3.3 MMN
A one-sample t-test was conducted to compare the average peak amplitude in the MMN time window of the difference wave (deviants minus final tones in the 4th to 30th positions) with zero. The analysis revealed that the amplitude was significantly lower than zero (M = -1.01 μV, SD = 0.60 μV; t36 = -10.28, P < .001), indicating the elicitation of MMN. Figure 4 illustrates the MMN-related difference wave and topography, characterized by fronto-central negativity and temporal positivity.