Two languages = two speech centers! It doesn't matter to our
brain when we learn a language. This is because it has different
storage areas for different languages. Not all the languages we
learn are stored together. Languages we learn as adults have
their own storage area. That means the brain processes the new
rules in a different place. They aren't stored with the native
language. People who grow up bilingual, on the other hand, only
use one region of the brain. Multiple studies have come to this
conclusion. Neuroscientists examined various test subjects.
These subjects spoke two languages fluently. One part of the
test group, however, had grown up with both languages. The other
part, in contrast, had learned the second language later in
life. Researchers could measure brain activity during language
tests. This way they could see which areas of the brain
functioned during the tests. And they saw that the "late"
learners had two speech centers! Researchers had already long
suspected that this would be so. P