10. Foreign Accent Syndrome
Foreign accent syndrome is incredibly rare, with only about 100 reported cases since 1907. It is a speech disorder characterized by sudden articulation and intonation that differs from how the person normally speaks. Simply put, the person develops a new accent altogether, even though they’ve never been to another country and would have never been exposed to this accent before. The pronunciation of words and vocabulary undergo drastic changes to the point that it sounds like a foreign accent to the listener, but it is not a true foreign accent.
Many scientists believe that this results from something in the brain since multiple areas are involved with speech. The foreign accent usually presents itself after there has been brain damage of some kind or there has been a psychiatric illness. Treatment involved typically looks to the original cause of the syndrome.