All ERP data were analyzed using EEGLab (Delorme and Makeig,
2004) and ERPLAB (http://erpinfo.org/erplab) toolboxes implemented
in Matlab. ERP data were digitally band-pass filtered (0.01 Hz–30 Hz).
Trials were visually inspected and those contaminated by artifacts including
ocular movements were rejected. After trial rejection, participants
with less than 40 trials in each condition (out of 80 initial trials)
were rejected. The N170 was maximal at electrodes CB1 and CB2 and
was thus measured at these sites between 120 and 220 ms poststimulus-
onset using automatic peak detection. The P1 component
was similarly measured at these electrodes between 50 and 150 ms
and analyzed to determine whether the effects reported on the N170
were face-specific.