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Figure 4 | Journal of NeuroEngineering and Rehabilitation

Figure 4

From: Exploring the bases for a mixed reality stroke rehabilitation system, Part II: Design of Interactive Feedback for upper limb rehabilitation

Figure 4

Example of trajectory evaluation for feedback generation. x'(t) is the horizontal hand trajectory (measured in cm) along the X' direction. X ref is the trajectory reference, from an average across non-impaired subject trajectories. The dead zone is the bandwidth for non-impaired subject variation. Trajectory deviation Δx' within this zone is zero. Feedback on trajectory deviation increases or decreases exponentially as the hand moves farther away from the dead zone toward the right or left. The rate of change in trajectory deviation is controlled by the adjustable size of the hull. The wider the hull, the slower the rate of deviation change, resulting in a less sensitive feedback bandwidth. Size of the hull is adjusted by the clinician depending upon the needs of the participant.

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