Williams Matthew R, Kirsch Robert F
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
IEEE Trans Neural Syst Rehabil Eng. 2008 Oct;16(5):485-96. doi: 10.1109/TNSRE.2008.2006216.
We investigated the performance of three user interfaces for restoration of cursor control in individuals with tetraplegia: head orientation, electromyography (EMG) from face and neck muscles, and a standard computer mouse (for comparison). Subjects engaged in a 2-D, center-out, Fitts' Law style task and performance was evaluated using several measures. Overall, head orientation commanded motion resembled mouse commanded cursor motion (smooth, accurate movements to all targets), although with somewhat lower performance. EMG commanded movements exhibited a higher average speed, but other performance measures were lower, particularly for diagonal targets. Compared to head orientation, EMG as a cursor command source was less accurate, was more affected by target direction and was more prone to overshoot the target. In particular, EMG commands for diagonal targets were more sequential, moving first in one direction and then the other rather than moving simultaneous in the two directions. While the relative performance of each user interface differs, each has specific advantages depending on the application.
头部定向、面部和颈部肌肉的肌电图（EMG）以及标准计算机鼠标（用于比较）。受试者参与了一项二维、从中心向外的、符合菲茨定律风格的任务，并使用多种测量方法评估了性能。总体而言，头部定向控制的运动类似于鼠标控制的光标运动（向所有目标进行平滑、精确的移动），尽管性能略低。肌电图控制的运动平均速度较高，但其他性能指标较低，尤其是对角目标。与头部定向相比，肌电图作为光标命令源的准确性较低，受目标方向的影响更大，更容易越过目标。特别是，对角目标的肌电图命令更具顺序性，先向一个方向移动，然后再向另一个方向移动，而不是同时在两个方向上移动。虽然每个用户界面的相对性能有所不同，但每个界面都有特定的优势，具体取决于应用场景。
