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Understanding white matter integrity stability for bilinguals on language status and reading performance
Jacqueline Cummine1, Carol A Boliek
1Department of Speech Pathology and Audiology, Faculty of Rehabilitation Medicine, University of Alberta, 2-70 Corbett Hall, T6G 2G4, Edmonton, AB, Canada. jcummine@ualberta.ca
Brain Structure & Function
|October 26, 2012
Summary
White matter integrity in bilinguals and monolinguals was studied using diffusion tensor imaging (DTI). Findings suggest bilinguals may have less stable white matter until adulthood, impacting reading speed and word retrieval.
Area of Science:
- Neuroscience
- Cognitive Science
- Linguistics
Background:
- Diffusion tensor imaging (DTI) studies have explored white matter integrity in bilinguals.
- Previous research has not directly linked structural neural pathways to specific language functions like reading skill.
Purpose of the Study:
- To examine white matter integrity using DTI in monolingual English and bilingual Chinese-English speakers.
- To investigate the relationship between white matter integrity (fractional anisotropy - FA) and reading skill (response times and accuracy).
Main Methods:
- Recruited 11 monolingual and 13 bilingual adults.
- Collected behavioral data on naming regular and exception words.
- Utilized DTI to analyze fractional anisotropy (FA) and mean diffusivity, correlating these with response times.
Main Results:
- Monolinguals showed minimal regions of higher FA compared to bilinguals; no regions showed higher FA for bilinguals.
- Increased FA correlated with faster response times in several brain regions.
- The relationship between FA and response time differed between groups and word types, suggesting varied processing demands.
Conclusions:
- White matter integrity may not fully stabilize in bilingual individuals until late adulthood.
- Findings support hypotheses regarding interference control and reduced word frequency in bilingual language processing.
- This study advances understanding of neural networks underlying language status and reading proficiency in adults.
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