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Related Experiment Video

Updated: Mar 17, 2026

Corticospinal Excitability Modulation During Action Observation
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Event related desynchronisation predicts functional propriospinal myoclonus.

A M Meppelink1,2, S Little1, A Oswal1

  • 1Sobell Department of Motor Neuroscience and Movement Disorders, University College London (UCL), Institute of Neurology, London, United Kingdom.

Parkinsonism & Related Disorders
|August 2, 2016
PubMed
Summary
This summary is machine-generated.

Event-related desynchronisation (ERD) shows promise as a diagnostic tool for functional myoclonus. This EEG measure proved more effective than the Bereitschaftspotential (BP) in a recent study.

Keywords:
EEGMyoclonus

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Area of Science:

  • Neuroscience
  • Neurology
  • Clinical Electrophysiology

Background:

  • Recent diagnostic criteria for functional movement disorders emphasize laboratory support.
  • The Bereitschaftspotential (BP) is a commonly accepted laboratory test for functional myoclonus.
  • The effectiveness of BP as a diagnostic marker for functional myoclonus is under investigation.

Purpose of the Study:

  • To investigate event-related desynchronisation (ERD) as a potential diagnostic marker for functional myoclonus.
  • To compare the diagnostic utility of ERD with the Bereitschaftspotential (BP) in functional myoclonus.

Main Methods:

  • Analysis of 20 patients with functional propriospinal myoclonus (fPSM) and 9 controls with organic myoclonus.
  • EEG data analyzed for Bereitschaftspotential (BP) using back-averaging.
  • EEG data analyzed for event-related desynchronisation (ERD) using time-frequency decomposition.

Main Results:

  • Bereitschaftspotential (BP) was present in only 25% of functional myoclonus patients.
  • A significant ERD (mean 38 Hz, 65% sensitivity) was observed in the majority of functional myoclonus patients.
  • ERD was significant at the group level (p < 0.001), while BP was not (p > 0.05); both were absent in controls.

Conclusions:

  • Event-related desynchronisation (ERD) in the high-beta frequency band may serve as a novel diagnostic test for functional myoclonus.
  • ERD demonstrates higher sensitivity and diagnostic value compared to BP for functional myoclonus.