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Updated: Jun 3, 2025
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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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Right-Lateralization of the Visual Word Form Area after Left-Hemisphere Perinatal Stroke
Anna Seydell-Greenwald1, Natalya Vladyko2, Catherine E Chambers2
1Georgetown University Medical Center, Washington, DC 20007 as2266@georgetown.edu.
Summary
The visual word form area (VWFA) typically lateralizes to the left hemisphere. This study shows VWFA lateralization shifts to the right hemisphere when language is right-lateralized due to early stroke.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- The visual word form area (VWFA) is crucial for reading.
- Its strong left-hemisphere lateralization is debated, with theories involving visual features, competition with other visual stimuli, or language system lateralization.
Purpose of the Study:
- To test if VWFA lateralization follows language lateralization.
- To investigate VWFA organization in individuals with right-hemisphere language due to perinatal stroke.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used.
- Participants included individuals with left-hemisphere perinatal stroke and right-hemisphere language, and demographically matched controls.
- fMRI contrasted pseudoword and place picture presentation.
Main Results:
- Controls showed expected left-lateralized VWFA activation.
- Individuals with right-hemisphere language exhibited right-lateralized VWFA activation.
- This occurred even with intact left-hemisphere tissue.
Conclusions:
- VWFA lateralization is dependent on the lateralization of the frontotemporal language system.
- This provides strong evidence that language network organization shapes visual word form processing regions.
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