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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.
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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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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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 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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Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
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Overview of Synapses01:25

Overview of Synapses

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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...
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Related Experiment Video

Updated: Apr 18, 2026

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Hyperconnectivity in juvenile myoclonic epilepsy: a network analysis.

K Caeyenberghs1, H W R Powell2, R H Thomas3

  • 1Department of Physical Therapy and Motor Rehabilitation, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium ; Department of Movement and Sports Sciences, University of Ghent, Ghent, Belgium.

Neuroimage. Clinical
|January 23, 2015
PubMed
Summary

Juvenile myoclonic epilepsy (JME) involves widespread brain network changes, not just frontal areas. These structural alterations correlate with cognitive impairments, offering new insights into JME's mechanisms.

Keywords:
Diffusion MRIEpilepsyGraph theoryNeuropsychologyStructural connectivity

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy
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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Brain Network Analysis

Background:

  • Juvenile myoclonic epilepsy (JME) is a common epilepsy syndrome linked to cognitive and executive function deficits.
  • Abnormalities in diffuse brain networks, particularly frontal and fronto-thalamic regions, are increasingly recognized in JME.
  • These network dysfunctions impact patients' daily living and psychosocial well-being.

Purpose of the Study:

  • To investigate structural brain network properties in Juvenile Myoclonic Epilepsy (JME) using diffusion MRI and graph theoretical analysis.
  • To identify specific subnetworks associated with JME and their correlation with cognitive performance.
  • To explore the network-level basis of cognitive impairments in JME.

Main Methods:

  • Diffusion MRI and graph theoretical analysis were employed to assess structural brain networks in 34 JME patients and matched controls.
  • Network-based statistic (NBS) was used for bivariate analysis, alongside global and local multivariate network property assessments.
  • Neuropsychological assessments were conducted on a subgroup of 14 JME patients.

Main Results:

  • JME patients showed impaired visual memory and naming, despite normal full-scale IQ.
  • White matter networks in both JME patients and controls exhibited small-world topology without significant global differences.
  • NBS identified a hyperconnected subnetwork in JME patients, encompassing motor, parietal, and subcortical regions.
  • A positive correlation was found between structural connectivity and cognitive task performance.

Conclusions:

  • Structural brain changes in JME extend beyond frontal lobes, affecting distributed network levels.
  • The identified hyperconnected subnetwork involves regions critical for seizure generation and motor control, potentially explaining myoclonic jerks.
  • Analyzing affected subnetworks offers novel perspectives on JME pathophysiology and associated cognitive deficits.