Bilingualism is a topic which interests me, and it’s been mentioned on this blog in my entry language and the brain and Caroline and Daniel’s second language acquisition and bilingual language processing. Now Xavier has sent me a link to an excellent article called Tongue-tied: When bilinguals switch languages involuntarily, which mentions case studies that

support the notion that, in bilinguals, specific regions at the front of the left hemisphere act as a language switch.

Fascinating.