Unraveling how children become bilingual so easily

Baby brains offer clues to learning new language

By Lauran Neergaard, AP Medical Writer
On 3:01 pm EDT, Monday July 20, 2009

WASHINGTON (AP) -- The best time to learn a foreign language: Between birth and age 7. Missed that window?

New research is showing just how children's brains can become bilingual so easily, findings that scientists hope eventually could help the rest of us learn a new language a bit easier.

"We think the magic that kids apply to this learning situation, some of the principles, can be imported into learning programs for adults," says Dr. Patricia Kuhl of the University of Washington, who is part of an international team now trying to turn those lessons into more teachable technology.

Each language uses a unique set of sounds. Scientists now know babies are born with the ability to distinguish all of them, but that ability starts weakening even before they start talking, by the first birthday.

Kuhl offers an example: Japanese doesn't distinguish between the "L" and "R" sounds of English -- "rake" and "lake" would sound the same. Her team proved that a 7-month-old in Tokyo and a 7-month-old in Seattle respond equally well to those different sounds. But by 11 months, the Japanese infant had lost a lot of that ability.

Wait a minute -- how do you test a baby? By tracking eye gaze. Make a fun toy appear on one side or the other whenever there's a particular sound. The baby quickly learns to look on that side whenever he or she hears a brand-new but similar sound. Noninvasive brain scans document how the brain is processing and imprinting language.

Mastering your dominant language gets in the way of learning a second, less familiar one, Kuhl's research suggests. The brain tunes out sounds that don't fit. (read more)