Fig. 3

Halfwidth values and receiver operating characteristic (ROC) curves for control, PD, and MCI subjects. (A) Halfwidth values for every participant in each cohort. The example data shown in Fig. 2 is highlighted here by thicker outline on the individuals’ data point. (B) ROC curves confirming that halfwidth can effectively separate healthy controls from both PD and MCI individuals. 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 < 0.0001; ns, not significant.