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Related Experiment Video

Updated: May 29, 2026

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Published on: December 6, 2016

Data mining neocortical high-frequency oscillations in epilepsy and controls.

Justin A Blanco1, Matt Stead, Abba Krieger

  • 1Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA. blanco@usna.edu

Brain : a Journal of Neurology
|September 10, 2011
PubMed
Summary

Ripple oscillations, a type of high-frequency brain activity, are more common in the seizure-onset zone of neocortical epilepsy. Their increased rate may serve as a biomarker for epileptic neocortex.

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Published on: December 18, 2016

Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Signal Processing

Background:

  • High-frequency oscillations (HFOs) like ripples (100-250 Hz) and fast ripples (250-500 Hz) are elevated in the seizure-onset zone (SOZ) in mesial temporal lobe epilepsy.
  • Limited data exists on HFO spatial distribution in neocortical epilepsy and their presence in healthy brains.

Purpose of the Study:

  • To quantitatively analyze HFOs and their occurrence rates in neocortical epilepsy.
  • To investigate the spatial distribution of HFOs relative to the SOZ.
  • To compare HFO rates in epileptic neocortex, non-seizure-onset zone, and control neocortex.

Main Methods:

  • Utilized unsupervised automated detection and classification of HFOs.
  • Analyzed over 12 terabytes of continuous intracranial recordings from nine neocortical epilepsy patients and two controls.
  • Employed epipial electrodes for neocortical surface recording, avoiding human preprocessing for bias-free estimates.

Main Results:

  • Ripple oscillations (median spectral centroid 137 Hz) were more frequently increased in the SOZ than fast ripples (median spectral centroid 305 Hz).
  • No significant difference in HFO rates was observed between control neocortex and the non-SOZ neocortex of epilepsy patients.
  • Electrode type (epipial vs. penetrating) did not influence peak HFO frequencies, contrary to previous findings with micro-electrodes.

Conclusions:

  • The elevated rate of ripple oscillations suggests potential as a biomarker for epileptic neocortex.
  • Further large-scale prospective studies are needed to validate HFO rates as predictors of seizure onset, tissue characteristics, and surgical outcomes.