NDLI: Nonstationarities of postural sway

Content Provider	IEEE Xplore Digital Library
Author	Loughlin, P.J. Redfern, M.S. Furman, J.M.
Copyright Year	1983
Abstract	Time-frequency analysis of visually induced postural sway has uncovered potentially important time-dependent spectral changes in sway, particularly over intervals shorter than most trial lengths (tens of seconds). Specifically, our studies of center of pressure (COP) in response to sinusoidal (0.25 Hz) moving scene perturbations demonstrate that there are significant population-dependent time-varying changes in response to such visual perturbations, manifest in the instantaneous power at the stimulus frequency, and in low-order conditional moments of the time-varying spectral density of sway (the conditional mean frequency and bandwidth, also called the instantaneous frequency and the instantaneous bandwidth). In particular, adaptation, as quantified by a decrease in the instantaneous power of sway over time at the stimulus frequency, was observed in the control and elderly subjects but not in the vestibularly impaired group. We believe that these quantities are important measures for studying time-variations in postural sway and that continued application of nonstationary analysis methods such as time-frequency analysis is necessary to better understand and model time-varying aspects of balance.
Page Count	7
File Size	444223
Starting Page	69
Ending Page	75
File Format	PDF
ISSN	07395175
Volume Number	22
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-03-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectrogram Time frequency analysis Filter bank Band pass filters Nonlinear filters Spectral analysis Signal analysis Frequency estimation Humans Yield estimation
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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