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Related Concept Videos

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 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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Related Experiment Video

Updated: Jan 2, 2026

Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Thalamo-cortical network dysfunction in temporal lobe epilepsy.

Giovanni Assenza1, Jacopo Lanzone1, Angelo Insola2

  • 1Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, Rome, Italy.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|December 11, 2019
PubMed
Summary
This summary is machine-generated.

Temporal lobe epilepsy (TLE) causes early network dysfunction, impacting thalamo-cortical pathways. This study used high-frequency oscillations of somatosensory evoked potentials (HF-SEP) to detect these impairments in drug-naïve patients.

Keywords:
Cortical oscillationsEpilepsyHigh frequency oscillationsSEPTemporal lobe epilepsy

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Area of Science:

  • Neuroscience
  • Epileptology
  • Clinical Neurophysiology

Background:

  • Focal epilepsy, particularly temporal lobe epilepsy (TLE), is increasingly viewed as a network disorder.
  • Dysfunction extends beyond the epileptic focus, involving deep brain structures like thalamo-cortical projections.

Purpose of the Study:

  • To demonstrate interictal functional impairment of the thalamo-cortical network in drug-naïve TLE patients.
  • To investigate high-frequency oscillations of somatosensory evoked potentials (HF-SEP) as a marker of TLE-related network dysfunction.

Main Methods:

  • Bilateral median nerve HF-SEP were recorded from 12 drug-naïve TLE patients and 12 healthy controls (HC).
  • Scalp electrodes were used, and specific electrode traces (Cp3'-Fz, Cp4'-Fz) were filtered (400-800 Hz) to isolate HF-SEP.

Main Results:

  • HF-SEP duration was significantly longer in the affected hemisphere of TLE patients compared to their unaffected hemisphere and HC.
  • No significant inter-hemispheric differences were observed in HF-SEP wavelet areas, powers, or latencies.

Conclusions:

  • TLE leads to early, interictal functional impairments within the thalamo-cortical network.
  • HF-SEP provides a novel neurophysiological tool for evaluating therapies in focal epilepsy.