Learning a second language is easier for some adults than others, and innate differences in how the various parts of the brain talk to one another may help explain why, according to a recent study in The Journal of Neuroscience.
Led by study author Xiaoqian Chai and Denise Klein, researchers at McGill University explored whether differences in resting-state connectivity relate to performance in a second language.
“These findings have implications for predicting language learning success and failure,” said Chai.
The various regions of our brains communicate with each other even when we are resting and aren’t engaged in any specific tasks. The strength of these connections, called resting-state connectivity, varies from person to person, and differences have previously been linked to differences in behavior including language ability.
Verbal Fluency and Reading Speed
The study involved scanning the brains of 15 adult English speakers who were about to begin an intensive 12-week French course, and then tested their language abilities both before and after the course.
They looked at the strength of connections between various areas in the brain and two specific language regions: an area of the brain implicated in verbal fluency, the left anterior insula/frontal operculum (AI/FO), and an area active in reading, the visual word form area (VWFA).
The researchers tested the participants’ verbal fluency and reading speed both prior to the course and after its completion.
To test verbal fluency, the researchers gave subjects a prompt and asked them to speak for two minutes in French. The researchers counted the number of unique words that were used correctly.
To test reading speed, the researchers had participants read French passages aloud, and they calculated the number of words read per minute.
Connectivity Before Learning
Participants with stronger connections between the left AI/FO and an important region of the brain’s language network called the left superior temporal gyrus showed greater improvement in the speaking test.
Participants with greater connectivity between the VWFA and a different area of the left superior temporal gyrus language area in the left temporal lobe showed greater improvement in reading speed by the end of the 12-week course.
Arturo Hernandez, a neuroscientist at the University of Houston who studies second-language learning and was not involved in the study, said:
“The most interesting part of this finding is that the connectivity between the different areas was observed before learning. This shows that some individuals may have a particular neuronal activity pattern that may lend itself to better learning of a second language.”
However, that doesn’t mean success at a second language is entirely predetermined by the brain’s wiring. The brain is very plastic, meaning that it can be shaped by learning and experience, Chai said.
The study is a first step to understanding individual differences in second language learning, she added.
“In the long term it might help us to develop better methods for helping people to learn better.”