Table 3.

Questionnaire result from well trained subjects

Question	Grade subject 1	Grade subject 2	Grade subject 3
1. Did you get tired because of the experiment?	3	4	5
2. Did you enjoy the experiment?	8	8	8
3. Did you find the experiment comfortable?	8	8	8
4. Did you feel that you could control voluntarily the movement of the ball?	8	7	7
5. Did you find the sound helpful or disturbing?	8	9	9
6. Did you feel frustration during the experiment?	4	5	5
7. Did you feel frustration during the experiment with only the video feedback?	6	6	7
8. Did you feel frustration during the experiment with the audio feedback?	4	5	5
9. How much likely you will agree to be test subject for this kind of experiment again?	9	9	10