Seizure onset localisation
Identify regions that start clinical seizures.
Functionally, iEEG resolves when and where populations engage during perception, speech, memory and movement — at scales scalp methods blur.
Network percentages below are editorial teaching emphasis for typical research foci, not universal coverage statistics.
Processes
Eloquent cortex mapping
Protect language and motor areas before resection.
High-gamma task tracking
Index local engagement during cognitive events.
Oscillatory coupling analysis
Phase–amplitude and coherence across sites.
Closed-loop stimulation research
Trigger pulses from detected states — experimental/clinical.
Decoding for BCI research
Limited, supervised intention decoding near motor sites.
Networks
Sensorimotor high-gamma92
Language cortex dynamics78
Medial temporal memory70
Frontoparietal task control55
Default / unsampled cortex30
Sensorimotor high-gamma
Movement and somatotopic mapping staple.
Language cortex dynamics
Speech perception and production mapping.
Medial temporal memory
Encoding/retrieval on hippocampal depth leads.
Frontoparietal task control
Sampled when grids/depths reach control hubs.
Default / unsampled cortex
Large territories often lack electrodes entirely.
Examples
Finger-tapping high-gamma map
Localise hand motor cortex before resection.
Auditory sentence listening
STG electrodes track speech envelope and phonemes.
Memory encoding in MTL
Depth contacts show item-related high-frequency bursts.
Seizure onset pattern reading
Clinical teams identify ictal onset zones.
Compare with EEG, MEG and fMRI method pages for complementary trade-offs.
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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