The effect of lifelong bilingualism on regional grey and white matter volume

DSpace/Manakin Repository

The effect of lifelong bilingualism on regional grey and white matter volume

Citable link to this page


Title: The effect of lifelong bilingualism on regional grey and white matter volume
Author: Olsen, Rosanna K.; Pangelinan, Melissa M.; Bogulski, Cari; Chakravarty, M. Mallar; Luk, Gigi; Grady, Cheryl L.; Bialystok, Ellen

Note: Order does not necessarily reflect citation order of authors.

Citation: Olsen, Rosanna K., Melissa M. Pangelinan, Cari Bogulski, M. Mallar Chakravarty, Gigi Luk, Cheryl L. Grady, and Ellen Bialystok. 2015. “The Effect of Lifelong Bilingualism on Regional Grey and White Matter Volume.” Brain Research 1612 (July): 128–139.
Full Text & Related Files:
Abstract: Lifelong bilingualism is associated with the delayed diagnosis of dementia, suggesting bilingual experience is relevant to brain health in aging. While the effects of bilingualism on cognitive functions across the lifespan are well documented, less is known about the neural substrates underlying differential behavior. It is clear that bilingualism affects brain regions that mediate language abilities and that these regions are at least partially overlapping with those that exhibit age-related decline.
Moreover, the behavioural advantages observed in bilingualism are generally found in executive function performance, suggesting that the frontal lobes may also be sensitive to bilingualism, which exhibit volume reductions with age. The current study investigated structural differences in the brain of lifelong bilingual older adults (n = 14, mean age = 70.4) compared with older monolinguals (n = 14,mean age= 70.6). We employed two analytic approaches: 1) we examined global differences in grey and white matter volumes; and, 2) we examined local differences in volume and cortical thickness of specific regions of interest previously implicated in bilingual/monolingual comparisons (temporal pole) or in aging (entorhinal cortex and hippocampus). We expected bilinguals would exhibit greater volume of the frontal lobe and temporal lobe (grey and white matter), given the importance of these regions in executive and language functions, respectively. We further hypothesized that regions in the medial temporal lobe, which demonstrate early changes in aging and exhibit neural pathology in dementia, would be more preserved in the bilingual group. As predicted, bilinguals exhibit greater frontal lobe white matter compared with monolinguals. Moreover, increasing age was related to decreasing
temporal pole cortical thickness in the monolingual group, but no such relationship was observed for bilinguals. Finally, Stroop task performance was positively correlated with frontal lobe white matter, emphasizing the importance of preserved white matter in maintaining executive function in aging. These results underscore previous findings implicating an association between bilingualism and preserved frontal and temporal lobe function in aging.
Published Version: doi:10.1016/j.brainres.2015.02.034
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at
Citable link to this page:
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)


Search DASH

Advanced Search