The Effect of Central Nervous System Diseases on the Predictive Control Function for Time Delay

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Abstract

This paper is concerned with a role of the central nervous system in the predictive motor control function. To evaluate such a human operator's function effectively, his compensation characteristics for time delay in the compensatory manual control system with a random step input have been obtained. The effect of two central nervous system diseases, Parkinsonism and cerebellar ataxia, on the predictive control function is discussed throug'h operators’ frequency responses, coherency functions, and so on. Futhermore, the hypothesis that the human predictive control behavior is produced by means of the process model in the motor coordination system is examined in comparison with data obtained from the patient and normal subject groups. The following results have been obtained. (1) Patients with Parkinsonism or cerebellar ataxia have functional disorders of predictive control. (2) The closed-loop systems controlled by patients with cerebellar ataxia have a relatively wide bandwidth but they are fairly oscillatory and have the nonlinearity similar to the systems controlled by patients with Parkinsonism. (3) An impediment in the predictive control function of the patient with cerebellar ataxia may be caused by the malfunction of the process model in the cerebellar cortex to predict the future state of the neuro-muscular system or the controlled object.

Original languageEnglish
Pages (from-to)172-179
Number of pages8
Journaljapanese journal of medical electronics and biological engineering
Volume23
Issue number3
DOIs
Publication statusPublished - 1985 Jan 1

ASJC Scopus subject areas

  • Biomedical Engineering

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