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Grand average ERPs of the 17 subjects in the parietal electrodes (PO7, P7) and (PO8, P8) elicited by the real and the computer generated faces for the first 100 trials. There is a significant difference in the P200, mainly in the parietal left electrodes. A low pass filter (15 Hz, half-amplitude cut-off) was applied in these grand averaged graphs.
