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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...
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.
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:
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...

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Related Experiment Video

Updated: May 14, 2026

Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
09:07

Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins

Published on: August 15, 2017

[Brain maturation and epilepsy].

Olivier Dulac1, Mathieu Milh

  • 1Service de neuropĂ©diatrie, hĂ´pital Necker, AP-HP, 75015 Paris, France. olivier.dulac@nck.aphp.fr

La Revue Du Praticien
|February 22, 2013
PubMed
Summary
This summary is machine-generated.

Brain maturation influences epilepsy development, with early excitability linked to neonatal seizures and later hyperexcitability to syndromes like West. Myelination aids spike synchronization, impacting seizure presentation.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Epileptology

Context:

  • Early brain development involves the emergence of glutamate and gamma-aminobutyric acid (GABA) synapses.
  • Myelination of cerebral hemispheres and the formation of long tracts are ongoing processes.
  • Immature cortical excitability plays a crucial role in various epilepsy syndromes.

Purpose:

  • To explore the relationship between brain maturation, synaptic development, and the emergence of different epilepsy types in infants and children.
  • To elucidate the mechanisms underlying age-dependent cortical hyperexcitability and its clinical manifestations.
  • To understand how developmental processes influence seizure generation and synchronization.

Summary:

  • Glutamate and GABA neurotransmission are initially excitatory, with premature N-methyl-D-aspartate (NMDA) transmission potentially causing neonatal myoclonic encephalopathy.
  • Excessive or premature cortical excitability is implicated in benign neonatal seizures, migrating partial seizures, benign rolandic epilepsy, and continuous spikes and waves during slow sleep.
  • West and Lennox-Gastaut syndromes are linked to age-dependent cortical hyperexcitability, with myelination influencing spike synchronization.
  • Idiopathic generalized epilepsy arises from brain maturation-induced frontal hyperexcitability, leading to myoclonic-astatic seizures.
  • The protracted maturation of the hippocampal-neocortical system may explain the low incidence of cortical injuries from lesions in infants.

Impact:

  • Provides insights into the neurobiological underpinnings of early-onset epilepsy syndromes.
  • Highlights the critical role of developmental timing in epilepsy pathogenesis.
  • Suggests potential targets for therapeutic interventions aimed at modulating early brain excitability.