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Failure of Arm Movement Control in Stroke Patients, Characterized by Loss of Complexity

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  • Segun Goh
  • Kyungreem Han
  • Jehkwang Ryu
  • Seonjin Kim
  • MooYoung Choi

Abstract

We study the mechanism of human arm-posture control by means of nonlinear dynamics and quantitative time series analysis methods. Utilizing linear and nonlinear measures in combination, we find that pathological tremors emerge in patient dynamics and serve as a main feature discriminating between normal and patient groups. The deterministic structure accompanied with loss of complexity inherent in the tremor dynamics is also revealed. To probe the underlying mechanism of the arm-posture dynamics, we further analyze the coupling patterns between joints and components, and discuss their roles in breaking of the organization structure. As a result, we elucidate the mechanisms in the arm-posture dynamics of normal subjects responding to the gravitational force and for the reduction of the dynamic degrees of freedom in the patient dynamics. This study provides an integrated framework for the origin of the loss of complexity in the dynamics of patients as well as the coupling structure in the arm-posture dynamics.

Suggested Citation

  • Segun Goh & Kyungreem Han & Jehkwang Ryu & Seonjin Kim & MooYoung Choi, 2015. "Failure of Arm Movement Control in Stroke Patients, Characterized by Loss of Complexity," PLOS ONE, Public Library of Science, vol. 10(11), pages 1-17, November.
    • Handle: RePEc:plo:pone00:0141996
    DOI: 10.1371/journal.pone.0141996
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    References listed on IDEAS

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