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Brainstem speech coding provides a stronger biomarker of MCI severity than cortex. a, Pooling across speech tokens, stronger neural activity at the level of the brainstem predicts higher severity of MCI (i.e., lower MOCA scores). b, MCI severity is not reliably predicted by cortical speech response amplitudes. Solid lines indicate significant correlation; dotted lines are insignificant correlation. **p < 0.01.
