Phase resetting of uni-and bi-manual rhythmic arm movements due to perturbationстатья

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1. Полный текст 2005_phase_ressetting.pdf 141,4 КБ 7 сентября 2016 [UstinovaK]

[1] Levin M., Ustinova K., Feldman A. Phase resetting of uni-and bi-manual rhythmic arm movements due to perturbation // Gait and Posture. — 2005. — Vol. 21, no. S1. — P. 68–68. Introduction: Rhythmical arm movements may be produced in a pendulum-like manner by central destabilization of the system at one equilibrium position. Alternatively, they may result from transitions between two equilibrium positions that define the spatial boundaries of movement. Methods: Standing subjects swung one or both arms from the shoulder joints, in-phase at -0.8 Hz. In randomly selected cycles, one arm was transiently arrested by an electromagnetic device while the arm was moving forward or backward. Results: When perturbed, the oscillations of the arm or arms were reset around the extreme forward or backward arm position. This was especially evident in the case of bi-manual movements when the non-perturbed arm stopped moving at this position. When oscillations were renewed, the phase shifted randomly with respect to the preperturbation period. Such phase resetting occurred in both uni- and bimanual movements, regardless of when or which arm was perturbed. Conclusion: Results support the hypothesis that the central nervous system produces transitions between two stable equilibrium positions of the arm(s), rather than elicits pendulum-like oscillations about a single position. The frequency and spatial boundaries of arm oscillations may be controlled by changing the rate of transitions and by adjusting the equilibrium positions, respectively. In response to perturbations, the generator may arrive at one of the equilibrium states and resume oscillations at a new phase, as observed in the present study. Our findings are relevant to locomotion and suggest that walking may also be generated by transitions between several equilibrium states of the body. [ DOI ]

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