Neural signatures of second language proficiency in narrative processing

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• Second language (L2) speech comprehension involves complex cognitive abilities.
• Differences in brain activity are often linked to processing demands, but may also reflect varying neural representations.
• Neural synchronization during naturalistic listening could offer insights into L2 proficiency.

Purpose of the Study:

• To investigate if intersubject neural synchronization during naturalistic narrative comprehension can measure L2 proficiency.
• To identify brain regions associated with different levels of L2 proficiency.
• To determine if neural synchronization patterns can predict behavioral performance in L2 learners.

Main Methods:

• Utilized a searchlight-shared response model to analyze brain activity during narrative comprehension.
• Compared neural synchronization patterns across participants with low, moderate, and high L2 proficiency.
• Classified proficiency levels and predicted behavioral performance based on identified neural synchronization differences.

Main Results:

• Highly proficient L2 learners exhibited synchronization in brain regions similar to native speakers, including the default mode network and lateral prefrontal cortex.
• Low proficiency learners showed greater synchronization in auditory cortex and temporal lobe semantic processing areas.
• Moderate proficiency was associated with the highest neural diversity, indicating less consistent processing strategies.

Conclusions:

• Higher L2 proficiency correlates with more native-like neural processing of naturalistic language.
• Neural synchronization patterns effectively differentiate L2 proficiency levels and generalize to predict behavioral outcomes.
• Proficiency-sensitive neural systems extend beyond traditional cognitive control and core language networks.