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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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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:
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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...
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Related Experiment Video

Updated: Mar 17, 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

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A decrease of ripples precedes seizure onset in mesial temporal lobe epilepsy.

Cenglin Xu1, Shuang Wang2, Yi Wang1

  • 1Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, Hangzhou, China.

Experimental Neurology
|July 27, 2016
PubMed
Summary
This summary is machine-generated.

Preictal high-frequency oscillations (HFOs) show distinct patterns before seizures in epilepsy models and patients. Ripple reduction before seizures may aid in understanding ictogenesis and diagnosing seizure types.

Keywords:
High frequency oscillationsMesial temporal lobe epilepsyPreictal

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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Biomarker Discovery

Background:

  • High-frequency oscillations (HFOs) are potential biomarkers for epileptic foci.
  • Understanding preictal HFO changes is crucial for seizure prediction and understanding ictogenesis.

Purpose of the Study:

  • To investigate the characteristic changes of HFOs during the preictal period in epilepsy models and patients.
  • To explore the utility of preictal HFOs as biomarkers for seizure onset and type.

Main Methods:

  • Automated HFO detection methods were employed.
  • Recordings were made in a mouse pilocarpine model and in human patients with mesial temporal lobe epilepsy (mTLE) and neocortical epilepsy.
  • Analysis focused on ripple rates (80-250Hz) in the minute preceding seizures.

Main Results:

  • A decrease in ripple rate was observed in the preictal period for both low-voltage fast (LVF) and hypersynchronous-onset (HYP) seizures in mice.
  • This reduction was mainly attributed to type II ripples (independent of epileptiform discharges).
  • Distinct temporal patterns of ripple changes were noted before LVF and HYP seizures, and a 'ripple reduction' phenomenon was observed in mTLE patients but not in neocortical epilepsy.

Conclusions:

  • Preictal ripple changes may offer insights into the mechanisms of ictogenesis in mTLE.
  • Differential preictal ripple dynamics could potentially aid in diagnosing seizure types.