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Event-related potentials of the normal sample. (A) Grand average ERPs of the normal participants (n = 83). A clear phasic negativity is seen in response to the errors starting at the time of the erroneous button press and reaching its maximum at about 70 ms. (B) Distribution of ERN amplitudes (quantified as the mean amplitude 0–100 ms of the error – correct difference wave) in the normal sample. The amplitude of the OCD patient is marked by an arrow.
