Figure 2

Difference waveforms with original 1S. Difference waveforms obtained by subtracting the 1S waveform are shown. Thus, the waveforms indicate cortical activity due to the presence of the prior different sounds. For comparison, the original waveform for 1S is also shown. Waveforms of both hemispheres are combined. Note the slightly later peak of the difference waveform than the original 1S waveform.