EEG data were recorded with a BioSemi Active Two system (BioSemi, Amsterdam, Netherlands) at a sampling frequency of 2,048 Hz. Subjects of the first batch were fitted with a standard, 32-electrode cap following the international 10/20 system, while subjects in the second batch were fitted with a 128-electrode cap according to an equiradial system (Biosemi). Six additional electrooculogram (EOG) electrodes were placed around the eyes to record and allow for the removal of eye-movement artifacts. Sony MDR 7506 headphones were used for audio playback during video viewing for the first batch of subjects, whereas the second batch of subjects were presented the audio over a pair of studio monitors, each situated at a 45° angle to the subject (e.g., left/right side) and at a distance of approximately 1 m (Fostex, PM0.3 Active monitors, Tokyo, Japan).
For this investigation, we pooled the data of the two EEG batches. To this end, 32 out of 128 electrodes used in the second batch of recordings were matched with the 32 electrodes used in the first batch of recordings based on nearest Euclidean distance of their standardized locations (median distance: 6 mm, maximum: 12 mm). This yielded N = 45 recordings with 32 EEG and six EOG electrodes available in each.
For this investigation, we pooled the data of the two EEG batches. To this end, 32 out of 128 electrodes used in the second batch of recordings were matched with the 32 electrodes used in the first batch of recordings based on nearest Euclidean distance of their standardized locations (median distance: 6 mm, maximum: 12 mm). This yielded N = 45 recordings with 32 EEG and six EOG electrodes available in each.