Table 5.
Mean reaction times and t-test results for the reward-based learning tasks in healthy controls (NC) and PD patients on levodopa (ON) and off levodopa (OFF).
| Group characteristics | t-test for equality of means | ||||||
|---|---|---|---|---|---|---|---|
| N | Mean | SD | t | df | Sig. (two-tailed) | ||
| INSTRUMENTAL LEARNING TASK | |||||||
| NC | 14 | 586.6 | 75.9 | NC vs. ON | −1.953 | 27 | 0.061 |
| PD ON | 15 | 516.4 | 112.7 | NC vs. OFF | −1.225 | 27 | 0.231 |
| PD OFF | 15 | 545.8 | 100.7 | ON vs. OFF | 1.031 | 14 | 0.320 |
| REVERSAL LEARNING TASK | |||||||
| NC | 15 | 512.9 | 72.2 | NC vs. ON | −1.085 | 27 | 0.287 |
| PD ON | 14 | 479.0 | 95.6 | NC vs. OFF | −0.419 | 27 | 0.679 |
| PD OFF | 14 | 500.3 | 89.6 | ON vs. OFF | 0.945 | 13 | 0.362 |