Fig. 8

Reaction time (RT) and movement time (MT) values and receiver operating characteristic (ROC) curves for control, PD, and MCI subjects. (A,B) RTs and MTs of all control, PD, and MCI subjects. (C,D) ROC curves confirming that RT and MT can effectively separate healthy controls from both people with PD and those with MCI. Dotted diagonal line indicates the expected result if halfwidth did not discriminate between groups. IPD, idiopathic Parkinson’s disease; MCI, mild cognitive impairment. Error bars represent mean ± 1 STD. *P < 0.05; **P < 0.005; ns, not significant.