Learning a second language is linked to a more efficient brain network. A research team reports that people who speak two languages show stronger communication between distant brain regions. The effect is clearer when the second language is learned in childhood, when the brain is most flexible.
The study used resting state functional MRI, a scan that tracks how brain areas work together while a person is not doing a task. Results show higher whole brain efficiency in bilinguals, meaning information can move across the brain with fewer steps. This pattern was not limited to language zones. It included stronger links between the cerebellum, the brain region for coordination and timing, and the left frontal cortex, a key region for language and control.
The earlier the second language is learned, the stronger these connections appear to be. This early boost to neuroplasticity, the brain’s ability to change with experience, may support attention, learning, and healthy aging. The findings add to evidence that bilingual experience shapes how the brain is wired.
Communications Biology – Enhanced efficiency in the bilingual brain through the inter-hemispheric cortico-cerebellar pathway in early second language acquisition – 2024
Open access research article reporting that bilinguals show higher global brain efficiency than monolinguals, with earlier second language exposure linked to stronger gains. The effect is driven by increased connectivity between association networks and the cerebellum.
PubMed – Enhanced efficiency in the bilingual brain through the inter-hemispheric cortico-cerebellar pathway in early second language acquisition – 2024
Index record for the same study, outlining the sample, resting state fMRI approach, and the main finding of higher global efficiency in bilinguals with an age of acquisition effect.
McGill University – Bilingualism makes the brain more efficient, especially when learned at a young age – October 11, 2024
University news release explaining the study in plain language, highlighting stronger links between the cerebellum and left frontal cortex, and the greater impact of early second language exposure.
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