Neurophysiology analysis of stabilogram by Hurst exponent

Yu. Lyakh, O. Gorshkov, V. Gurjanov, Yu. Vihovanets

Abstract

        The paper deals with the method of fractal analysis applying the al-gorithm of Stabilogram Diffusion Analysis (SDA). The performed research suggest that the posture–control system utilizes open–loop control mecha-nism on a short–term interval and little displacements under postural control. The system allows for the C.O.P. to «drift» with the average period of 2 s. The posture is controlled by the action of feedback mechanisms. The presence of long–term region of negative correlation in stabilograms suggest that the closed –loop control mechanism is utilized on long–term intervals (delay–time > 1 s) and larger displacements.

Keywords: stabilometria, biomedical research, Hurst exponent, Stabilogram diffusion analysis, open-loop control, closed-loop control.