Article Text

PDF

Presence of Bereitschaftspotential preceding psychogenic myoclonus: clinical application of jerk-locked back averaging.
  1. K Terada,
  2. A Ikeda,
  3. P C Van Ness,
  4. T Nagamine,
  5. R Kaji,
  6. J Kimura,
  7. H Shibasaki
  1. Department of Brain Pathophysiology, Kyoto University School of Medicine, Japan.

    Abstract

    The method of jerk-locked back averaging was applied to six patients with clinically diagnosed psychogenic myoclonus. Five patients had a slow negative EEG shift corresponding to Bereitschaftspotential at the central region starting 0.7 to 2.1 seconds before the onset of the myoclonic jerk. One patient had no potential preceding the myoclonic jerk, whereas a small negative potential preceded the voluntary movement mimicking the jerk. The demonstration of Bereitschaftspotential before an apparently involuntary myoclonic jerk helps the clinical diagnosis of psychogenic myoclonus, although the absence of Bereitschaftspotential does not necessarily indicate that the movement is involuntary. Jerk-locked back averaging is clinically useful as a specific laboratory examination in this condition.

    Statistics from Altmetric.com

    Request permissions

    If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.