The findings suggest that the brains of polyglots take “comparatively little effort when processing their native language.” In other words, their brains need not work very hard to interpret it.

“Something makes it a little bit easier to process -- maybe it’s that you’ve spent more time using that language -- and you get a dip in activity for the native language compared to other languages that you speak proficiently,” said Evelina Fedorenko, Associate Professor of neuroscience at MIT.

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“As you increase proficiency, you can engage in linguistic computations to a greater extent, so you get these progressively stronger responses. But then if you compare a really high-proficiency language and a native language, it may be that the native language is just a little bit easier, possibly because you've had more experience with it,” Fedorenko said.

For the study, the researchers recruited 34 polyglots, each with at least some degree of proficiency in five or more languages but were not bilingual or multilingual from infancy. Sixteen of the participants spoke 10 or more languages, including one who spoke 54 languages with at least some proficiency.

They underwent functional magnetic resonance imaging (fMRI) as they listened to passages read in eight different languages.

The results also showed that polyglots' brain language networks also lit up when they listened to languages that they didn't speak, but could understand.

Further, the multiple-demand network of the brain that becomes active when performing a cognitively demanding task also gets turned on when listening to languages other than one’s native language.

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