Language processing in the brain is heavily lateralized, typically to the left hemisphere.

“For left-handers, people that naturally write with their left hand and always did, language is still mostly in the left side of the brain, but it's also found more often in the right side of the brain. So it's not as lateralized as we say, it's kind of distributed between both.”

“In people who are left-handed, it still turns out that the vast majority of people have language on the left side, but it's not 99%, it's more like 70%. So if you're left-handed, it's still more likely that the language part of your brain is going to be on the left side, but there's going to be a greater proportion, maybe 20, 30%, where it's either in both hemispheres or on the right side.”

“One thing that I learned about language and the neural circuits underlying language is that it's heavily lateralized, that these structures, Broca's and Wernicke's and other structures in the brain responsible for speech and comprehension of speech sit mainly on one side of the brain, but they do not have a mirror representation or another equivalent area on the opposite side of the brain.”

“So for people who are right-handed, 99% of the time, the language part of the brain is on the left side.”