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Related Concept Videos

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:
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
Seizures l: Introduction01:20

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

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Related Experiment Video

Updated: Jul 9, 2026

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
09:32

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

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Non ictal onset zone: A window to ictal dynamics.

Pegah Afra1, Sara J Hanrahan2, Spencer Sterling Kellis3

  • 1Department of Neurology, School of Medicine, University of Utah, Salt Lake City, UT, United States.

Epilepsy & Behavior Case Reports
|December 6, 2017
PubMed
Summary

This study compared neuronal activity during seizures, finding that action-potential changes in the mesial-temporal lobe preceded observable shifts in local field potentials or electrocorticography in the middle temporal gyrus, offering new insights into epilepsy networks.

Keywords:
Ictal dynamicsIctal onsetMicroelectrode arrayMicrogridSingle neuron recording

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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
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Area of Science:

  • Neuroscience
  • Epileptology
  • Computational Neuroscience

Background:

  • Epilepsy is understood through focal (localized) and network (widespread) seizure concepts.
  • Surgical evaluation for epilepsy often involves electrophysiological monitoring.

Observation:

  • A 23-year-old male patient underwent surgical evaluation using electrocorticography (ECoG) and microelectrode-array (MEA) in the left middle temporal gyrus (MTG).
  • Action potentials (AP) and local field potentials (LFP) from MEA were compared with ECoG signals.

Findings:

  • Seizure onset in the mesial-temporal lobe initially manifested as altered AP firing patterns.
  • These early seizure changes were not clearly reflected in simultaneously recorded LFP or ECoG from the MTG.

Implications:

  • Simultaneous analysis of neuronal activity across different spatial scales (MEA vs. ECoG) and frequency ranges (AP vs. LFP) provides complementary insights.
  • Understanding the interplay between focal and network activity is crucial for characterizing ictal dynamics and developing targeted epilepsy treatments.