Design Space of Visual Feedforward And Corrective Feedback in XR-Based Motion Guidance Systems

Figure 1: Schematic representations of motion feedforward. The leftmost column shows the complete motion sequence and its critical postures at four critical moments (Start, Point1, Point2, and End). The remaining columns show how the feedforward of this motion can be represented using different configurations of level of indirection (explicit, implicit and abstract) and interactive update strategy (discrete, continuous and autonomous). The visualizations in blue represent the feedforward; while the the black glyphs show the trainee's four moments during training from top to bottom (Start, reach Point 1, between Point 1 and Point 2, and between Point 2 and End); the green parts visualize the completed parts of a motion when using Implicit guidance (column 4 and 5). Discrete guidance (column 2, 4 and 6) presents cues for the next critical posture, which updates only when that posture is satisfied. Continuous guidance (column 3, 5 and 7) presents cues for the next frame in the motion sequence at all times. Autonomous guidance is not shown as it operates independently of the trainee's actions.