In virtual reality (VR) applications, hand-controller interaction is largely limited by the biomechanical structure of the arm and its kinematical features. Earlier research revealed that different arm postures generate distinct arm fatigue levels in mid-air operational tasks; however, how they impact interaction performance, e.g., accuracy of target grasp and manipulation, has been less investigated. To fill this gap in knowledge, we conducted an empirical experiment in which thirty participants were recruited to complete a series of target acquisition tasks in a specifically designed VR application. Results show that (1) a bent arm posture resulted in a higher interaction accuracy than a stretched arm posture; (2) a downward arm posture interacted more accurately than an upraised arm posture; since two arms are bilaterally symmetric, (3) either selected arm interacted more accurately on the corresponding side than on the opposite side; and (4) the user-preferred or dominant arm interacted more persistently than the non-dominant one, though two arms generated little difference in interaction accuracy. Implications and suggestions are discussed for designing more efficient and user-satisfying interactive spaces in VR.

中文翻译：

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手臂姿势变化及其对虚拟现实中手控制器交互评估的影响

在虚拟现实 (VR) 应用中，手控制器交互在很大程度上受到手臂的生物力学结构及其运动学特征的限制。早期的研究表明，在空中作战任务中，不同的手臂姿势会产生不同的手臂疲劳程度；然而，它们如何影响交互性能，例如目标抓取和操作的准确性，却很少被研究。为了填补这一知识空白，我们进行了一项实证实验，招募了 30 名参与者，在专门设计的 VR 应用程序中完成一系列目标获取任务。结果表明：（1）弯曲的手臂姿势比伸展的手臂姿势产生更高的交互精度；(2) 向下的手臂姿势比向上的手臂姿势更准确地相互作用；因为两个臂是双边对称的，(3) 任一选定的手臂在对应侧的相互作用比在对侧更准确；(4) 用户偏好或主导的手臂比非主导手臂的交互更持久，尽管两个手臂在交互准确性上产生的差异很小。讨论了在 VR 中设计更高效和用户满意的交互空间的意义和建议。