EEG recording
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BRAIN
EEG was recorded simultaneously during the eye-tracking sessions described above. We used an elastic cap with 128 electrodes mounted in a spherical array (Easy-Cap GmbH, Herrsching, Germany). To maintain electrode impedances below 10 kΩ, conduction gel was applied. The used caps were standardized and placed according to the 10/10 system. All data were recorded on a BrainAmp® standard amplifier (Brain Products GmbH, Gilching, Germany), low-pass filtered at 1 kHz and digitized at a sampling rate of 5 kHz. In addition to the scalp EEG electrodes, an electrocardiogram electrode was placed for recording of cardiac activity.