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Bipolar EMG from right first dorsal interosseous (FDI) and wrist extensors (Extensors) during posture in cortical tremor: high frequent bursts of <0.05 s (13–18 Hz) and essential tremor: rhythmic bursts at a frequency of approximately 6 Hz; burst duration is >0.05 s (figure adapted from van Rootselaar et al., 2006).
