Table 5.

Average grades per question (naïve subjects)

Question	Average grade (naïve subjects)
1. Did you get tired because of the experiment?	5.86
2. Did you enjoy the experiment?	7.43
3. Did you find the experiment comfortable?	7.00
4. Did you feel that you could control voluntarily the movement of the ball?	4.86
5. Did you find the sound helpful or disturbing?	5.43
6. Did you feel frustration during the experiment?	6.14
7. Did you feel frustration during the experiment with only the video feedback?	6.43
8. Did you feel frustration during the experiment with the audio feedback?	4.43
9. How much likely you will agree to be test subject for this kind of experiment again?	9.28