EEG was recorded for 4 min as the participants were sitting on a comfortable chair and were instructed to stay awake with their eyes closed and not to move. Participants sat in a dimly lit, sound-attenuated RF-shielded booth (Industrial Acoustics, Inc., Bronx, NY, USA) with 64-channel electrode cap (Electro-Cap International, Inc., Eaton, OH, USA) based on the extended 10–20 System. EEG recording and preprocessing procedures are described in Supplementary Materials.
