EEG was concurrently acquired with Ag/AgCl electrodes placed, in accordance with the international 10–20 system of placement, at FP1, FP2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5, T6, Fz, Cz, and Pz. All electrodes were referenced to linked earlobes. Electrode impedance was held below 5 kOhm. EEG data were recorded through a 0.53–120 Hz band-pass filter with a sampling rate of 500 Hz. We used the EEG in order to confirm P300 activities.
