Experience, as the old saying goes, is the best teacher. And experience seems to play an important early role in how infants learn to understand and produce language.

Using new technology that measures the magnetic field generated by the activation of neurons in the brain, researchers tracked what appears to be a link between the listening and speaking areas of the brain in newborn, 6-month-old and one-year-old infants, before infants can speak.

The study, which appears in this month’s issue of the journal NeuroReport, shows that Broca’s area, located in the front of the left hemisphere of the brain, is gradually activated during an infant’s initial year of life, according to Toshiaki Imada, lead author of the paper and a research professor at the University of Washington’s Institute for Brain and Learning Sciences.

Broca’s area has long been identified as the seat of speech production and, more recently, as that of social cognition and is critical to language and reading, according to Patricia Kuhl, co-author of the study and co-director of the UW’s Institute for Brain and Learning Sciences…

Kuhl said there is a long history of a link in the adult brain between the areas responsible for understanding and those responsible for speaking language. The link allows children to mimic the speech patterns they hear when they are very young. That’s why people from Brooklyn speak “Brooklynese,” she said.

“We think the connection between perception and production of speech gets formed by experience, and we are trying to determine when and how babies do it,” said Kuhl, who also is a professor of speech and hearing sciences…

“We think that early in development babies need to play with sounds, just as they play with their hands. And that helps them map relationships between sounds with the movements of their mouth and tongue,” she said. “To master a skill, babies have to play and practice just as they later will in learning how to throw a baseball or ride a bike. Babies form brain connections by listening to themselves and linking what they hear to what they did to cause the sounds. Eventually they will use this skill to mimic speakers in their environments.”

This playing with language starts, Kuhl said, when babies begin cooing around 12 weeks of age and begin babbling around seven months of age.

“They are cooing and babbling before they know how to link their mouth and tongue movements. This brain connection between perception and production requires experience,” she said…

Source: PHYSORG.COM
http://www.physorg.com/news71809173.html