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🔌Intracranial EEG

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

Also called: iEEG · ECoG · stereo-EEG

Intracranial EEG
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Quick facts

invasive signalsFocus
82/100Research
45/100Awareness
85/100Complexity
75/100Clinical
60/100Debate

Intracranial EEG records electrical activity from electrodes on the cortical surface (ECoG) or in depth (stereo-EEG / SEEG). It offers millimetre spatial scale and kilohertz temporal bandwidth unavailable to scalp EEG or fMRI.

Clinically it maps seizure onset and eloquent cortex before epilepsy surgery; scientifically it reveals high-gamma activity tied to cognition. Coverage is sparse and ethical constraints are strict — not a general “brain reading” tool.

Educational neuroscience context only — not medical advice. Intracranial EEG is performed in specialised clinical settings for indicated patients.

mmECoGmillimetre timing
82Researcheditorial band
1950sPenfieldawake mapping teaching history
0OR recipeno OR checklist here

Intracranial EEG — concrete atlas depth on Tool-Lifes.

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Intracranial EEG — concrete atlas depth on Tool-Lifes.

The profile

824585754060
  • Research82
  • Awareness45
  • Complexity85
  • Clinical weight75
  • Plasticity40
  • Live debate60

Seven ways into this topic

Frequently asked questions

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.
What reusable tool sits on brain pages?
Atlas dual-view: pin a cortical label beside a deep structure while you read iEEG limits — teaching, not targeting.
Any number to keep?
Scores are editorial. Clinical sampling density is case-specific in the literature — this site does not publish an OR recipe.

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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