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Illustration of the assessment of structure (top; volume of the basal forebrain - CH1-3 blue, CH4 red) and function (bottom; short afferent inhibition) of the cholinergic system in our study. The main cholinergic projections of the basal forebrain are schematically depicted on the top right. MNS, median nerve stimulation; APB, abductor pollicis brevis; TMS, transcranial magnetic stimulation; ISI, interstimulus interval.
