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Surface EMG of organic and functional tremor. A: Alternating rhythmic EMG bursts are recorded over the wrist extensor and flexor muscles. Rest or postural tremor may have a similar electrophysiologic appearance and will be characterized by limb position during recording. B: Patient performs finger tapping at pre-set frequencies with the left hand (LH). The tremor in the right hand (RH) becomes variable in frequency.
