Table 1 Questionnaire data: NASA-TLX (means and standard deviations)

Mental demand

12.52 (5.69)

12.88 (6.37)

14.70 (5.95)

15.45 (5.43)

Temporal demand

11.88 (6.20)

12.20 (5.42)

16.75 (3.92)

18.10 (2.45)

Performance

5.12 (4.29)

6.44 (4.58)

8.95 (5.49)

10.90 (5.03)

Effort

12.20 (4.83)

10.64 (6.09)

13.85 (4.11)

15.25 (4.29)

Frustration

6.12 (3.99)

6.76 (5.27)

12.00 (4.35)

12.95 (5.12)