研究盲握旋转时手部动作如何导致角度超调
Motion Analysis of Upper Limb and Hand in a Haptic Rotation Task
- 通过逐步回归分析手部关节运动对旋转任务的影响
- 手腕和手指关节贡献显著，导致90度旋转时超调
- 适合人机交互与触觉反馈系统设计者阅读
人类在盲握旋转旋钮时存在向目标角度超调的倾向。尽管已知部分影响因素，但超调的深层原因仍不明确。本文基于详细运动数据，提出实验框架与分析方法，探究上肢及手部关节运动对触觉旋转任务和角度超调的贡献。通过反向逐步回归分析，研究了双指在不同抓握姿态下完成90度逆时针旋转的任务。结果显示，腕关节、近端指关节的侧向移动以及远端指关节对超调有显著贡献。这表明超调由两种现象引起：1）腕关节的显著作用暗示以手为中心的体感参考系偏差；2）指关节的显著作用表明指尖在旋钮表面滚动，接触点改变而人体未能补偿。
原文摘要 · Abstract (English)
Humans seem to have a bias to overshoot when rotating a rotary knob blindfolded around a specified target angle (i.e. during haptic rotation). Whereas some influence factors that strengthen or weaken such an effect are already known, the underlying reasons for the overshoot are still unknown. This work approaches the topic of haptic rotations by analyzing a detailed recording of the movement. We propose an experimental framework and an approach to investigate which upper limb and hand joint movements contribute significantly to a haptic rotation task and to the angle overshoot based on the acquired data. With stepwise regression with backward elimination, we analyze a rotation around 90 degrees counterclockwise with two fingers under different grasping orientations. Our results showed that the wrist joint, the sideways finger movement in the proximal joints, and the distal finger joints contributed significantly to overshooting. This suggests that two phenomena are behind the overshooting: 1) The significant contribution of the wrist joint indicates a bias of a hand-centered egocentric reference frame. 2) Significant contribution of the finger joints indicates a rolling of the fingertips over the rotary knob surface and, thus, a change of contact point for which probably the human does not compensate.
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