Multi-stimulus multi-response posturography.
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.
Johansson
R
R
Department of Automatic Control, Lund Institute of Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden. rolf.johansson@control.lth.se
Magnusson
M
M
Fransson
P A
PA
Karlberg
M
M
D000293:Adolescent; D000328:Adult; D000465:Algorithms; D001696:Biomechanical Phenomena; D005246:Feedback; D005260:Female; D006801:Humans; D008297:Male; D008433:Mathematics; D008875:Middle Aged; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology