Eye-tracking procedure
The experiment took place in a sound-attenuated, darkened and electrically shielded room which the researcher monitoring the progress in the adjoining room. All participants were seated in an upright armchair with back support at distance of 70 cm from a computer monitor with a diagonal of 60 cm and with their head stabilized with chin and forehead rests.An infrared video-based eye-tracker (EyeLink 1000 Plus, SR Research, Ontario, Canada) recorded positions of both eyes at a sampling rate of 500 Hz and an instrumental spatial resolution of 0.01° with simultaneous recording of EEG data. The eye-tracker was calibrated and validated with a 9-point grid before each experimental block. The validation was repeated until average errors for all points were < 1° compared to the result of the calibration. Moreover, to ensure precision within blocks, a drift correction prior to each trial was performed.The experiment was programmed in MATLAB 2020b (The Mathworks Inc., Massachusetts, USA) using the psychophysics toolbox (Each trial started with a red central fixation cue (diameter 1° visual angle) that was presented for 1000 ms in the middle of a black screen. It was followed by the appearance of a white lateral target stimulus located either 10° left or right from the initial fixation cue (The participants were instructed to look at the exact opposite direction of the lateral stimulus as fast 