Circle-drawing movements at different speeds: role of inertial anisotropy.
Circle-drawing movements at different speeds: role of inertial anisotropy.
复制标题
不同速度的画圆运动：惯性各向异性的作用。
DOI：
10.1152/jn.00946.2001
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Hasan,Ziaul
中科院分区：
文献类型：
--
作者：
Pfann,KerstinD;Corcos,DanielM;Moore,CharityG;Hasan,Ziaul
这项研究调查的作用，惯性各向异性的手在造成扭曲的运动。受试者在工作区的四个位置以三个指示的速度使用肘部和肩部运动在水平面上画圆。具体而言，我们测试了两个假设，如果CNS在产生画圆运动时没有完全考虑惯性的各向异性，我们会预期这两个假设：1）速度将影响图形的圆形度，更快的运动与更大的椭圆形伸长相关，而不管前臂和上臂之间具有类似角度的配置的工作空间位置如何。2）快速旋转时圆的伸长将在惯性最小的方向上。结果表明，尽管手肘和肩部的相对运动的速度依赖性的个体差异，圆度降低（失真增加）随着速度的增加，和工作空间的位置对圆度没有影响。我们还发现，在快速的圆的伸长是在一个方向接近，但显着不同的方向的最小惯性的三个工作空间位置，是在方向上的最小惯性的第四个位置。我们认为，伸长率的结果缺乏充分的会计由CNS的各向异性的粘度和惯性。
This study investigated the role of inertial anisotropy at the hand in causing distortions in movement. Subjects drew circles in the horizontal plane at four locations in the workspace at three instructed paces using elbow and shoulder movements. Specifically, we tested two hypotheses, which we would expect if the anisotropy of inertia were not completely accounted for by the CNS when generating circle-drawing movements:1) speed will affect the circularity of figures, with faster movements associated with greater elongation into an oval shape, irrespective of workspace location for configurations with a similar angle between the forearm and upper arm.2) The elongation of the circle at fast speeds will be in the direction of least inertia. The results showed that despite individual differences in the speed dependence of the relative motions at the elbow and the shoulder, the circularity decreased (distortion increased) with increased speed, and workspace location had no effect on circularity. We also found that the elongation of the circles at fast speeds was in a direction close to but significantly different from the direction of least inertia for three workspace locations and was in the direction of least inertia for the fourth location. We suggest that the elongation results from lack of full accounting by the CNS of the anisotropy of viscosity and inertia.