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Identification of Adaptation in Human Postural Control using GARCH Models

Johansson, Rolf LU ; Fransson, Per-Anders LU and Magnusson, Måns LU (2001) In Proceedings of the 40th IEEE Conference on Decision and Control, 2001. 1. p.7-12
Abstract
Human postural dynamics was investigated in twelve normal subjects by means of a force platform recording body sway induced by bipolar transmastoid galvanic stimulation of the vestibular nerve and labyrinth. We modeled the stabilizing forces actuated by the feet as resulting from complex muscular activity subject to feedback of body velocity and position. Time series analysis demonstrated that a transfer function from stimulus to sway-force response with specific parameters could be identified. In addition, adaptation to the vestibular stimulus was demonstrated to exist. Residual GARCH modeling (generalized autoregressive conditional heteroskedasticity) suggested a postural adaptation time constant in the range of 40-50 s. The results... (More)
Human postural dynamics was investigated in twelve normal subjects by means of a force platform recording body sway induced by bipolar transmastoid galvanic stimulation of the vestibular nerve and labyrinth. We modeled the stabilizing forces actuated by the feet as resulting from complex muscular activity subject to feedback of body velocity and position. Time series analysis demonstrated that a transfer function from stimulus to sway-force response with specific parameters could be identified. In addition, adaptation to the vestibular stimulus was demonstrated to exist. Residual GARCH modeling (generalized autoregressive conditional heteroskedasticity) suggested a postural adaptation time constant in the range of 40-50 s. The results suggest means to evaluate adaptive behavior in postural control and in other physiological contexts (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
transfer function, time series analysis, stabilizing forces, labyrinth, human postural control, generalized autoregressive conditional heteroskedasticity, feedback, force platform, complex muscular activity, body sway, bipolar transmastoid galvanic stimulation, adaptation identification, GARCH models, vestibular nerve, adaptive control
in
Proceedings of the 40th IEEE Conference on Decision and Control, 2001.
volume
1
pages
7 - 12
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • Scopus:0035706015
ISBN
0-7803-7061-9
DOI
10.1109/.2001.980059
language
English
LU publication?
yes
id
74fd32f3-d240-4187-abc2-8997b1e365bc (old id 537897)
date added to LUP
2007-09-20 16:29:22
date last changed
2017-01-01 07:56:17
@inproceedings{74fd32f3-d240-4187-abc2-8997b1e365bc,
  abstract     = {Human postural dynamics was investigated in twelve normal subjects by means of a force platform recording body sway induced by bipolar transmastoid galvanic stimulation of the vestibular nerve and labyrinth. We modeled the stabilizing forces actuated by the feet as resulting from complex muscular activity subject to feedback of body velocity and position. Time series analysis demonstrated that a transfer function from stimulus to sway-force response with specific parameters could be identified. In addition, adaptation to the vestibular stimulus was demonstrated to exist. Residual GARCH modeling (generalized autoregressive conditional heteroskedasticity) suggested a postural adaptation time constant in the range of 40-50 s. The results suggest means to evaluate adaptive behavior in postural control and in other physiological contexts},
  author       = {Johansson, Rolf and Fransson, Per-Anders and Magnusson, Måns},
  booktitle    = {Proceedings of the 40th IEEE Conference on Decision and Control, 2001.},
  isbn         = {0-7803-7061-9},
  keyword      = {transfer function,time series analysis,stabilizing forces,labyrinth,human postural control,generalized autoregressive conditional heteroskedasticity,feedback,force platform,complex muscular activity,body sway,bipolar transmastoid galvanic stimulation,adaptation identification,GARCH models,vestibular nerve,adaptive control},
  language     = {eng},
  pages        = {7--12},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  title        = {Identification of Adaptation in Human Postural Control using GARCH Models},
  url          = {http://dx.doi.org/10.1109/.2001.980059},
  volume       = {1},
  year         = {2001},
}