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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:
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...

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Related Experiment Video

Updated: Jul 5, 2026

Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue
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Pro-Ictal State in Human Temporal Lobe Epilepsy.

Adeel Ilyas1,2,3, Omar A Alamoudi3,4,5, Kristen O Riley1

  • 1Department of Neurological Surgery, University of Alabama at Birmingham, Birmingham, AL.

NEJM Evidence
|February 6, 2024
PubMed
Summary

Researchers identified distinct pro-ictal states, periods of heightened seizure risk, in temporal lobe epilepsy patients using thalamocortical electroencephalography (EEG). These pathologic brain activities were detected over 30 minutes before seizure onset, aiding in seizure prediction.

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Signal Processing

Background:

  • Continuous electroencephalography (EEG) studies suggest focal-onset epilepsy seizures occur during high-risk periods, known as pro-ictal states.
  • The presence of these pathologic pro-ictal states amidst normal physiologic brain activity has not been definitively established.

Purpose of the Study:

  • To establish the presence and predictability of pro-ictal states in temporal lobe epilepsy (TLE).
  • To differentiate pathologic pro-ictal brain activity from normal physiologic states using deep neural networks.

Main Methods:

  • Prospective study of 15 TLE patients with thalamocortical and cortical intracranial EEG recordings.
  • Analysis of pro-ictal (45 min pre-seizure) and interictal EEG segments using a deep neural classifier.
  • Patient-specific classification model trained and validated on 10-minute EEG windows.

Main Results:

  • Distinct pro-ictal states were identified in all 15 participants.
  • A deep neural classifier achieved a median area under the receiver-operating characteristic curve of 0.92.
  • Pro-ictal states were detected at least 45 minutes prior to seizure onset in 13 of 15 patients.

Conclusions:

  • Thalamocortical EEG can identify pro-ictal states in TLE patients.
  • Pro-ictal states, indicative of heightened seizure risk, were detected over 30 minutes before seizure onset.
  • This finding supports the potential for early seizure prediction in TLE.