Table 3

Results of the stop signal task for patients with Parkinson’s disease (PD) and orthopaedic controls (OC)

Group
PDOC
MeanSDMeanSDt (df = 61)Effect size (d)p
RT, reaction time; SSRT, stop signal reaction time; SD, standard deviation; df, degrees of freedom.
RT (practice block)59584545552.810.700.007
Probability of responding48.13.647.12.91.260.310.2
Errors %8.19.83.95.22.110.530.04
RT in trials without stop signal7691897672170.040.010.97
Signal respond RT (ms)675142675184−0.010.000.99
SSRT (ms)33063259584.631.170.0001