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Figure 1: Essential tremor: The tremor frequency is 5 Hz and the EMG also shows co-contraction of the agonist and antagonist muscles. A sample of the patient's handwriting, and the Archimedes spiral drawn by him is also shown

Figure 1: Essential tremor: The tremor frequency is 5 Hz and the EMG also shows co-contraction of the agonist and antagonist muscles. A sample of the patient's handwriting, and the Archimedes spiral drawn by him is also shown