Figure 2.

Illustration of MMN to FM tones paradigm. A, In the oddball section, 600 tones were presented: standard tones (300 total/50%) alternated with 1 of the 6 deviants (50 of each deviant tone per block ∼8.33% for each deviant). B, In the repetitive N1 section, 50 repeats of each of the 7 tonal deviants (350 total tones, 50 each) were presented. C, MMN waveforms were assessed as the difference wave of the response to the same stimulus presented in the oddball block versus in the repetitive stimulation block (“like from like”) comparison.