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Bilingualism contributes to reserve and working memory efficiency: Evidence from structural and functional
John A E Anderson1, John G Grundy2, Cheryl L Grady3
1Carleton University, Departments of Cognitive Science and Psychology, Canada.
Neuropsychologia
|October 29, 2021
Summary
Bilingual older adults show enhanced working memory and brain reserve, despite some brain structure differences. This suggests bilingualism may protect cognitive functions in aging.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Aging Research
Background:
- Cognitive decline is common in older adults.
- Bilingualism's impact on cognitive reserve is an area of active research.
- Understanding how bilingualism affects brain structure and function in aging is crucial.
Purpose of the Study:
- To compare brain and behavioral outcomes in monolingual and bilingual older adults.
- To investigate the effects of bilingualism on working memory, item, and associative recognition.
- To explore the relationship between brain structure, aging, and cognitive performance in bilinguals.
Main Methods:
- Participants: Monolingual and bilingual older adults with no reported cognitive issues.
- Cognitive Tasks: n-back for working memory, item and associative recognition tasks.
- Neuroimaging: Assessed gray matter volume, white matter integrity (fractional anisotropy).
Main Results:
- Bilinguals were faster on the two-back working memory task but used frontostriatal regions less.
- No group differences were found in item/associative recognition.
- Bilinguals showed generally lower gray matter volume and white matter integrity, but enhanced integrity in specific regions (superior corona radiata, inferior temporal gyrus).
Conclusions:
- Bilingualism may confer cognitive reserve in older adults.
- Specific brain regions in bilinguals may support executive functions despite overall brain atrophy.
- Brain structure improvements in bilinguals correlated with enhanced cognitive performance, suggesting a protective effect of bilingualism.
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