Figure 1From: Associations between a neurophysiological marker of central cholinergic activity and cognitive functions in young and older adultsScatter plots showing the associations between SAI levels and composite z scores of (A) memory and (B) executive functions. SAI levels correspond to the modulation of motor evoked potentials (MEP) induced by afferent conditioning at an inter-stimulus interval (ISI) of 20 ms (% Conditioned MEP/Unconditioned MEP).Back to article page