A

　　In the early 1950s，researchers found that people scored lower on intelligence tests if they spoke more than one language.Research in the sixties found the opposite.Bilingual people scored higher than monolinguals，people who speak only one language.So which is it?

　　Researchers presented their newest studies last month at a meeting of the American Association for the Advancement of Science.The latest evidence shows that being bilingual does not necessarily make people smarter.But researcher Ellen Bialystok says it probably does make you better at certain skills.

　　Ellen Bialystok said，“Imagine driving down the highway.There're many things that could capture(捕获)your attention and you really need to be able to monitor(监视)all of them.Why would bilingualism make you any better at that？”

　　And the answer，she says，is that bilingual people are often better at controlling their attention—a function called the executive control system.

　　Ms.Bialystok is a psychology professor at York University in Toronto，Canada.She says the best method to measure the executive control system is called the Stroop Test.A person is shown words in different colors.The person has to ignore the word but say the color.The problem is that the words are all names of colors.

　　Ellen Bialystok said，“So you would have the word blue written in red，but you have to say red.But blue is so salient(显著的)，it's just lighting up all these circuits in your brain，and you really want to say blue.So you need a mechanism(机制)to override that so that you can say red.That's the executive control system.”

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