EEGs were recorded for each participant during performance of the visual target detection task. EEG was acquired on a 64-channel Neuroscan SynAmps2 system with Scan 4.3 acquisition software (Compumedics Neuroscan Inc., 2008). A cephalic reference electrode (close to Cz) was used for all recordings. Left and right earlobe electrodes were also used for obtaining signals for re-referencing of data offline. The ground electrode was placed 8 cm above the nasion. Electrode site impedances were kept below 10 kΩ. A vertical electro-oculogram (EOG) was recorded from bipolar electrodes placed above and below the left eye for use in offline reduction of ocular artifacts. The EEG and EOG channels were sampled at 250 Hz and stored for offline analysis.
