自発性立位姿勢動揺のフラクタル性に関する考察 : 自己相関のクロスオーバーと遅れフィードバック制御について

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タイトル別名
  • ジハツセイ タチイ シセイ ドウヨウ ノ フラクタルセイ ニ カンスル コウサツ : ジコ ソウカン ノ クロスオーバー ト オクレ フィードバック セイギョ ニ ツイテ
  • ジハツセイ リツイ シセイ ドウヨウ ノ フラクタルセイ ニ カンスル コウサツ ジコ ソウカン ノ クロスオーバー ト オクレ フィールドバック セイギョ ニ ツイテ
  • Fractality of Spontaneous Postural Sway : Crossover of Autocorrelations and Delayed Feedback Control

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type:Departmental Bulletin Paper

Postural control during quiet stance has mainly been studied by assessing the displacement of the center of foot pressure (COP). It has been suggested that descriptive statistics based on the averaging of COP measures over time could conceal the control principles underlying observed postural dynamics and time series analysis would be needed to reveal them. Recently, researchers have used various fractalmethods to study the long-range correlations in COP signals and have reported important results, including (1)the COP fluctuations during quiet stance are fractional Brownian motions (close to 1/f fluctuations); and (2)the transition from persistent to anti-persistent correlations (crossover) occurs in the velocity of spontaneous postural sway, not in the position, which indicates that the control of spontaneous postural sway is velocity-based. This paper focuses on these two observations and reviews the relevant concepts and analytical methods of fractal or self-similar time series to suggest that (1)stabilogram diffusion analysis and detrended fluctuation analysis are valid and reliable to analyze the COP position and velocity data; (2)appropriate interpretations of obtained results require knowledge of the statistical characteristics of fractional Brownian motions and corresponding functional Gaussian noises; and (3)the diffusion coefficient or scaling exponents characterizing the diffusion property and the correlation structure of COP position and velocity data provide information that may lead to understanding the functional state of the postural control system during quiet stance.

identifier:彦根論叢, 第391号, pp. 50-65

identifier:The Hikone Ronso, No.391, pp. 50-65

収録刊行物

  • 彦根論叢

    彦根論叢 第391号 50-65, 2012-03

    滋賀大学経済学会

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