Tremor is defined as a rhythmical, involuntary oscillatory movement of a body part. Although neurological examination reveals information regarding its frequency, regularity, amplitude, and activation conditions, the electrophysiological investigations help in confirming the tremor, in differentiating it from other hyperkinetic disorders like myoclonus, and may provide etiological clues. Accelerometer with surface electromyogram (EMG) can be used to document the dominant frequency of a tremor, which may be useful as certain frequencies are more characteristic of specific etiologies than others hyperkinetic disorders. It may show rhythmic bursts, duration and activation pattern (alternating or synchronous). Myoclonus is a quick, involuntary movement. Electrophysiological studies may helpful in the evaluation of myoclonus, not only for confirming the clinical diagnosis but also for understanding the underlying physiological mechanisms. Electroencephalogram (EEG)-EMG correlates can give us important information about myoclonus. Jerk-locked back-averaging and evoked potentials with recording of the long-latency, long-loop reflexes are currently available to study the pathophysiology of myoclonus.

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• DBS in tremor with dystonia: VIM, GPi or both? A review of the literature and considerations from a single-center experience
  Davide Paoli, Russell Mills, Una Brechany, Nicola Pavese, Claire Nicholson
  Journal of Neurology.2023; 270(4): 2217.     CrossRef
• Posthypoxic Segmental Spinal “Flutter”-Like Myoclonus
  BobyV Maramattom
  Neurology India.2022; 70(5): 2202.     CrossRef
• The diagnostic value of clinical neurophysiology in hyperkinetic movement disorders: A systematic review
  S. van der Veen, M.R. Klamer, J.W.J. Elting, J.H.T.M. Koelman, A.M.M. van der Stouwe, M.A.J. Tijssen
  Parkinsonism & Related Disorders.2021; 89: 176.     CrossRef
• How can neurophysiological studies help with movement disorders characterization in clinical practice? A review
  Talyta GRIPPE, Natalia Spinola Costa da CUNHA, Pedro Renato de Paula BRANDÃO, Rubens Nelson Morato FERNANDEZ, Francisco Eduardo Costa CARDOSO
  Arquivos de Neuro-Psiquiatria.2020; 78(8): 512.     CrossRef
• Epileptic and non-epileptic paroxysmal motor phenomena in newborns
  Carlotta Facini, Carlotta Spagnoli, Francesco Pisani
  The Journal of Maternal-Fetal & Neonatal Medicine.2016; 29(22): 3652.     CrossRef