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Grand averages (n = 24) of mismatch negativity (MMN) difference waves under ketamine administration (dashed lines) and placebo administration (solid lines). (A) Difference between standard and duration-deviant trials. (B) Difference between standard and frequency-deviant trials. A reduction of MMN peak amplitudes under ketamine administration at the frontal electrode Fz can be observed between 80 ms and 200 ms. *p < 0.05, **p < 0.01.
