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Mean MMN amplitudes for the Opt1 paradigm and MemTra paradigm within groups. Mean values are the averaged signal of the fronto-central electrodes Fz, FCz, and Cz. Opt1, Optimum–1; MemTra, Memory Trace; aMCI, amnestic MCI; naMCI, non-amnestic MCI; SMI, subjective memory impairment.
