The pattern of brain activity observed in adult bilinguals was similar to what the researchers saw in younger adults. Their better performance appeared to require “less activation in several frontal brain regions linked with effortful processing,” the study said. In other words, the older bilinguals were using their brains more efficiently than the older monolinguals.
“This suggests that neural efficiency may represent a core underlying mechanism of the bilingual task-switching advantage in aging,” the study authors wrote.
In other words: Lifelong bilinguals may have more efficient brains