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Seizures: Classification

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:

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Related Experiment Video

Updated: Jan 11, 2026

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale

Published on: July 8, 2025

Tailored provocation in functional seizures, a pilot study.

Hendriëtte van Loo-Flier¹, Christoph Stephan Dietze¹, Anne Marthe Meppelink¹

¹Stichting Epilepsie Instellingen Nederland (SEIN), the Netherlands.

Epilepsy Research

|November 16, 2025

Summary

This summary is machine-generated.

Tailored Provocation (TP) successfully induced habitual seizures in 60% of patients with suspected functional seizures (FS) during EEG testing. This method shows promise for improving diagnosis and is feasible for future research.

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Area of Science:

Neurology
Clinical Neurophysiology

Background:

Functional seizures (FS) may be triggered by stimuli acting as conditioned reflexes.
Tailored Provocation (TP) utilizes individual stimuli to potentially elicit seizures during EEG.

Purpose of the Study:

To assess if Tailored Provocation (TP) can provoke habitual seizures in patients with probable functional seizures (FS).
To evaluate the feasibility of future research on TP for FS diagnosis.

Main Methods:

Individual TP stimuli were identified and assessed for applicability.
TP was applied during EEG recording alongside standard tests.
Seizure occurrence and participant burden were analyzed.

Main Results:

15 patients were included; 9 (60%) experienced habitual seizures post-TP, confirming FS.
2 patients (13.3%) were diagnosed with epilepsy.
Participants found TP acceptable and not overly burdensome.

Conclusions:

TP shows potential for enhancing diagnostic yield in EEG for FS.
Larger studies are required to validate these findings.
Further research must clarify if provocation is due to TP itself or related factors like suggestion.