An fMRI study with semantic access in low proficiency second language learners

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• Bilingualism research explores the neural basis of language processing.
• Understanding second language (L2) acquisition in children is crucial.
• The existence of distinct or shared neural systems for native (L1) and L2 remains debated, especially at low proficiency levels.

Purpose of the Study:

• To investigate whether a common or distinct neural semantic system exists for L1 and L2 in low-proficiency bilingual children.
• To examine brain activity patterns during semantic processing in both languages.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Twelve 10- to 12-year-old Chinese children with early English L2 acquisition (age 8) participated.
• A semantic decision task was administered during fMRI scanning.

Main Results:

• Subjects demonstrated robust activation in semantic processing areas (e.g., left inferior frontal cortex) for both L1 and L2.
• No significant differences were found in activation patterns between L1 and L2 within-subject or group analyses.
• Performance in the L2 semantic task was lower than in L1.

Conclusions:

• Shared neural substrates support semantic processing for both native and second languages at the single-word level.
• These findings suggest a common neural semantic system for L1 and L2, even in individuals with very low L2 proficiency.
• The study provides evidence for neural overlap in language processing in early bilinguals.