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Lateralization

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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: Nov 9, 2025

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

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Published on: September 20, 2024

Resting-State Functional MRI for Determining Language Lateralization in Children with Drug-Resistant Epilepsy.

N L Phillips^1,2, A S Shatil¹, C Go³

¹From the Neurosciences and Mental Health Program (N.L.P., A.S.S., A.R., E.W.), The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, Ontario, Canada.

AJNR. American Journal of Neuroradiology

|April 9, 2021

Summary

This summary is machine-generated.

Resting-state fMRI shows promise for predicting typical language dominance in children with epilepsy. However, it struggles to accurately identify atypical language lateralization, requiring further research before clinical use.

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

Published on: November 13, 2016

Area of Science:

Neuroimaging
Epilepsy Research
Pediatric Neurology

Background:

Task-based functional MRI (fMRI) is used for language dominance assessment but is challenging for some children.
Task-free resting-state fMRI (rs-fMRI) offers a potential alternative for language lateralization.
This study investigates rs-fMRI's efficacy in children with drug-resistant epilepsy.

Purpose of the Study:

To evaluate the ability of resting-state fMRI to predict language laterality in children with drug-resistant epilepsy.
To compare the concordance of rs-fMRI with various task-based fMRI paradigms.

Main Methods:

Retrospective review of 43 children with drug-resistant epilepsy.
Analysis of resting-state fMRI data using independent component analysis to identify language networks.
Calculation of concordance rates between rs-fMRI and four task-based fMRI language paradigms.

Main Results:

Concordance between rs-fMRI and task-based fMRI ranged from 0.64 to 0.73.
rs-fMRI correctly classified 78%-83% of patients with left-lateralized language dominance.
rs-fMRI demonstrated poor classification accuracy for patients with right or bilateral language dominance.

Conclusions:

Resting-state fMRI shows good accuracy for identifying typical left-hemisphere language dominance in pediatric epilepsy patients.
Current rs-fMRI methods are insufficient for reliably detecting atypical language lateralization in this population.
Further research is needed to validate rs-fMRI for clinical language mapping in pediatric epilepsy surgery evaluations.