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Related Concept Videos

Brain Waves01:23

Brain Waves

Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
Epilepsy ll: Types01:22

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.

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Related Experiment Video

Updated: May 23, 2026

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
10:22

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

Published on: December 6, 2016

High-frequency oscillations (HFOs) in clinical epilepsy.

J Jacobs1, R Staba, E Asano

  • 1Department of Neuropediatrics and Muscular Diseases, University of Freiburg, Freiburg, Germany. julia.jacobs@gmx.de

Progress in Neurobiology
|April 7, 2012
PubMed
Summary

High-frequency oscillations (HFOs) are promising biomarkers for identifying the epileptogenic zone in epilepsy. Their removal correlates with seizure freedom, suggesting HFOs can guide epilepsy surgery.

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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Published on: December 18, 2016

Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Epileptology

Background:

  • Epilepsy is a common neurological disorder, with medically refractory cases often requiring surgery.
  • Identifying the epileptogenic zone is crucial for successful surgical outcomes in focal epilepsy.
  • High-frequency oscillations (HFOs) are potential biomarkers for the epileptogenic zone.

Purpose of the Study:

  • To review the clinical importance and application of HFOs as markers of epileptogenicity.
  • To discuss the role of HFOs in various epilepsy types, including pediatric epilepsies.
  • To explore the potential of HFOs detected via scalp EEG and MEG.

Main Methods:

  • Review of existing literature on HFOs in epilepsy.
  • Analysis of HFOs recorded with EEG and MEG.
  • Correlation of HFOs with seizure onset zones and surgical outcomes.

Main Results:

  • HFOs are strongly linked to the seizure onset zone; surgical removal of HFO-generating regions improves seizure control.
  • HFOs reflect seizure-generating capacity, increasing with antiepileptic drug reduction.
  • HFOs show promise in pediatric epilepsies like epileptic spasms.

Conclusions:

  • HFOs are promising biomarkers for epileptic tissue, aiding in surgical planning.
  • Further research is needed to understand HFO generation mechanisms, analysis methods, and clinical applicability.
  • Large multicenter prospective studies are required before HFO analysis becomes a routine clinical procedure.