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Bilinguals are better listeners
Perhaps because they are used to differentiating between two or more languages, studies have shown that all foreign language learners develop on average better listening skills than monolingual peers.
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Bilingualism can help to ward off the mental ageing process
It’s long been understand that actively exercising the brain can ward can help people to remain sharper in old age and lessen the effects of senility. Unsurprisingly, perhaps, bilinguals exercise their brains automatically as they switch from one language to another. According to one study, the onset of dementia was delayed by 4 years in bilinguals compared to monolinguals with dementia. (Paradis, J., Genesee, F., & Crago, M. (2011). Dual Language Development and Disorders: A handbook on bilingualism & second language learning.)
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Bilingual children do better in education
Being bilingual may give children an advantage at school. Bilingual children have been shown to be better than their monolingual peers at focusing on a task while tuning out distractions. This seemingly enhanced ability to concentrate has also been found in bilingual adults, especially those who became fluent in two languages at an early age. It is thought that being able to filter things out when switching language enhances the brain’s ability to focus and ignore irrelevant information.