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Schematic illustration for physiologic diagnostic approach for “jerk‐like” movements. Based on surface EMG recordings, jerk‐like movements can be categorized into 3 major categories based on burst duration: (1) <50 milliseconds, (2) 50 to 100 milliseconds, and (3) >100 milliseconds. BP, Bereitschaftspotential recording; ECR, extensor carpi radialis; EMG, electromyogram; FCR, flexor carpi radialis; LLR, long latency reflex; SCM, sternocleidomastoid muscle; SEP, sensory‐evoked potential.
