Bilinguals Reportedly Have Better Mental Flexibility

"If you look at bilinguals there seems to be some kind of mechanistic control," said Jason W. Gullifer, a graduate student in psychology, suggesting that both languages are active at the same time.

The research was done on two sets of bilingual English and Spanish speakers. They found that, "Bilinguals rarely say a word in the unintended language, which suggests that they have the ability to control the parallel activity of both languages and ultimately select the intended language without needing to consciously think about it," according to a press release by the university.