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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...
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...
Epilepsy and Seizures: Overview01:24

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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...
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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Synchronization implies seizure or seizure implies synchronization?

Kaushik Majumdar1, Pradeep D Prasad, Shailesh Verma

  • 1Systems Science and Informatics Unit, Indian Statistical Institute, 8th Mile, Mysore Road, Bangalore, 560059, India, kmajumdar@isibang.ac.in.

Brain Topography
|April 9, 2013
PubMed
Summary
This summary is machine-generated.

Hypersynchronous neuronal activity, a hallmark of epileptic seizures, was investigated. Findings suggest synchronization is an effect, not the cause, of many focal-onset seizures, potentially aiding drug discovery.

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Area of Science:

  • Neuroscience
  • Epileptology
  • Computational Neuroscience

Background:

  • Epileptic seizures are characterized by abnormal hypersynchronous neuronal activity in the brain.
  • A key question in epilepsy research is whether hypersynchrony causes seizures or results from them.

Purpose of the Study:

  • To investigate the temporal relationship between hypersynchronous neuronal activity and focal-onset epileptic seizures.
  • To determine if neuronal synchronization precedes, coincides with, or follows seizure onset.

Main Methods:

  • Analysis of electrocorticography (ECoG) signals from 21 epilepsy patients with 87 focal-onset seizures.
  • Utilized three measures: phase synchronization, amplitude correlation, and simultaneous occurrence of peaks and troughs.

Main Results:

  • For the majority of focal-onset seizures, synchronization, correlation, or simultaneity was observed towards the end or after seizure offset.
  • These measures were less prevalent at seizure onset or during seizure progression.

Conclusions:

  • Neuronal synchronization appears to be an effect, rather than the cause, of a significant number of pharmacologically intractable focal-onset seizures.
  • Understanding synchronization-dependent seizure termination may offer novel approaches for drug discovery and testing in intractable epilepsy.