Why do some adults learn languages quickly while others struggle?

Why do two people, placed in the same conditions, master a foreign language at completely different speeds? One confidently constructs phrases after just a few lessons, while the other struggles for weeks to memorize the simplest structures. New research by neuroscientists offers an explanation that relates not so much to the classical language centers of the brain as to how large neural networks are organized.

It's not just about the "language" areas of the brain

The study, published in the Journal of Neuroscience, was conducted by Peilun Sun from the Chinese University of Hong Kong and his colleagues. According to the authors, differences in the ability of adults to quickly learn a new language are largely determined by the characteristics of interaction among large-scale functional networks in the brain.

The study involved 101 healthy young adult native Chinese (Mandarin dialect) speakers. On the first day of the experiment, all participants underwent brain scanning while performing a series of language learning tasks. The basis of the program was an artificial language called Brocanto2, specifically created for scientific research. This model allows for the study of the learning process without mixing it with prior experience in real foreign languages.

Seven days of learning under the scientists' supervision

After the first day, participants continued to study daily for another six days. Throughout the week, researchers tracked how successfully they were mastering new material. The final results from the seventh day were used as an indicator of learning effectiveness, and changes in the success of completing individual tasks allowed for the construction of individual learning curves for each participant.

The scientists then compared the data obtained during the initial brain scanning with how the individuals fared in their learning. This comparison revealed several consistent patterns.

Attention and flexibility turned out to be more important than expected

The analysis showed the existence of a distinct overall "neural signature" associated with successful language learning. Notably, key differences were found not in traditional language areas of the brain.

The best results were shown by participants who had higher activity in two large functional networks:

• dorsal attention network;
• frontoparietal network.

Both are involved in processes of attention concentration, goal-directed behavior, flexible problem-solving, and memory work.

The authors suggest that more efficient functioning of these networks helps to quickly identify important information, successfully use feedback to correct errors, and gradually accumulate new language knowledge. Therefore, increased activity in these systems may well explain the higher learning speed.

What was left out of the experiment

At the same time, the researchers emphasize that the experiment lasted only seven days. If the observation period had been significantly longer, regions of the brain responsible for processing the native language would likely have started to play a more noticeable role in mastering the new language.

Future research, in the authors' view, could determine not only this but also examine whether the identified brain characteristics influence how its functioning reorganizes as language practice is accumulated.

Why adults learn at different speeds

The results suggest that at the very early stages of learning a foreign language, individual characteristics of the large neural networks in the brain largely determine how quickly a person will progress.

Source:

Song P., Yang S., Geng S., Gan Z., Wang S., Feng G. (2026). “Multi-network topology underlying individual success in language learning.”Journal of Neuroscience, 46(27), e2205252026. https://doi.org/10.1523/JNEUROSCI.2205-25.2026