Table 1.

Key elements of a depth camera–based, task-specific virtual reality rehabilitation game [37].

Component	Key elements
Device	OpenNI–compliant depth sensor, stable system
Design	Goal-oriented task-specific contents; interactive and interesting elements; and easy-to-understand tutorials to show explanation, evaluation, and training and increase motivation for rehabilitation
Difficulty level	Easy to know how to interact, adjustable to match individualized performance
Scoring	Scoring system to record and compare performance status
Sound	Sound showing feedback of the performance, exaggerated effects sounds to improve motivation