Identification of human postural control

M. L. Corradini, S. Fioretti, T. Leo, R. Piperno, M. Franceschini, S. Stecchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Black box modelling and identification was applied to the motor-sensory feedback of a posture control system without external disturbances. The standing upright subject was modelled using an inverted-pendulum model. Analysis was extended to 28 healthy subjects engaged in cognitive verbal and visuo-spatial tasks. Further, 3 pathological subjects were examined, who were suffering from multiple sclerosis. The transfer function of the whole closed loop system was then considered, and the relative poles were computed. The distribution of the above poles on the z-plane showed an overall stabilizing effect of the cognitive tasks, both for healthy and pathological subjects, if compared to stance with open and closed eyes. Between the two tasks, the visuo-spatial one was found to be more stabilizing than the verbal one. On the other hand, differences on the model order of the controller were found among the tested pathological and healthy people. In fact, the order remained unchanged both interindividually for healthy subjects performing the same task, both among different tasks performed by the same subject. Instead, pathological subjects were found to be characterized by a different model order, with respect to the healthy population, for the controller block of the posture control system.

Original languageEnglish
Title of host publicationIFAC Symposia Series - Proceedings of a Triennial World Congress
EditorsU. Jaaksoo, V.I. Utkin
PublisherPubl by Pergamon Press Inc
Pages255-261
Number of pages7
Volume2
Publication statusPublished - 1991
EventProceedings of the 11th Triennial World Congress of the International Federation of Automatic Control - Tallinn, USSR
Duration: Aug 13 1990Aug 17 1990

Other

OtherProceedings of the 11th Triennial World Congress of the International Federation of Automatic Control
CityTallinn, USSR
Period8/13/908/17/90

ASJC Scopus subject areas

  • Engineering(all)

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