Table 2.
Mean and standard deviation (brackets) scores for the six NASA TLX Scales (mental demand, physical demand, temporal demand, frustration, effort and perception of performance) and the DSSQ motivation scale.
| Demand | Low | High | Excessive | |||
|---|---|---|---|---|---|---|
| Incentive | Inc. | No inc. | Inc. | No inc. | Inc. | No inc. |
| Mental demand | 3.77 (2.29) | 3.00 (2.17) | 6.50 (1.87) | 5.32 (2.03) | 7.73 (1.95) | 7.00 (2.77) |
| Physical demand | 3.00 (2.25) | 2.09 (1.51) | 5.50 (2.8) | 4.05 (2.58) | 6.73 (2.79) | 7.00 (2.77) |
| Temporal demand | 2.00 (0.87) | 1.95 (1.48) | 6.09 (1.45) | 6.00 (1.8) | 9.27 (1.13) | 8.72 (1.92) |
| Frustration | 4.18 (2.58) | 3.95 (2.42) | 4.18 (2.33) | 4.36 (2.53) | 8.18 (2.02) | 7.64 (2.4) |
| Effort | 4.41 (2.4) | 2.95 (1.93) | 7.23 (1.78) | 5.68 (2.24) | 8.41 (1.53) | 6.77 (2.61) |
| Perception of performance | 7.27 (2.54) | 7.55 (2.05) | 7.14 (2.41) | 5.73 (2.64) | 1.50 (0.99) | 2.23 (1.78) |
| Motivation | 6.14 (0.91) | 4.86 (1.88) | 7.60 (1.04) | 6.20 (1.38) | 5.73 (1.68) | 5.40 (1.31) |
Inc., incentive; No inc., no incentive; N = 20.