In the experiment, David Lewkowicz tested nearly 180 babies, groups of them at ages 4, 6, 8, 10 and 12 montths. How? They showed videos of a woman speaking in English or Spanish to babies of English speakers. A device tracked where each baby was focusing his or her gaze and recorded how long the gaze lasted.
They found a dramatic shift in attention: When the speaker used English, the 4month olds gazed mostly into her eyes. The 6 month olds spent equal amounts of time looking at the eyes and the mouth. The 8 and 10 month olds studied mostly the mouth. At 12 months, attention started shifting back toward the speaker's eyes.
It makes sense that at 6 months, babies begin observing lip movement, Lewkowicz says, because that's about the time babies' brains gain the ability to control their attention rather than automatically look toward noise.
But what happened when these babies used to English heard Spanish? The 12 month olds studied the mouth longer, just like younger babies. They needed the extra information to decipher (破译)the unfamiliar sounds.
“It's a pretty interesting finding,” says University of Iowa psychology professor Bob McMurray, who also studies baby speech development. The babies “know what they need to know about, and they're able to draw their attention to what's important at that point in language development.”
12. Which of the following is the best title of the passage?
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