Fig. 2.

Time course of the MMN (standard minus oddball) for control (top) and patient (bottom) groups. Scalp topographic maps extracted for 5-ms time windows over prominent peaks at a midline frontal site are depicted (FCz); AEPs to the standard and oddball are included for reference with the time windows shaded in gray. The topographic maps further depict the MMN (shaded in gray) delay noted in the patient group, with a strong frontal negativity representing this response occurring at 155–160 ms, whereas in the controls, this response is most prominent 115–120 ms. Red and blue opaque shading around the waveform plots reflect standard errors