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Presence of robust mismatch negativity (MMN) responses in individual patient subgroups of amyotrophic lateral sclerosis (ALS). The MMN waveforms in controls (n = 19), spinal-onset ALS (n = 67), bulbar-onset ALS (n = 15), ALS-FTD (n = 7), ALS patients with C9ORF72 repeat expansion, and with no C9ORF72 repeat expansion are shown. The thick curves indicate the significant responses (p < 0.05).
