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Related Experiment Videos

Photic cortical reflex myoclonus.

H Shibasaki1, R Neshige

  • 1Department of Internal Medicine, Saga Medical School, Japan.

Annals of Neurology
|August 1, 1987
PubMed
Summary
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Flash-evoked myoclonus in three patients suggests a cortical reflex mechanism. Enhanced electroencephalographic (EEG) responses preceded myoclonic jerks, indicating a central nervous system origin for this reflex.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Flash-evoked myoclonus is a neurological phenomenon.
  • Understanding its underlying mechanisms is crucial for diagnosis and treatment.

Purpose of the Study:

  • To electrophysiologically investigate the mechanism of flash-evoked myoclonus.
  • To determine the cortical involvement in the reflex pathway.

Main Methods:

  • Electrophysiological study of three patients with flash-evoked myoclonus.
  • Analysis of electroencephalographic (EEG) responses and myoclonic jerk latencies.
  • Investigation of cortical excitability recovery after stimulation.

Main Results:

  • Myoclonic jerks occurred at a fixed latency after photic stimuli.

Related Experiment Videos

  • Enhanced cortical evoked potentials preceded myoclonic jerks.
  • EEG responses were widespread, maximal centrally, with occipital leading frontocentral by 3.4-5.1 ms.
  • A period of enhanced excitability was observed for both central and peripheral phenomena.

    • Conclusions:

    • Findings strongly suggest a cortical reflex mechanism for flash-evoked myoclonus.
    • The precise role of the occipital cortex in photic cortical reflex myoclonus requires further elucidation.