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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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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia

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Establishing language laterality: does resting-state functional MRI help?

Sumit Singh¹, Mustafa S M Alhasan², Zhiyue Wang¹

¹1Department of Radiology, UT Southwestern Medical Center, Dallas, Texas; and.

Journal of Neurosurgery. Pediatrics

|March 8, 2023

Summary

This summary is machine-generated.

Resting-state fMRI (rs-fMRI) shows limited ability to determine language dominance in children, with concordance rates of 68-80% compared to task-based fMRI. Therefore, rs-fMRI should not be the sole method for clinical language lateralization.

Keywords:

language lateralization resting-state fMRI surgical technique task-based fMRI

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Area of Science:

Neuroimaging
Pediatric Neurology

Background:

Task-based functional MRI (tb-fMRI) is the standard for pediatric language lateralization in surgical planning.
tb-fMRI can be limited by patient age, language barriers, and developmental delays.
Resting-state fMRI (rs-fMRI) offers a potential alternative for language dominance assessment without active participation.

Purpose of the Study:

To compare the efficacy of rs-fMRI for language lateralization in pediatric patients against the gold standard tb-fMRI.

Main Methods:

Retrospective evaluation of pediatric patients (2019-2021) who underwent both tb-fMRI and rs-fMRI.
Language lateralization determined by specific tasks for tb-fMRI.
rs-fMRI data processed using SPM, FSL, and FreeSurfer; Laterality Index (LI) calculated from independent components (ICs).

Main Results:

25 pediatric patients (age 7-19) included.
Language laterality concordance between tb-fMRI and rs-fMRI ranged from 68% to 80%.
Concordance varied based on LI calculation and subjective visual inspection of activation maps.

Conclusions:

The concordance rates indicate limitations of rs-fMRI for definitive language dominance assessment.
rs-fMRI should not be used as the sole method for clinical language lateralization in pediatric patients.