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Fluctuations in cortical excitability is a candidate mechanism involved in the trial-to-trial variation of motor evoked potentials (MEPs) to transcranial magnetic stimulation. We explore if oscillations in the infraslow (0.01–0.1Hz), delta, theta, alpha and beta frequency bands are possible modulators of cortical excitability.In ten healthy subjects 200 single pulses were given at the resting motor...