Radwin R G, Vanderheiden G C, Lin M L
Department of Industrial Engineering, University of Wisconsin, Madison 53706.
Hum Factors. 1990 Aug;32(4):423-38. doi: 10.1177/001872089003200405.
The discrete movement task employed in this study consisted of moving a cursor from the center of a computer display screen to circular targets located 24.4 and 110.9 mm in eight radial directions. The target diameters were 2.7, 8.1, and 24.2 mm. Performance measures included movement time, cursor path distance, and root-mean-square cursor deviation. Ten subjects with no movement disabilities were studied using a conventional mouse and a lightweight ultrasonic head-controlled computer input pointing device. Average movement time was 306 ms greater (63%) for the head-controlled pointer than for the mouse. The effect of direction on movement time for the mouse was relatively small compared with the head-controlled pointer, which was lowest at 90 and 270 deg, corresponding to head extension and head flexion, respectively. Average path distance and root mean square displacement was lowest at off-diagonal directions (0, 90, 180, and 270 deg). This methodology was also shown to be useful for evaluating performance using an alternative head-controlled input device for two subjects having cerebral palsy, and measured subtle performance improvements after providing a disabled subject with lateral torso support.
本研究中采用的离散运动任务包括将光标从计算机显示屏中心移动到位于八个径向方向、距离分别为24.4毫米和110.9毫米的圆形目标上。目标直径分别为2.7毫米、8.1毫米和24.2毫米。性能指标包括移动时间、光标路径距离和光标均方根偏差。使用传统鼠标和轻便的超声头部控制计算机输入指针设备对10名无运动障碍的受试者进行了研究。与鼠标相比，头部控制指针的平均移动时间长306毫秒（63%）。与头部控制指针相比，方向对鼠标移动时间的影响相对较小，头部控制指针在90度和270度时移动时间最短，分别对应头部伸展和头部弯曲。平均路径距离和均方位移在非对角线方向（0度、90度、180度和270度）最短。该方法还被证明对于评估两名患有脑瘫的受试者使用另一种头部控制输入设备的性能很有用，并且在为一名残疾受试者提供侧向躯干支撑后，测量到了细微的性能改善。
