バイリンガルは認知症の発症が○○年遅い？　色んな研究を調べてみた。

「バイリンガリズムは認知症の発症を遅らせることができるか」というテーマについて色んな研究を調べてみました。

認知症・アルツハイマー病とバイリンガル・モノリンガルの関連について調べた際のソース

https://n.neurology.org/content/81/22/1938
Overall, bilingual patients developed dementia 4.5 years later than the monolingual ones

https://pubmed.ncbi.nlm.nih.gov/32036490/
Results showed that bilinguals vs. monolinguals were 1.9 years (95% CI: -0.9, 4.7) and 4.2 (95% CI: 2.0, 6.4) older than monolinguals at the time of dementia and AD diagnosis, respectively. The mean difference between the two subgroups was not significant. There was no significant risk reduction (odds ratio: 0.89; 95% CI: 0.68-1.16) in developing dementia among bilinguals vs. monolinguals.
Studies included 21 (show fig.1)

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5656355/
The findings from the prospective cohort studies state that there is no association between bilingualism and the delay of the onset of AD, while the retrospective studies claim the opposite

https://www.cdc.gov/aging/dementia/index.html
Alzheimer’s disease. This is the most common cause of dementia, accounting for 60 to 80 percent of cases.

https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/expert-answers/benefits-of-being-bilingual/faq-20058048
Possibly.Studies on the connection between bilingualism and a lower risk of Alzheimer’s disease have had conflicting results.
And if you’re interested in learning another language, go for it. However, more research is needed before it’s known whether learning a second language later in life has the same protective effect as might a lifetime of speaking a second language.

https://www.youtube.com/results?search_query=bilingual+dementia
Youtube検索結果

https://youtu.be/MMmOLN5zBLY?t=203
TEDedのビデオ

https://youtu.be/lbLJ5C7lphI?t=34
WEFのビデオ

https://youtu.be/gNN9ZqsNsJE?t=167
Exciting-Englishのビデオ

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Shannon Smith