Recurrence quantification analysis of postural fluctuations

A technique (recurrence quantification analysis; RQA) for analyzing center of pressure (COP) signals is presented and applied to data obtained by having participants stand with the head forward or sideways and with eyes open or closed. RQA is suitable for short, nonstationary signals and quantifies...

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Bibliographic Details
Published inGait & posture Vol. 9; no. 1; pp. 65 - 78
Main Authors Riley, M.A, Balasubramaniam, R, Turvey, M.T
Format Journal Article
LanguageEnglish
Published England Elsevier B.V 01.03.1999
Subjects
Adolescent
Adult
Female
Humans
Male
Postural control
Posture - physiology
Pressure
Recurrence plots
Stochastic Processes
Time series analysis
Vision
Vision, Ocular - physiology
Postural control
Time series analysis
Recurrence plots
Vision
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Summary:A technique (recurrence quantification analysis; RQA) for analyzing center of pressure (COP) signals is presented and applied to data obtained by having participants stand with the head forward or sideways and with eyes open or closed. RQA is suitable for short, nonstationary signals and quantifies dynamical (deterministic) structure and nonstationarity. Results indicated that vision affects the deterministic structure (in degree and complexity) of COP motions and that differential optical flow structure (radial versus lamellar flow) induced by spontaneous sway under different head orientations affects COP nonstationarity. Implications of these findings and the sensitivity of RQA to subtle time-evolutionary properties of the COP are discussed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0966-6362
1879-2219
DOI:10.1016/S0966-6362(98)00044-7