Fig. 2

Setup of the game-based intervention. The avatar can be controlled by joint movements (e.g., elbow flexion as in the upper picture) or by muscle activations (right M. rectus femoris as in picture at the bottom). Involuntary movements (e.g., shoulder abduction) or muscle activations (left M. rectus femoris) trigger the feedback signal to make the player aware of their occurrence and to reduce them