For over a century, scientists believed language was handled by a few key areas in the left hemisphere of the brain. A new study published in the Journal of Neuroscience reveals that language processing actually involves a much broader network — 17 additional regions scattered across the cerebellum, hippocampus, amygdala, and cerebral cortex.
Led by MIT associate professor Evelina Fedorenko and lead author Agata Wolna, the research team analyzed task-based fMRI data from 772 participants collected over a decade. Each subject completed a “language localizer” task: listening or reading real sentences versus meaningless nonwords. The team used adjusted statistical thresholds to detect subtle neural signals that previous studies routinely filtered out. This approach unveiled 17 new language-active sites outside the classic left-hemisphere network.
These newly identified nodes account for only about 5% of adult brain volume — roughly the size of a large strawberry. “Even though there are all these distant components, it’s pretty restricted in terms of volume. You don’t need that much of the brain to do language,” Fedorenko said.
Five of the new sites reside in the cerebellum, a structure traditionally associated with motor control. Three of those cerebellar regions appear to multitask, activating for both language and non-linguistic tasks like spatial working memory — suggesting they serve as integration hubs between different cognitive systems. The remaining nodes span the medial frontal cortex, the left temporal lobe, the amygdala, and the hippocampus.
Why It Matters
These findings reshape our understanding of how the brain organizes language. They show that language processing is not an isolated function but draws on regions involved in memory, emotion, and motor coordination. For cognitive health, this suggests that maintaining language abilities may involve supporting a wide network of brain regions. Interventions that boost overall brain health — like physical exercise, learning new skills, and social engagement — could help preserve this distributed language network.
What You Can Do
To keep your language networks strong, engage in activities that challenge different cognitive domains: reading complex texts, learning a new language, playing memory games, or practicing coordination tasks like dancing or playing an instrument. These stimulate the interconnected regions identified in the study.
Source: Neuroscience News
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