Extended reality (XR) technologies are highly suited in assisting individuals in learning motor skills and movements -- referred to as motion guidance. In motion guidance, the "feedforward" provides instructional cues of the motions that are to be performed, whereas the "feedback" provides cues which help correct mistakes and minimize errors. Designing synergistic feedforward and feedback is vital to providing an effective learning experience, but this interplay between the two has not yet been adequately explored. Based on a survey of the literature, we propose design space for both motion feedforward and corrective feedback in XR, and describe the interaction effects between them. We identify common design approaches of XR-based motion guidance found in our literature corpus, and discuss them through the lens of our design dimensions. We then discuss additional contextual factors and considerations that influence this design, together with future research opportunities for motion guidance in XR.

翻译：扩展现实（XR）技术在辅助个体学习运动技能与动作（即运动引导）方面具有高度适用性。在运动引导中，“前馈”提供待执行动作的教学提示，而“反馈”则提供有助于纠正错误和减少失误的提示。设计协同的前馈与反馈机制对于提供高效学习体验至关重要，但两者间的相互作用尚未得到充分探索。基于文献调研，我们提出了XR中运动前馈与纠错反馈的设计空间，并阐述了两者之间的交互效应。通过梳理文献库中基于XR的运动引导常见设计方法，我们基于设计维度对这些方法进行了分析讨论。进而探讨了影响该设计的其他情境因素与考量，以及XR运动引导领域的未来研究机遇。