen in front of the subjects. As an additional stimulatory condition, 20 deg/sec of OKS with no fixation target was employed. The induced forward body sway was measured by a force-detecting platform as displacement of the center of gravity (COG). The gradual forward shift of COG followed by the plateau state was closely akin to a graphical representation of an equation of the first order lag time. As OKS velocities increased, the plateau level increased. Curve fitting analysis using a computer was employed to establish an approximation equation of the first order lag time. This analysis showed that the time constant of the optokinetic spinal response system was approximately 15 sec and the value of the time constant was independent of OKS velocity. Based on this long time constant, we concluded that the postural readjustment induced by OKS mainly plays a role in the low frequency range of human postural control.
収録刊行物
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- Equilibrium Research
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Equilibrium Research 58 (1), 48-55, 1999
一般社団法人 日本めまい平衡医学会
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詳細情報 詳細情報について
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- CRID
- 1390001204948142976
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- NII論文ID
- 10008712557
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- NII書誌ID
- AN00001485
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- COI
- 1:STN:280:DC%2BD3Mnmt1SjtA%3D%3D
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- ISSN
- 1882577X
- 03855716
- http://id.crossref.org/issn/03855716
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- PubMed
- 11543419
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可