Table 2.
EEfRT task performances of schizotypy and control groups.
| Variables of Interest | Schizotypy (N = 40) | Controls (N = 40) | χ2/t | p | High-AMO (N = 20) | Low-AMO (N = 20) | χ2/F | p |
|---|---|---|---|---|---|---|---|---|
| Basic EEfRT performance | ||||||||
| Trials | 63.95 (10.20) | 63.80 (9.47) | 0.02 | 0.982 | 64.45 (9.84) | 63.25 (10.78) | 0.07 | 0.929 |
| Hard trial (%) | 40.69 (20.56) | 40.59 (20.57) | 0.02 | 0.984 | 38.27 (22.17) | 43.10 (19.08) | 0.27 | 0.761 |
| Reaction time | 1.27 (0.41) | 1.43 (0.44) | −1.65 | 0.103 | 1.18 (0.37) | 1.37 (0.43) | 2.35 | 0.102 |
| Completed trial | 62.00 (10.35) | 61.58 (9.61) | 0.19 | 0.850 | 61.60 (9.56) | 62.40 (11.32) | 0.50 | 0.952 |
| Selected EEfRT performance indices | ||||||||
| 88% probability | 0.61 (0.26) | 0.66 (0.26) | −0.84 | 0.401 | 0.57 (0.27) | 0.65 (0.25) | 0.91 | 0.405 |
| Large reward | 0.55 (0.25) | 0.56 (0.26) | −0.20 | 0.984 | 0.49 (0.27) | 0.62 (0.23) | 1.51 | 0.227 |
| 88% probability with large reward | 0.78 (0.30) | 0.85 (0.27) | −1.08 | 0.283 | 0.68 (0.32) | 0.87 (0.25) | 2.88 | 0.062 |
| Probability difference score | 0.42 (0.28) | 0.49 (0.27) | −1.20 | 0.233 | 0.34 (0.30) | 0.49 (0.24) | 2.29 | 0.108 |
| Reward difference score | 0.36 (0.25) | 0.36 (0.21) | −0.04 | 0.972 | 0.26 (0.24) | 0.45 (0.23) | 3.29 | 0.042a |
| Probability/reward difference score | 0.67 (0.39) | 0.76 (0.32) | −1.16 | 0.249 | 0.53 (0.43) | 0.81 (0.29) | 4.09 | 0.020b |
AMO, Amotivation; EEfRT, Effort Expenditure for Reward Task. aPost-hoc contrast tests showed that High-AMO group had significantly lower reward difference score than Low-AMO group (p = 0.032) only. bPost-hoc contrast tests showed that High-AMO group had significantly lower probability/reward difference score than Low-AMO (p = 0.040) and control. (p = 0.030) groups. The latter two groups did not significantly differ from each other on probability/reward difference score.