The EEG system used was the actiCHamp (Brain Products, Gilching, Germany), with a
total of 64 channels. All electrodes were applied using SignaGel electrode gel. During the data collection, electrode impedances were kept below 5 kΩ. The signal was recorded in reference to channel Cz, and a ground electrode was located on the forehead. To facilitate artifact detection,ocular movements were recorded with electrodes placed on the outer canthi of the left and right eyes which were used to derive horizontal electrooculogram (HEOG). Vertical electrooculogram (VEOG) was derived as the average of the Fp1 and Fp2 electrodes