Steady-state and perturbed rhythmical movements: a dynamical analysis.
Steady-state and perturbed rhythmical movements: a dynamical analysis.
复制标题
DOI：
10.1037//0096-1523.17.1.183
复制
发表时间：
1991-02
期刊：
影响因子：
--
通讯作者：
B. Kay;E. Saltzman;J. Kelso
中科院分区：
文献类型：
--
作者：
B. Kay;E. Saltzman;J. Kelso
这项研究考察了手指在稳定状态和短暂扰动状态下的有节奏的运动，以得出它们的定性动力学特性。在扰动下，运动频率、幅度和峰值速度是稳定的，这表明吸引子的存在，并且该吸引子的拓扑维大约等于1。随着运动频率的增加，吸引子的强度是恒定的，稳态试验的傅里叶谱显示出交替的谐波模式。这些结果与以前导出的非线性振子模型是一致的。然而，振荡在整体上被微扰提前，并且出现了一致的相变相移模式，这与模型不一致。总的相位推进也表明，任何负责产生节律的中央模式发生器都必须由被控制的肢体进行非平凡的调制。
This study examined rhythmic finger movements in the steady state and when momentarily perturbed in order to derive their qualitative dynamical properties. Movement frequency, amplitude, and peak velocity were stable under perturbation, signaling the presence of an attractor, and the topological dimensionality of that attractor was approximately equal to one. The strength of the attractor was constant with increasing movement frequency, and the Fourier spectra of the steady-state trials showed an alternating harmonic pattern. These results are consistent with a previously derived nonlinear oscillator model. However, the oscillation was phase advanced by perturbation overall, and a consistent phase-dependent, phase-shift pattern occurred, which is inconsistent with the model. The overall phase advance also shows that any central pattern generator responsible for generating the rhythm must be nontrivially modulated by the limb being controlled.