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What learning more than 2 languages does to your brain?

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I am fluent in English, and I am currently learning how to speak/write Vietnamese (my home language and being taught by my parents), and Japanese (not much purpose for wanting to learn them but I want to anyways). I am planning to learn Spanish (because Spanish is the second most spoken language in the US and can be important in everyday things, too). I am currently taking Japanese in high school as a sophomore, and I am planning to take Spanish next year in high school.

Is it possible that learning three or more different languages at the same time can slow down your brain? Does the brain actually have its limit to keep its memory? But most of all, what does it do to my brain if I am learning many different languages at the same time? Does it get strengthened?