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Related Experiment Video

Updated: Jul 24, 2026

Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue
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Published on: October 26, 2014

Single-pulse electrical stimulation identifies epileptogenic frontal cortex in the human brain.

A Valentín1, G Alarcón, J J García-Seoane

  • 1Department of Clinical Neurophysiology, Guy's, King's, and St. Thomas' School of Medicine, King's College Hospital, London, UK.

Neurology
|August 10, 2005
PubMed
Summary

Single-pulse electrical stimulation (SPES) effectively identifies frontal epileptogenic zones during epilepsy surgery evaluation. This method aids in localizing seizure origins, especially in complex cases, improving surgical outcomes.

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Area of Science:

  • Neuroscience
  • Epileptology
  • Neurosurgery

Background:

  • Presurgical assessment is crucial for epilepsy surgery planning.
  • Identifying the epileptogenic zone is key to successful surgical outcomes.
  • Frontal lobe epilepsy presents unique diagnostic challenges.

Purpose of the Study:

  • To evaluate the utility of single-pulse electrical stimulation (SPES) in localizing the frontal epileptogenic cortex.
  • To determine if SPES can aid in presurgical assessment for frontal epilepsy.
  • To correlate SPES findings with surgical outcomes.

Main Methods:

  • Single-pulse electrical stimulation (SPES) was applied to 30 patients with intracranial electrodes in the frontal lobes.
  • Patients were categorized into frontal epilepsy (17) and extrafrontal epilepsy (13) groups.
  • Responses to SPES were analyzed, categorizing them into early and late responses (delayed and repetitive).

Main Results:

  • Late responses to SPES, specifically delayed and repetitive responses, were observed in frontal and extrafrontal areas.
  • Frontal late responses were more frequently seen in patients with frontal epilepsy (13/17) and correlated with neuropathologic abnormalities.
  • Resection of abnormal SPES areas in frontal epilepsy patients led to favorable postsurgical seizure control.

Conclusions:

  • Single-pulse electrical stimulation (SPES) is a valuable tool for identifying frontal epileptogenicity during presurgical evaluation.
  • SPES can assist in cases with unclear seizure origins, normal imaging, or limited telemetry data.
  • This technique enhances the localization of epileptogenic cortex, potentially improving surgical planning and outcomes.