

When we look at babies, the first thought that comes to mind might be how cute they are and how new they are to the world. However, one aspect we often overlook is how babies think, process information, and perceive their surroundings. Patricia Kull delves into how babies are linguistic geniuses, as they have the ability to acquire a second language extremely quickly until the age of seven. After puberty, we observe a sharper decline to the point where it completely disappears. She mentions that there is a critical period in development, where babies attempt to master the sounds in a language. The fascinating thing about babies is that they can discriminate the sounds of every language, regardless of which country it is from, which is something adults cannot do. Because adults are culture-bound listeners, they can only differentiate the sounds of their primary language, not foreign ones.
Kuhl explains further that they were able to pinpoint when babies become culture-bound listeners, as a study was conducted with babies in Tokyo and the United States, in which they listened to “ra” and “la”—sounds, which are important in English but not in Japanese. It was found that at around six to eight months, the babies were completely equivalent in ability to discriminate between these two sounds. However, only two months later, the babies in the U.S. got significantly better, and the babies in Tokyo got significantly worse. This signified that the babies were preparing for the exact language that they were going to learn in such a short span of time.
Additionally, to provide us with an understanding of how babies can perceive another language, Kuhl explains another study conducted in which they compared Taiwanese babies’ understanding of Mandarin to 6-month-old American babies (who had never heard a second language before) who were exposed to Mandarin through twelve sessions. It was found that after two months, the American babies were just as good at perceiving Mandarin as the Taiwanese babies who had been listening to Mandarin for the past 10 and a half months.
Through both of these studies, scientists were able to figure out two things: babies are listening intently to us, and they are taking statistics while doing so. They can absorb the statistics of which language they are learning, and this changes the way their brains perceive language. The way we perceive language is founded on the representations that were formed extremely early in development.
If you want to watch the full Ted Talk, click here!
Alexandra Lagaros
UConn KIDS Research Assistant