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Math Biosci. 2001 Nov;174(1):41-59.

Multi-stimulus multi-response posturography.

Author information

1
Department of Automatic Control, Lund Institute of Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden. rolf.johansson@control.lth.se

Abstract

In this study a method for the analysis of simultaneous multiple measurements of kinematics and stabilizing forces related to human postural dynamics is proposed. Each subject in a group of normal subjects (n=10) was tested with eyes-open and eyes-closed with simultaneous but uncorrelated vestibular and proprioceptive stimuli in order to investigate the contributions of individual sensory feedback loops. Statistical analysis was made by means of multi-input multi-output identification of a transfer function from stimuli to stabilizing forces of the feet and the resulting body position, the transfer function being compatible with a biomechanical model formulated as a stabilized segmented inverted pendulum subject to feedback of body sway and position. Each individual model estimated is effective in predicting a subject's response to new stimuli and in describing the interacting effects of stimuli on body kinetics. The proposed methodology responds to the current needs of data analysis of multi-stimulus multi-response experiments.

PMID:
11595256
[Indexed for MEDLINE]

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