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Difference waves to letter (A) and non-letter deviants (B) observed at 10 electrodes (Fz, Fc3, Fc4, Cz, T3, T4, Cpz, P3, P4 and Oz) in the visual experiment (black lines) and the audiovisual experiment (red lines). Besides the two time windows of interest, the assumed auditory MMN time window is indicated in electrode Fz in the letter condition (A).
