Cortical surface (ECoG sites)
Gyral recordings for language, motor and seizure mapping.
Darker cells mean a higher score for this topic on that metric.
Research82
Awareness45
Complexity85
Clinical weight75
Plasticity40
Live debate60
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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.
“Anatomy” here is electrode anatomy: grids on gyral surfaces, strips in sulci and depth leads targeting deep nodes like hippocampus or insula.
Signal sources are local field potentials summing synaptic currents — not single spikes unless dedicated microelectrodes are used.
Structures
Hippocampus / MTL (depth)
Common SEEG targets for temporal lobe epilepsy and memory tasks.
Insula
Deep coverage for seizures and interoceptive paradigms.
Sensorimotor cortex
High-gamma mapping of movement and somatotopy.
Language cortex (STG / IFG)
Eloquent-area mapping before resection.
Thalamic / deep nuclei (selected)
Occasional depth targets for network seizures or DBS planning.
Pathways
Local cortical circuits
Primary generators of high-gamma task responses.
Cortico-cortical white matter
Propagates seizures and task-related coherence.
Hippocampal–neocortical loops
Memory encoding dynamics visible on depth leads.
Thalamocortical relays
Contribute to rhythms and some seizure networks.
Landmarks
Grid implantation surgery
Clinical gateway to surface recordings.
SEEG trajectory planning
MRI-guided paths through networks of interest.
Cortical stimulation mapping
Causal probe of language and motor sites.
High-gamma task epochs
Analytic window for cognitive iEEG studies.
Open atlas neighbours: cortex, hippocampus, insula, thalamus.
Sources & research
- Promises and limitations of human intracranial electroencephalographyPromises and limits of human iEEG.DOI
- High-frequency neural activity and human cognition: past, present and possible future of intracranial EEG researchHigh-frequency activity and cognition review.DOI
- High-frequency gamma oscillations and human brain mapping with electrocorticographyHigh-gamma mapping with ECoG.DOI
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