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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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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.
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Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
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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...
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Related Experiment Video

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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Temporal variability profiling of the default mode across epilepsy subtypes.

Siqi Yang1,2, Zhiqiang Zhang3, Huafu Chen1,2

  • 1The Clinical Hospital of Chengdu Brain Science Institute, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.

Epilepsia
|November 25, 2020
PubMed
Summary

Epilepsy subtypes show shared and distinct alterations in the brain's default mode network (DMN). These findings reveal common DMN abnormalities and subtype-specific dysfunctions in epilepsy patients compared to controls.

Keywords:
default modedistinct alterationsdynamic functional connectivityepilepsiesepilepsy-shared

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Area of Science:

  • Neuroscience
  • Neurology
  • Brain Imaging

Background:

  • Epilepsies are diverse neurological disorders with varied causes and symptoms.
  • Abnormalities in the brain's default mode network (DMN) are observed in various epilepsy subtypes.
  • Understanding these DMN alterations is crucial for differentiating epilepsy types.

Purpose of the Study:

  • To investigate shared and distinct alterations in the DMN across different epilepsy subtypes.
  • To analyze the temporal dynamics of the DMN in temporal lobe epilepsy (TLE), frontal lobe epilepsy (FLE), and genetic generalized epilepsy with generalized tonic-clonic seizures (GGE-GTCS).

Main Methods:

  • Resting-state functional magnetic resonance imaging (fMRI) data from 371 epilepsy patients and 150 healthy controls were analyzed.
  • Temporal dynamics profiling of the DMN, including edge-wise and node-wise temporal variabilities, was performed.
  • Recurrent dynamic states of functional connectivity were examined to identify abnormalities.

Main Results:

  • Hypervariable edges in a specific DMN subsystem were common across all epilepsy subtypes.
  • Deficits in node-wise temporal variability were prominent in TLE and FLE, but less so in GGE-GTCS.
  • Dynamic states of functional connectivity were generally less stable in patients with epilepsy compared to healthy controls.

Conclusions:

  • The study identified general DMN abnormalities common to various epilepsies.
  • Distinct DMN dysfunctions were observed specific to epilepsy subtypes.
  • Findings provide insights into the relationship between epilepsy pathophysiology and brain connectivity.