A lot of research now shows the regular, high­level use of more than one language may actually improve early brain development. Knowing two or more languages can improve the ability to focus, decide and deal with information better. These important skills are grouped together, known in brain terms as “executive function”. The research suggests they develop ahead of time in bilingual children, and are already evident in kids as young as 3 or 4. Bilingual education, common in many countries, is a growing trend across the United States, with 440 elementary schools offering the study in Spanish, Chinese and French.

　　But Tamar Gollan, a professor at the University of California, has found a vocabulary gap between children who speak only one language and those who grow up with more. On average, the more language spoken, the smaller the vocabulary in each one. Gollan's research suggests that while that gap narrows as children grow, it does not disappear completely. Gollan says, “Vocabulary tests help us find that bilinguals have the disadvantage, where you know the word but you just can't get it out.”

　　In fact, some of the values of bilingualism can't be measured at all, of course. To speak more than one language is to open the mind to more than one culture or way of life.

　　Bilinguals also appear to be better at learning other new languages. Clarisse spent her early childhood in Switzerland speaking French. At 6, she learned English. Later she learned Spanish, German, and, during three years living in Tokyo, Japanese. Now she has easily mastered several languages.

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