Apparatus
Participants were seated 57 cm from a 29 X 51 cm 60Hz LCD monitor. Head
position was stabilized with a chin rest. The experiment was programmed
in Python on open source PsychoPy software (Peirce, 2007). EEG data was
recorded continuously from 64 scalp electrodes arranged according to the
extended international 10-20 system. We used the BioSemi active-two EEG
system, sampling at 512 Hz. To control for eye movements and blinks
bipolar HEOG and VEOG were monitored online. These external channels
were not included in any analyses.