Comparative analysis of the dynamics of human postural control during fixation and pursuit of a visual target |
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Authors: | E. V. Bobrova V. I. Kucher Yu. S. Levik I. N. Bogacheva |
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Affiliation: | (1) Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, 199034, Russia;(2) Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 101447, Russia |
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Abstract: | The properties of the system maintaining the upright posture were compared in different states of the oculomotor system: during target fixation and horizontal fast and slow pursuit (0.1 and 0.01 Hz), recording the trajectories of the center of pressure in the frontal and the sagittal planes. Methods of nonlinear analysis were applied to assess the similarity in pairwise comparisons. The overall similarity of the frontal plane dynamics proved to be higher than that of the sagittal plane dynamics. However, differences were revealed in fast pursuit versus slow pursuit or fixation in the frontal but not in the sagittal plane. Such differences may reflect the different inertia of the oculomotor and the balance control systems. In general, the results are consistent with the current notions on the two orthogonal subsystems of postural control. |
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Keywords: | upright posture balance control dynamic similarity nonlinear analysis smooth pursuit |
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