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Related Concept Videos

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 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.
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...

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Related Experiment Video

Updated: Jun 26, 2026

Generation of Local CA1 &#947; Oscillations by Tetanic Stimulation
08:02

Generation of Local CA1 γ Oscillations by Tetanic Stimulation

Published on: August 14, 2015

Epileptiform synchronization in the cingulate cortex.

Gabriella Panuccio1, Giulia Curia, Alfredo Colosimo

  • 1Department of Neurology, Montreal Neurological Institute , McGill University, Montreal, QC, Canada.

Epilepsia
|January 31, 2009
PubMed
Summary
This summary is machine-generated.

Epileptic seizures originate in the anterior cingulate cortex (ACC). Mu-opioid receptor activation modulates both excitatory and inhibitory signaling, influencing seizure activity in the ACC.

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Last Updated: Jun 26, 2026

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08:02

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Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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09:06

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Published on: December 22, 2016

Area of Science:

  • Neuroscience
  • Epileptology
  • Pharmacology

Background:

  • The anterior cingulate cortex (ACC) is implicated in pain, emotion, and behavior, and can generate epileptic seizures.
  • Neuronal mechanisms underlying epileptiform synchronization in the ACC are not well understood.
  • The ACC has a high density of opioid receptors, suggesting a role for opioids in its function.

Purpose of the Study:

  • Investigate the roles of excitatory and inhibitory synaptic transmission in ACC epileptiform activity.
  • Examine the effects of opioid agonism on epileptiform synchronization within the ACC.

Main Methods:

  • Utilized field and intracellular recordings in rat ACC brain slice preparations.
  • Employed pharmacological manipulations to characterize epileptiform activity.
  • Administered 4-aminopyridine (4AP) to induce epileptiform discharges.

Main Results:

  • 4-aminopyridine (4AP) induced interictal-like and ictal-like epileptiform synchronization.
  • N-methyl-D-aspartate (NMDA) receptors contributed to ictal activity.
  • Mu-opioid receptor activation suppressed 4AP-induced ictal events and reduced GABAergic synchronous potentials.
  • GABAergic antagonism led to GABA-independent activity influenced by mu-opioid agonists.

Conclusions:

  • Both glutamatergic and GABAergic signaling are crucial for generating electrographic ictal events in the ACC.
  • Mu-opioid receptors modulate both excitatory and inhibitory mechanisms, thereby influencing epileptiform synchronization in the ACC.