Hooke Alexander W, Karol Sohit, Park Jaebum, Kim Yoon Hyuk, Shim Jae Kun
Department of Kinesiology, University of Maryland, College Park, MD, Italy.
Motor Control. 2012 Jul;16(3):329-52. doi: 10.1123/mcj.16.3.329. Epub 2012 May 24.
The purpose of this study was to investigate central nervous system (CNS) strategies for controlling multifinger forces during a circle-drawing task. Subjects drew 30 concentric, discontinuous clockwise and counter clockwise circles, at self and experimenter-set paces. The three-dimensional trajectory of the pen's center of mass and the three-dimensional forces and moments of force at each contact between the hand and the pen were recorded. Uncontrolled Manifold Analysis was used to quantify the synergies between pen-hand contact forces in radial, tangential and vertical directions. Results showed that synergies in the radial and tangential components were significantly stronger than in the vertical component. Synergies in the clockwise direction were significantly stronger than the counterclockwise direction in the radial and vertical components. Pace was found to be insignificant under any condition.
本研究的目的是调查在画圆任务中控制多指力量的中枢神经系统（CNS）策略。受试者以自己设定和实验者设定的速度绘制30个同心、不连续的顺时针和逆时针圆圈。记录笔质心的三维轨迹以及手与笔每次接触时的三维力和力矩。使用非受控流形分析来量化笔与手在径向、切向和垂直方向接触力之间的协同作用。结果表明，径向和切向分量的协同作用明显强于垂直分量。在径向和垂直分量中，顺时针方向的协同作用明显强于逆时针方向。发现在任何条件下速度都无关紧要。
