Sensory and brain mechanisms for hearing are developed at 30 weeks of gestational age, and the new study shows that unborn babies are listening to their mothers talk during the last 10 weeks of pregnancy and at birth can demonstrate what they’ve heard.
A new study shows that unborn babies are listening to their mothers talk during the last 10 weeks of pregnancy and at birth can demonstrate what they’ve heard.
“The mother has first dibs on influencing the child’s brain,” said Patricia Kuhl, co-author and co-director of the Institute for Learning & Brain Sciences at the University of Washington. “The vowel sounds in her speech are the loudest units and the fetus locks onto them.”
Previously, researchers had shown that newborns are born ready to learn and begin to discriminate between language sounds within the first months of life, but there was no evidence that language learning had occurred in utero.
“This is the first study that shows fetuses learn prenatally about the particular speech sounds of a mother’s language,” said Christine Moon, lead author and a professor of psychology at Pacific Lutheran University in Tacoma, Wash. “This study moves the measurable result of experience with speech sounds from six months of age to before birth.”
The results will be published in an upcoming issue of the journal Acta Paediatrica.
Forty infants, about 30 hours old and an even mix of girls and boys, were studied in Tacoma and Stockholm, Sweden. While still in the nursery, the babies listened to vowel sounds in their native tongue and in foreign languages.
Their interest in the sounds was captured by how long they sucked on a pacifier that was wired into a computer measuring the babies’ reaction to the sounds. Longer or shorter sucking for unfamiliar or familiar sounds is evidence for learning, because it indicates that infants can differentiate between the sounds heard in utero.
In both countries, the babies at birth sucked longer for the foreign language than they did for their native tongue.
The researchers say that infants are the best learners, and discovering how they soak up information could give insights on lifelong learning. “We want to know what magic they put to work in early childhood that adults cannot,” Kuhl said. “We can’t waste that early curiosity.”
Hugo Lagercrantz, a professor at the Karolinska Institute in Sweden, was another co-author. The study was funded by the National Institutes of Health and Pacific Lutheran University’s S. Erving Severtson Forest Foundation Undergraduate Research Program.
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