Amplitude dynamics in corticospinal interactions

Corticomuscular interactions are investigated mostly with phase coherence of EEG/EMG which, however, is not informative about the local dynamics of interacting cortical and spinal neuronal populations. Here, we investigated the amplitude dynamics of sensorimotor EEG beta oscillations during an isometric task and their relation to corticomuscular coherence (CMC). The amplitude-envelopes of beta oscillations, obtained from multichannel EEG and EMG recordings, respectively, were used as a measure of local cortical and spinal cord synchronization. Upon an imperative stimulus, the amplitude of cortical beta oscillati…