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Intracranial EEG · Electrocorticography and depth electrodes — millimetre-scale human recordings that reveal high-frequency dynamics surgery can see.

Reviewed 2026-08·Sources & research·Methodology·Media credits

At a glance
Score intensity

Darker cells mean a higher score for this topic on that metric.

Last reviewed Sources & creditsMedia creditsMethodology

Quick answers

What is intracranial EEG iEEG/ECoG?

Electrodes on or in the brain during clinical mapping — millimetre-scale timing that scalp EEG blurs. Teaching description of published methods.

When did Penfield-era cortical stimulation map speech?

Mid-20th-century Montreal work made awake mapping famous. Modern grids and stereo-EEG continue the classroom story without copying an OR checklist.

Is this a guide to implant surgery or dosing?

No. Educational methods atlas. Not a diagnosis, implant protocol, or medication dose.

What can iEEG resolve that scalp methods smear?

When and where populations engage during perception, speech, memory or movement — at scales scalp EEG averages away.

Research score 82 — a clinic ranking?

No. Editorial 0-100 in this methods field. Compare with EEG, fMRI and MEG neighbours.

Why do overview pages get clicks?

They name ECoG sites and cortical surface mapping early. Keep reading Overview, Anatomy, Function; do not self-schedule a procedure.

Start with this section - People

Wilder Penfield
Intracranial EEGUnited States National Library of Medicine · Public domain · Wikimedia Commons

Eight voices who shaped epilepsy surgery mapping, high-frequency analysis and the ethics of human intracranial recording.

Portraits resolve via Wikimedia when licences allow.

People

01 Wilder Penfield

Wilder Penfield

1891–1976 · Canada

Awake mapping

Pioneer of intraoperative cortical stimulation mapping.

02

Herbert Jasper

1906–1999 · Canada

EEG & epilepsy

Foundational EEG work with Penfield on localisation.

03 ECoG

Jean Gotman

b. 1940s · Canada

iEEG analysis

Computational approaches to intracranial spike and seizure analysis.

04 High-gamma

Nathan Crone

20th–21st c. · USA

High-gamma

Mapped high-frequency gamma as a functional index.

05 iEEG

Jean-Philippe Lachaux

b. 1970s · France

HF activity

Syntheses of high-frequency neural activity in cognition.

06

Josef Parvizi

b. 1960s · Iran/USA

Promises & limits

Articulated promises and limitations of human iEEG.

07

Sabine Kastner

b. 1964 · Germany/USA

Attention systems

Co-author perspective on iEEG in cognitive systems.

08

Itzhak Fried

b. 1940s · Israel/USA

Single units / MTL

Human single-neuron recordings in medial temporal lobe.

Read primary papers before BCI hype summaries.

Sources & research

  1. Promises and limitations of human intracranial electroencephalographyParvizi J; Kastner S · 2018 · Nature NeurosciencePromises and limits of human iEEG.DOI
  2. High-frequency neural activity and human cognition: past, present and possible future of intracranial EEG researchLachaux JP; et al. · 2012 · Progress in NeurobiologyHigh-frequency activity and cognition review.DOI
  3. High-frequency gamma oscillations and human brain mapping with electrocorticographyCrone NE; et al. · 2006 · Progress in Brain ResearchHigh-gamma mapping with ECoG.DOI

Media credits

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