Related Experiment Video
Updated: Jan 20, 2026
06:04
Functional Mapping with Simultaneous MEG and EEG
Published on: June 14, 2010
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Electrical stimulation mapping of language with stereo-EEG.
Ravindra Arya1, Brian Ervin2, Jonathan Dudley3
1Comprehensive Epilepsy Center, Division of Neurology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
Epilepsy & Behavior : E&B
|August 19, 2019
Summary
Stereo-EEG electrical stimulation mapping (ESM) reliably identifies language areas, but may miss some sites. A 50-Hz protocol is recommended for accurate language mapping in epilepsy surgery.
Area of Science:
- Neuroscience
- Neurosurgery
- Epileptology
Background:
- Accurate localization of language function is critical for neurosurgical planning, especially in patients with epilepsy.
- Stereo-electroencephalography (stereo-EEG) with electrical stimulation mapping (ESM) is an invasive but precise method for identifying eloquent brain regions.
- Functional magnetic resonance imaging (fMRI) provides non-invasive language mapping, but its accuracy can be limited in certain patient populations.
Purpose of the Study:
- To prospectively validate stereo-EEG ESM for language localization against a meta-analytic fMRI framework (Neurosynth).
- To assess the diagnostic performance of stereo-EEG ESM in identifying language-eloquent cortical sites.
- To determine optimal stimulation parameters and thresholds for language mapping using stereo-EEG.
Main Methods:
- Stereo-EEG ESM was performed in 10 patients using 50 Hz stimulation during a picture naming task.
- Electrode contacts (ECs) were classified as ESM+ if speech/language was affected.
- EC locations were coregistered with pre-surgical MRI and CT scans, then intersected with Neurosynth's 3D language fMRI data.
Main Results:
- Stereo-EEG ESM identified language function in 29% of ECs, demonstrating high specificity (0.87) but moderate sensitivity (0.57) compared to fMRI.
- The diagnostic odds ratio (DOR) for stereo-EEG ESM as a classifier of fMRI language sites was 9.02 (p < 0.0001).
- Language and after-discharge (AD) thresholds were lower for ESM+ sites, decreasing with age and IQ. A 50 Hz stimulation protocol is suggested.
Conclusions:
- Stereo-EEG ESM is a valid tool for identifying brain regions with and without language function, complementing fMRI data.
- While effective, stereo-EEG ESM may not detect all language-related sites, highlighting the need for careful interpretation.
- A 50 Hz stimulation protocol is recommended for optimizing language mapping with stereo-EEG in clinical practice.
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