Ellen Bialystok explains the bilingual advantage

In a recent interview with the New York Times, Ellen Bialystok explained how she developed her research on the advantages of bilingualism.

She explained that 'We found that if you gave 5- and 6-year-olds language problems to solve, monolingual and bilingual children knew, pretty much, the same amount of language. But on one question, there was a difference. We asked all the children if a certain illogical sentence was grammatically correct: “Apples grow on noses.” The monolingual children couldn’t answer. They’d say, “That’s silly” and they’d stall. But the bilingual children would say, in their own words, “It’s silly, but it’s grammatically correct.” The bilinguals, we found, manifested a cognitive system with the ability to attend to important information and ignore the less important. She explains the importance of this initial finding in the following way 'There’s a system in your brain, the executive control system. It’s a general manager. Its job is to keep you focused on what is relevant, while ignoring distractions. It’s what makes it possible for you to hold two different things in your mind at one time and switch between them. If you have two languages and you use them regularly, the way the brain’s networks work is that every time you speak, both languages pop up and the executive control system has to sort through everything and attend to what’s relevant in the moment. Therefore the bilinguals use that system more, and it’s that regular use that makes that system more efficient.

Two benefits of this are that normally aging bilinguals have better cognitive functioning than normally aging monolinguals and a more recent finding is that bilinguals showed Alzheimer’s symptoms five or six years later than those who spoke only one language.