Skip to content Skip to a section

🔌Frontiers

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 - Frontiers

Open questions include closed-loop seizure control, safer coverage, multimodal fusion and honest limits on decoding private cognition.

BCI hype is loud; clinical ethics and sparse sampling remain the governors.

Open questions

Closed-loop seizure abort

Which biomarkers trigger useful stimulation in time?

Coverage vs risk

Can we sample more networks without raising harm?

Pathology vs “normal”

How much do epileptic dynamics distort cognitive maps?

Decoding ethics

Where is the line between task decoding and privacy?

Multimodal fusion

Best practices for fMRI + iEEG joint inference?

Technology

Responsive neurostimulation

Detect-and-stimulate platforms in epilepsy care.

Flexible high-density ECoG

Denser surface sampling with biocompatible films.

Real-time high-gamma dashboards

Intraoperative and bedside functional maps.

ML seizure forecasting

Needs rigorous prospective validation.

Hybrid optical / electrical probes

Experimental multimodal depth sensing.

Ethics

Consent under illness pressure

Research add-ons must never coerce surgical patients.

Data stewardship

iEEG is identifiable neural data — protect fiercely.

Hype vs clinical benefit

Consumer BCI stories must not distort surgical realities.

Prefer mechanisms and patient benefit over implant marketing.

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

Keep exploring

More in Methods