At first, baby's brain is an empty slate.
"The newborn can differentiate all the sounds of all languages," says Kuhl.
But what if the infant hears two languages, at home or in programs like this one?
It turns out the baby responds to both, but each one goes into a different part of the brain.
"The baby brain is mapping two different sets of circuitry," says Kuhl. "One is for the first language, one for the second language."
And the studies show that the ability to switch from one brain section to another allows some babies actually to perform better at certain tasks — mental dexterity brought on by a bilingual world.
But by the time they're 6 months old, most babies respond only to the sounds they hear repeatedly from parents and others — usually just one language.
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