Continuous EEG recordings were epoched from 1000 ms pre- to 2000 ms post-stimulus, and re-referenced to averaged mastoid sites. Data were then corrected for ocular artifacts using an algorithm developed by Semlitsch, Anderer, Schuster, and Presslich (1986), implemented in the Neuroscan Edit 4.5 software (Neuroscan, Inc.). Finally, data were downsampled to 128 Hz using the Matlab resample function (Mathworks, Inc.). These 3 second epochs were baseline-corrected for the 150 ms preceding stimulus onset. Two methods of data cleaning were undertaken. First, a two-step method for trial-level rejection was employed: 1) whole trials were rejected if activity at two frontal sites (equivalent to F3 and F4 from the 10-20 system) exceeded ± 75 μV in either the pre- (-1000 to -1 ms) or post-stimulus (1 to 2000 ms) time windows (relative to one another), and 2) activity at individual sites that exceeded ± 100 μV within each trial (based on the same pre- and post-stimulus time regions) were also omitted from analysis. Using these criteria, 9.7% of trials were excluded. Additionally, across all subjects and electrodes, a total of 10 electrodes
