Results of the stop signal task for patients with Parkinson’s disease (PD) and orthopaedic controls (OC)
| Group | |||||||
|---|---|---|---|---|---|---|---|
| PD | OC | ||||||
| Mean | SD | Mean | SD | t (df = 61) | Effect size (d) | p | |
| RT, reaction time; SSRT, stop signal reaction time; SD, standard deviation; df, degrees of freedom. | |||||||
| RT (practice block) | 595 | 84 | 545 | 55 | 2.81 | 0.70 | 0.007 |
| Probability of responding | 48.1 | 3.6 | 47.1 | 2.9 | 1.26 | 0.31 | 0.2 |
| Errors % | 8.1 | 9.8 | 3.9 | 5.2 | 2.11 | 0.53 | 0.04 |
| RT in trials without stop signal | 769 | 189 | 767 | 217 | 0.04 | 0.01 | 0.97 |
| Signal respond RT (ms) | 675 | 142 | 675 | 184 | −0.01 | 0.00 | 0.99 |
| SSRT (ms) | 330 | 63 | 259 | 58 | 4.63 | 1.17 | 0.0001 |