system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: After waking from a coma or a serious head injury, how do people forget their native language and suddenly speak a new one? Do they need previous experience in that new language?
gpt
Some people might change to another language if the part of their brain which controls the processing of their native language is damaged. Of course they must know the other language before they can speak it; brain damage isn't going to magically teach you another previously unknown language.