A one-sample t-test of the difference wave of deviants (tones in the
1st position) minus final tones in the
4th to 30th positions confirmed that
the average peak amplitude was significantly smaller than zero (M= -0.91 μV, SD = 0.47 μV; t (34) = -11.59, p< .001), showing that the MMN was elicited. The MMN waveform
and topography with fronto-central negativity and temporal positivity
are shown in Figure 3.