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The sequence of events in a typical trial. Participants fixated on the center of the display (600–1000 ms) prior to the onset of a facial expression. Individual faces were presented for 400–800 ms, after which a black-and-white checkerboard probe flashed (100 ms) over the face. The participants’ task was to respond to the onset of the probe via key press. ERPs were time-locked to the onset of the probe.
