Journal Article

Protective effect of bilingualism on aging, MCI, and dementia: A community‐based study

Ballal, Divya, Thanissery, Nithin, Bhaskarapillai, Binukumar, Purushothaman, Vandana Valiyaparambath, Anniappan, Aravind Banavaram, Alladi, Suvarna, Shekar, Revathi, Rao, Girish Nagaraja, Paplikar, Avanthi, Arshad, Faheem, Venugopal, Aparna, Varghese, Feba Anna, Hoskeri, Rakshith Maneshwar

2024

Overview

INTRODUCTION Lifelong bilingualism is associated with a delayed age at onset of dementia, but evidence from community‐based studies is limited. We investigated the relationship between bilingualism and the prevalence of cognitive impairment in a linguistically diverse community. METHODS A door‐to‐door community study was conducted from January to December 2021 in urban Bengaluru, India. 1234 individuals aged ≥60 years participated in the study. Participants were diagnosed with no cognitive impairment (NCI), mild cognitive impairment (MCI), or dementia using established diagnostic criteria. RESULTS Dementia prevalence was higher in monolinguals (4.9%) than bilinguals (0.4%) (P = .001). The prevalence of MCI was also higher in monolinguals (8.5%) than bilinguals (5.3%) (P = .001). The study also revealed better cognitive function in bilinguals than monolinguals with NCI, after controlling for confounding variables. DISCUSSION The current study provides significant support for the protective effect of bilingualism on cognitive impairment in an urban community with extensive bilingual interactional contexts in everyday life. Highlights Bilingualism has been demonstrated to protect against dementia and mild cognitive impairment in a linguistically diverse community with extensive code‐switching contexts. Bilingual older individuals had superior baseline cognitive performance compared to monolingual older individuals. Bilingualism was found to have an independent effect on general cognition after adjusting for major social determinants of health in the group without cognitive impairment.

• Publisher: John Wiley & Sons, Inc,John Wiley and Sons Inc
• Subject: ace / Activities of daily living / Age of onset / Aging / Aging - psychology / Bilingual people / Bilingualism / Brain research / Census of Population / Code switching / Cognition / Cognition & reasoning / Cognitive ability / Cognitive Dysfunction - epidemiology / Cognitive Dysfunction - psychology / Cognitive functioning / Cognitive impairment / cognitive reserve / Community / Delayed / Dementia / Dementia - epidemiology / Dementia - prevention & control / Dementia - psychology / Everyday life / Humans / Language diversity / Language proficiency / Monolingualism / Multilingualism / Neuropsychology / Older people / prevalence / Social factors / Social workers / Sociodemographics / Socioeconomic factors / Socioeconomic status / Sociolinguistics / Urban areas