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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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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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Epilepsy ll: Types01:22

Epilepsy ll: Types

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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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Seizures: Classification01:13

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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.
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:
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Seizures l: Introduction01:20

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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,...
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Seizures ll: Types01:19

Seizures ll: Types

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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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Updated: Apr 21, 2026

Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Functional neuroimaging abnormalities in idiopathic generalized epilepsy.

Megan L McGill1, Orrin Devinsky1, Xiuyuan Wang1

  • 1Comprehensive Epilepsy Center, Department of Neurology, New York University School of Medicine, New York, NY 10016, USA.

Neuroimage. Clinical
|November 11, 2014
PubMed
Summary

Idiopathic generalized epilepsy (IGE) shows normal structural MRI but functional MRI reveals reduced brain activity in the thalamus. Functional MRI techniques are more sensitive for detecting brain abnormalities in IGE patients.

Keywords:
DTI (diffusion tensor imaging)IGE (idiopathic generalized epilepsy)fALFF (fractional amplitude of low frequency fluctuations)quantitative morphometry

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Brain Function Analysis

Background:

  • Idiopathic generalized epilepsy (IGE) presents with EEG abnormalities but typically normal structural MRI.
  • Brain network dysfunctions, particularly involving the neocortex and thalamus, are implicated in IGE seizure activity.
  • Quantitative MRI techniques are essential for understanding subtle brain alterations.

Purpose of the Study:

  • To investigate morphometric and functional brain differences in IGE patients compared to healthy controls.
  • To assess the sensitivity of various MRI techniques in detecting brain abnormalities in IGE.
  • To explore alterations in thalamic subregions and their functional connectivity.

Main Methods:

  • Employed diffusion tensor imaging (DTI) and resting-state functional MRI (fMRI) in 27 IGE patients and 27 controls.
  • Measured thalamic volumes, cortical thickness, gray-white matter blurring, fractional anisotropy (FA), and fractional amplitude of low-frequency fluctuations (fALFF).
  • Analyzed DTI for white matter tract integrity and fMRI for functional activity in thalamic subregions, specifically the prefrontal cortex (PFC).

Main Results:

  • No significant differences were found in thalamic volumes, cortical thickness, or gray-white matter contrast between groups.
  • Diffusion tensor imaging revealed no differences in FA values in tracts connecting the thalamus and prefrontal cortex.
  • Functional MRI demonstrated decreased fALFF in the prefrontal cortex subregion of the thalamus in IGE patients, indicating reduced functional activity.

Conclusions:

  • Structural MRI measures like volume and thickness are insufficient for detecting brain abnormalities in IGE.
  • Functional MRI, particularly fALFF analysis in thalamic subregions, is more sensitive in identifying brain alterations associated with IGE.
  • These findings highlight the utility of advanced fMRI techniques for characterizing the neurobiological underpinnings of IGE.