An MIT study has unearthed intriguing insights into the brain's handling of multiple languages, revealing that the cognitive machinery of polyglots operates with striking ease when it comes to their mother tongue. Polyglots, individuals proficient in at least five languages, show a unique neural pattern: reduced activity within their language networks when processing their first language, despite all language areas being more active for languages they're better versed in.
Published in the journal Cerebral Cortex, the study marshals evidence suggesting that the native language entails a lower lift for the brain compared to other fluently spoken languages. "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," explained associate professor of neuroscience at MIT, Evelina Fedorenko, as reported by MIT News. This observation bucks the trend seen with languages acquired later in life, where a greater mastery typically correlates to heightened neural response.
Conducted by MIT along with scholars from Harvard University and Carleton University, the research enlisted 34 multilingual volunteers for brain scans as they absorbed texts in varying languages. Despite the initial assumption that the more proficient the language, the higher the brain activity, researchers were taken aback to find a marked downturn in neural exertion when subjects listened to their native languages. This intriguing twist suggests that the familiarity bred over a lifetime of exposure trumps sheer linguistic skill in dictating the brain's workload.
The meticulous design of the study involved participants listening to passages in their native language and several other tongues, ranging from highly proficient to utterly unknown. Scans by functional magnetic resonance imaging (fMRI) illuminated the way the brain's language network wasn't just more receptive to related languages but showed an uptick in engagement relative to completely alien ones. "We’re getting a hint that the response in the language network scales up with how much you understand from the input," Saima Malik-Moraleda, a graduate student at Harvard, elucidated to MIT News.
Furthermore, this polyglot puzzle piece aligns with the role of the brain's multiple demand network, which comes into play for taxing cognitive activities. It appears this network pitches in when grappling with non-native languages, underscoring the additional mental gymnastics required to process less familiar linguistic terrain. Research funding came from the McGovern Institute for Brain Research, MIT's Department of Brain and Cognitive Sciences, and the Simons Center for the Social Brain, reflecting a commitment to advancing our understanding of the cerebral processes underpinning language mastery.
