Magnetic isofield maps (A-left), and dipole sources (A-right), which were superimposed on the MRI of individual subjects, were selected; and examples from a TD individual are shown.

<p>M50, M100 average waveforms as examples from each of the 3 groups were selected and are shown (B). Vertical lines on the averaged waveform trace indicate stimulus onset (0 msec). Arrows point to M50; and dashed arrows, to M100. The response duration of early auditory processing was determined as the interval between the rising point of the M50 and the returning point to baseline of the M100.