Speaking 2 languages may have some disadvantages

Advantages of speaking a second language are obvious: easier logistics when traveling, wider access to great literature and, of course, more people to talk with. Some studies have also pointed to the idea that polyglots have stronger executive functioning skills, brain abilities such as switching between tasks and ignoring distractions.

But a large study of bilingual children in the U.S. finds scant evidence of those extra bilingual brain benefits. Bilingual children performed no better in tests measuring such thinking skills than children who knew just one language, researchers report May 20 in Nature Human Behaviour.

Source: Being bilingual is great. But it may not boost some brain functions

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