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Lateralization

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Related Experiment Video

Updated: Mar 17, 2026

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization

Published on: September 20, 2024

Resting-State Functional MR Imaging for Determining Language Laterality in Intractable Epilepsy.

Matthew N DeSalvo¹, Naoaki Tanaka¹, Linda Douw¹

¹From the Athinoula A. Martinos Center for Biomedical Imaging, 149 Thirteenth St, Suite 2301, Charlestown, MA 02129 (M.N.D., N.T., L.D., D.N.G., S.M.S.); and Departments of Neurology (C.L.L.) and Radiology (B.R.B., S.M.S.), Massachusetts General Hospital, Boston, Mass.

|July 29, 2016

Summary

This summary is machine-generated.

Resting-state functional MRI accurately determines language dominance in epilepsy patients, matching the gold standard intracarotid amobarbital procedure with 96% accuracy. This non-invasive imaging method aids surgical planning for intractable focal epilepsies.

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Area of Science:

Neuroimaging
Epileptology
Neurology

Background:

Medically intractable focal epilepsies often require surgical intervention.
Accurate presurgical mapping of language dominance is crucial to avoid postoperative deficits.
The intracarotid amobarbital procedure (IAP) is the established method for determining language dominance.

Purpose of the Study:

To evaluate the accuracy of resting-state functional magnetic resonance imaging (fMRI) in assessing hemispheric language dominance.
To compare resting-state fMRI findings with the results of the intracarotid amobarbital procedure (IAP).

Main Methods:

Retrospective analysis of 23 epilepsy patients who underwent both IAP and resting-state fMRI.
Language dominance determined using a laterality index (LI) calculated from fMRI data via independent component analysis.
Accuracy, sensitivity, and specificity assessed against IAP results using cross-validation.

Main Results:

Resting-state fMRI demonstrated high concordance with IAP, achieving 96% accuracy, sensitivity, and specificity.
Language component maps from fMRI showed typical language areas in normally lateralized patients and included non-classical areas in atypically lateralized patients.
Spatial maps qualitatively supported the quantitative findings of language dominance.

Conclusions:

Resting-state fMRI is a reliable and accurate tool for measuring language laterality in patients with medically intractable focal epilepsy.
This non-invasive technique offers a viable alternative or adjunct to IAP for presurgical language mapping.
Findings support the integration of resting-state fMRI into presurgical evaluation protocols for epilepsy surgery.