Bilingualism delays the onset of behavioral but not aphasic forms of frontotemporal dementia

Alladi, Suvarna, Bak, Thomas H., Shailaja, Mekala, Gollahalli, Divyaraj, Rajan, Amulya, Surampudi, Bapiraju, Hornberger, Michael ORCID:, Duggirala, Vasanta, Chaudhuri, Jaydip Ray and Kaul, Subhash (2017) Bilingualism delays the onset of behavioral but not aphasic forms of frontotemporal dementia. Neuropsychologia, 99. 207–212. ISSN 0028-3932

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Bilingualism has been found to delay onset of dementia and this has been attributed to an advantage in executive control in bilinguals. However, the relationship between bilingualism and cognition is complex, with costs as well as benefits to language functions. To further explore the cognitive consequences of bilingualism, the study used Frontotemporal dementia (FTD) syndromes, to examine whether bilingualism modifies the age at onset of behavioural and language variants of Frontotemporal dementia (FTD) differently. Case records of 193 patients presenting with FTD (121 of them bilingual) were examined and the age at onset of the first symptoms were compared between monolinguals and bilinguals. A significant effect of bilingualism delaying the age at onset of dementia was found in behavioural variant FTD (5.7 years) but not in progressive nonfluent aphasia (0.7 years), semantic dementia (0.5 years), corticobasal syndrome (0.4 years), progressive supranuclear palsy (4.3 years) and FTD-motor neuron disease (3 years). On dividing all patients predominantly behavioral and predominantly aphasic groups, age at onset in the bilingual behavioural group (62.6) was over 6 years higher than in the monolingual patients (56.5, p=0.006), while there was no difference in the aphasic FTD group (60.9 vs. 60.6 years, p=0.851). The bilingual effect on age of bvFTD onset was shown independently of other potential confounding factors such as education, gender, occupation, and urban vs rural dwelling of subjects. To conclude, bilingualism delays the age at onset in the behavioral but not in the aphasic variants of FTD. The results are in line with similar findings based on research in stroke and with the current views of the interaction between bilingualism and cognition, pointing to advantages in executive functions and disadvantages in lexical tasks.

Item Type: Article
Uncontrolled Keywords: dementia,frontotemporal dementia,executive function,aphasia,bilingualism
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Mental Health
Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health
Depositing User: Pure Connector
Date Deposited: 30 Mar 2017 00:42
Last Modified: 19 Oct 2023 01:57
DOI: 10.1016/j.neuropsychologia.2017.03.021


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