Massachusetts Institute of Technology, 77 Massachusetts, Ave office 3-137, Cambridge, MA 02139, USA.
Exp Brain Res. 2010 May;202(4):733-46. doi: 10.1007/s00221-010-2176-8. Epub 2010 Feb 19.
We tested 23 healthy participants who performed rhythmic horizontal movements of the elbow. The required amplitude and frequency ranges of the movements were specified to the participants using a closed shape on a phase-plane display, showing angular velocity versus angular position, such that participants had to continuously control both the speed and the displacement of their forearm. We found that the combined accuracy in velocity and position throughout the movement was not a monotonic function of movement speed. Our findings suggest that specific combinations of required movement frequency and amplitude give rise to two distinct types of movements: one of a more rhythmic nature, and the other of a more discrete nature.
我们测试了 23 名健康参与者，让他们进行肘部的有节奏的水平运动。参与者使用相平面显示器上的闭合形状来指定运动的所需幅度和频率范围，该形状显示角速度与角位置，以便参与者必须持续控制前臂的速度和位移。我们发现，整个运动过程中速度和位置的综合精度不是运动速度的单调函数。我们的研究结果表明，所需运动频率和幅度的特定组合会产生两种不同类型的运动：一种更有节奏，另一种更离散。
