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Correlation of the inhibitory effect of the short afferent inhibition (SAI) protocol (Motor Evoked Potential after, relative to before SAI) and volume of the basal forebrain cholinergic system (BFCS) in mild cognitive impairment (MCI) and healthy controls (HC). For the MEP amplitude ratio, smaller values indicate a stronger inhibition. *Significant at α= 0.05, two-tailed.
