Thomas Bak helped to organize the study. He is with the Center of Cognitive Aging at the University of Edinburgh in Scotland. He suggests that individuals who speak more than one language train their brains by moving back and forth between different words and expressions.

　　Mr. Bok believes this effort improves what scientists call executive functioning or attention to tasks. This mental ability often weakens in people with dementias.

　　Researchers found there was no extra gain in speaking more than two languages. They also did not see a delay in the first signs of Lewy bodies dementia. The disorder causes patients to see or experience things that do not really exist. It can also cause sufferers to move back and forth between being wide awake and really sleepy.

　　Mr. Bak says it does not appear important whether you learn a language at a young age or later in life.

　　So its not something you sort of say that ) you missed the boat when you do not do it as a baby. It is something that is still quite useful and powerful when you do it as an adult.

　　Scientists found that speaking more than one language helped delay the first signs of dementias even in those who could not read. An article on the benefits of bilingualism on dementias is published in the journal Neurology.

　　Im Milagros Ardin.

　　And Im Jonathan Evans. You are listening to As It Is from VOA Learning English.

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