Table 2 Scores (mean ± std) for the questionnaire items regarding paper-and-pencil and both iVR-based far and near space tasks. Scores range from 1 (‘completely disagree’) to 7 (‘completely agree’)

Fatigue, relaxation and focus

 1. [Before the task:] Do you feel tired?

3.1 ± 1.9

2.7 ± 1.8

2.5 ± 1.7

 2. [Before the task:] Do you feel relaxed?

5.7 ± 1.5

6.1 ± 1.2

5.8 ± 1.5

1b. [After the task:] Do you feel tired?

2.7 ± 1.9

3.7 ± 2.0

2.8 ± 1.7

2b. [After the task:] Do you feel relaxed?

6.4 ± 0.9

5.5 ± 1.8

5.4 ± 1.4

 3. Were you focused on the task?

6.7 ± 0.6

6.8 ± 0.5

6.8 ± 0.4

Accuracy of motion tracking system

 4. When you were in the starting position on the blue circle, did the position of the virtual hand correspond with that of your own hand?

6.0 ± 1.0

 5. When you attained the target, did the position of the virtual hand correspond with that of your own hand?

6.1 ± 1.0

 6. Were the movements of the virtual arm synchronized with the movements of your own arm?

5.4 ± 1.6

Presence, body ownership and sense of agency

 7. During the task, did you have the feeling to be in the virtual environment?

6.4 ± 1.3

6.1 ± 1.2

 8. Did you have the feeling that the virtual arm was your own arm?

4.5 ± 2.0

 9. Did you have the feeling of controlling the movements of the virtual arm?

6.3 ± 0.8

Comfort

 10. Did the task make you feel physical discomfort?

1.0 ± 0.2

2.2 ± 1.7

1.6 ± 1.2

 11. Did the task make you dizzy?

1.8 ± 1.5

2.5 ± 2.0

Task design

 12. Was it difficult to perform the task?

1.6 ± 1.1

2.8 ± 1.8

2.3 ± 2.1

 13. Did you have the time to attain the targets?

6.6 ± 0.8

6.9 ± 0.2

 14. Did you feel like you could attain the targets in the space?

6.4 ± 0.6

6.9 ± 0.3

 15. [If dual task] Was the secondary task (the sound test) distracting?

3.2 ± 2.0

1.9 ± 1.4

 16. [If dual task] Was it difficult to achieve both tasks?

3.4 ± 1.7

2.2 ± 1.4

Enjoyment & preference

 17. Was the task enjoyable?

6.1 ± 1.2

5.7 ± 1.3

4.6 ± 1.6

 18. Was the task boring?

1.4 ± 1.1

2.7 ± 1.7

3.3 ± 2.0

 19. Which task did you prefer?

7

29

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