Frequency-coherence plots. Frequency-coherence plots for EEG-EMG coherence during static force (SF) condition (left panel) during small dynamic (sD) condition (middle panel) and large dynamic (lD) condition (right panel) for single subjects and as grand average. The beta-range (15–30 Hz) is marked in light grey, the gamma-range (30–45 Hz) in dark grey. Note that during the SF condition the most prominent activity occurs in the beta-range. During both dynamic conditions previous beta-range coherence is decreased and the general activity is shifted towards high frequencies, principally in gamma-range. During sD condition remains significant beta-range CMC, which is absent during lD condition.