Clinical neurophysiology findings in movement disorders

Test	Myoclonus	Chorea	Dystonia	Tremor
Typical EMG duration	25 to 200 ms	100 to 300 ms	Long: 200 ms to constant	75 to 150 ms for common tremors
Surface EMG pattern	Pulsatile "square wave" with co-contraction between muscles	Constantly changing appearance	Co-contraction between muscles	Sinusoidal oscillatory discharges
EEG	May be abnormal in cortical myoclonus	Normal	Normal	Normal
Somatosensory evoked potentials	May be abnormal in cortical myoclonus	Normal	Normal	Normal
Long latency EMG reflex response	May be abnormal in cortical myoclonus	Usually normal	Usually normal	Usually normal

EMG: electromyography; EEG: electroencephalography.

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