脑瘫患者目标习得任务中等距操纵杆和位置操纵杆的评价。

R S Rao, R Seliktar, T Rahman
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引用次数: 64

摘要

患有上肢残疾的脑瘫(CP)患者在操作鼠标和键盘等标准计算机输入设备方面存在困难。本研究评估了未受损个体和CP患者在与计算机交互时使用零阶弹簧中心位置操纵杆和零阶等距操纵杆的表现。我们假设,等距装置,由于其刚性阻力,将提供更好的控制光标移动比位置操纵杆。受试者通过在目标上放置光标,在不同距离上获取不同大小的目标。位置操纵杆的性能优于等距操纵杆。被试获得目标的时间与光标与目标的距离A成正比,与目标的大小w成间接正比。被试对较小较近的目标选择慢速移动,对较大较远的目标选择快速移动。在光标位移上绘制光标速度剖面值的相平面图显示,光标的峰值速度存在一个大振幅运动,以及几个子运动。Fitts难度指数log(e)(2W/A)可以很好地预测光标定位任务中未受损个体和CP患者的运动时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of an isometric and a position joystick in a target acquisition task for individuals with cerebral palsy.

Individuals with cerebral palsy (CP) with upper limb disability have difficulty operating standard computer input devices such as, a mouse and a keyboard. The present study evaluated the performance of unimpaired individuals and those with CP in the use of a zero-order spring-centered position joystick and a zero-order isometric joystick when interacting with the computer. We hypothesize that the isometric device due to its stiff resistance would provide better control on cursor movement than the position joystick. The subjects acquired differently sized targets at different distances by positioning a cursor on the target. Performance with the position joystick was superior to that of the isometric joystick. The time to acquire the target was directly proportional to the cursor-target distance A, and indirectly proportional to the target size W. Subjects chose to move more slowly toward the smaller and closer targets and they increased speed for larger and more distant targets. The phase-plane diagram that plots values of the velocity profile of the cursor over its displacement revealed the presence of one large amplitude movement that accounts for the peak velocity of the cursor, and several submovements. Fitts' index of difficulty, log(e)(2W/A) was found to be a good predictor of the movement time in a cursor positioning task for both, unimpaired individuals and those with CP.

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