We have long known that Babies recognize their mother’s voice from the womb and who show a preference for their mother tongue a few days after birth. However, now we know a little more thanks to studies neuroimaging studies that have confirmed something we intuited: the brain of a newborn is prepared to recognize foreign languages if it has heard them in the womb during gestation.
The experiment. To reach this conclusion, a team from Sainte-Justine University Hospital in Montreal recruited 60 pregnant women from monolingual French-speaking families. From here they did two different phases: prenatal exposure and brain analysis after birth.
Prenatal exposure. In this case, a group of 39 fetuses was selected and exposed to recordings of a story during the last month of gestation. To do so, the mothers placed headphones on their abdomen so that the fetus could hear the story in its native language, which was French, and also in a foreign language, which was German or Hebrew.
These languages were chosen specifically because their rhythmic and phonological properties are very different from those of French. The second group, of 21 fetuses, acted as a control and did not receive any experimental exposure, hearing only the French of their natural environment, which is what happens in any type of normal pregnancy.
Brain analysis. A few days after birth (between 10 and 78 hours), the brain activity of all these newborns began to be monitored while they listened to the same story in three languages: French, German and Hebrew.
To do this, they used functional near-infrared spectroscopy (fNIRS), a non-invasive technique that measures changes in blood oxygenation in the brain to see which areas are activated.
The results. They were certainly surprising. The brains of newborns reacted almost identically to their native language and the foreign language they had been hearing in the womb. In both cases, an increase in activity was observed in the temporal regions of the left hemisphere, which is a key area for language processing with Broca’s area, among others.
In contrast, when these babies heard the completely new foreign language (the one they had not heard before), their brains showed a different response, with less activation in language areas and more activity in general sound-processing regions.
The conclusion. This finding suggests that the fetal brain not only hears, but “learns” to recognize the patterns of a language, which causes a specialization of the left hemisphere. One of the authors point specifically that “Our results provide evidence that even brief prenatal exposure to a foreign language could make it recognizable to neonates, leading to brain activation patterns similar to those observed when listening to their native language.”
Anne Gallagher, a neuropsychologist at the University of Montreal and lead author of the study, qualifies the concept of “learning”: “We cannot say that babies ‘learn’ a language prenatally. What we can say is that neonates develop a familiarity with one or more languages during gestation, which shapes their brain networks at birth.”
Understand development. These findings reinforce the idea that a newborn’s brain is not a ‘blank slate’, but that the gestational environment contributes a lot to its brain development, since its brain processing begins here to be shaped before birth.
However, experts caution that this study should not be interpreted as a guide for parents to expose their babies to multiple languages in order to make them more intelligent or multilingual. But it does give us an idea of how this important characteristic is developing.
Limitations. The study, while revealing, also has its limitations, such as a relatively small sample size that prevented, for example, directly comparing responses to German versus Hebrew. Still, it shows that even brief, repeated exposure to linguistic stimuli can modify a newborn’s language brain networks, laying the foundation for future development.
Images | Volodymyr Hryshchenko
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