Apparently it doesn't take them too long to absorb the movements that match basic sounds. By their first birthdays, babies start changing back to look you in the eye again. It offers more evidence that quality face­time with babies is very important for speech development more than, say, turning on the latest baby DVD.

　　But Lewkowicz went a step further. He and his student Amy Hansen­Tift tested nearly 180 babies, groups of them at ages 4, 6, 8, 10 and 12 months. How? They showed videos of a woman speaking in English or Spanish to babies of English speakers. They found that when the speaker used English, the 4­month­olds gazed mostly into her eyes. The 6­month­olds spent equal amounts of time looking at the eyes and the mouth. The 8­ and 10­month­olds studied mostly the mouth. At 12 months, attention started changing back toward the speaker's eyes.

　　But what happened when these babies accustomed to English heard Spanish? The 12­month­olds studied the mouth longer, just like younger babies. They needed the extra information to recognize the unfamiliar sounds. That fits with research into bilingualism (双语)that shows babies' brains adjust themselves to distinguishing the sounds of their native language over other languages in the first year of life.

　　The continued lip­reading shows the 1­year­olds clearly still are fit for learning. Babies are so hard to study that this is “a fairly heroic data set”， says Duke University cognitive neuroscientist Greg Appelbaum, who found the research so fascinating that he wants to know more.

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