Subject demographics and rejected trials and subjects in the analyses comparing PD patients on and off DBS.

<p>Trials were rejected due to the criteria for button press and eye movements (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0173707#pone.0173707.t001" target="_blank">Table 1</a>) that were explained in Methods. Subjects were rejected if more than half of trials in either of their on or off sessions was rejected. In total we rejected 10 subjects; 3 were rejected in both sessions, while the other 7 were rejected in one session (6 in the off-session and 1 in the on-session). MDS-UPDRS score are the mean of 6 patients, because we could not obtain MDP-UPDRS in the on-DBS session.