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Related Concept Videos

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...
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,...
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:
Overview of Synapses01:25

Overview of Synapses

A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
Seizures ll: Types01:19

Seizures ll: Types

Seizures are sudden bursts of abnormal electrical discharge in the brain that interfere with normal function. They are commonly divided into three groups: focal seizures, generalized seizures, and other types that do not fit neatly into either category.Focal SeizuresFocal seizures begin in a single brain region. When awareness is preserved, they are called focal aware seizures and may cause sensations such as tingling, unusual smells, or flashing lights. When awareness is impaired, they are...
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: Jun 27, 2026

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

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Published on: December 18, 2016

Evolving functional network properties and synchronizability during human epileptic seizures.

Kaspar A Schindler1, Stephan Bialonski, Marie-Therese Horstmann

  • 1Department of Epileptology, University of Bonn, Sigmund-Freud-Strasse 25, 53105 Bonn, Germany. kaspar.schindler@gmail.com

Chaos (Woodbury, N.Y.)
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

This study analyzed brain network dynamics during epileptic seizures. Findings reveal significant changes in functional topology and synchronizability, offering new insights into seizure complexity.

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy
08:23

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

Published on: November 13, 2016

Area of Science:

  • Neuroscience
  • Complex Systems Analysis
  • Network Science

Background:

  • Epileptic seizures represent a complex neurological disorder characterized by abnormal electrical brain activity.
  • Understanding the dynamic changes in brain networks during seizures is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the temporal evolution of functional brain network topology and synchronizability before, during, and after epileptic seizures.
  • To apply complex network theory to analyze brain dynamics in epilepsy.

Main Methods:

  • Analysis of electrical brain dynamics from 100 human epileptic seizures.
  • Statistical and spectral properties of functionally defined brain networks were assessed.
  • Evaluation of characteristic path length and cluster coefficient for functional topology changes.

Main Results:

  • Observed a concave-like temporal evolution in characteristic path length and cluster coefficient, indicating shifts from random to regular and back to random functional topology.
  • Found a significant decrease in synchronizability during seizures, with an increase preceding seizure termination.
  • Demonstrated the utility of complex network analysis in understanding brain dynamics during seizures.

Conclusions:

  • The study highlights the dynamic and complex nature of brain networks during epileptic seizures.
  • Complex network approaches provide valuable insights into the underlying mechanisms of epilepsy.
  • Findings suggest potential biomarkers for seizure prediction or monitoring.