Early setting of grammatical processing in the bilingual brain

Area of Science:

• Neuroscience
• Psycholinguistics
• Cognitive Science

Background:

• The critical period hypothesis for language acquisition remains debated.
• Bilingual individuals with varied ages of acquisition (AOA) and proficiency levels (PL) offer a valuable model for investigating language learning.
• Understanding the neural basis of second language (L2) processing is crucial for psycholinguistics and cognitive neuroscience.

Purpose of the Study:

• To investigate the differential effects of AOA and PL on the neural correlates of grammatical and semantic judgments in bilinguals.
• To explore how AOA and PL modulate brain activity patterns during L2 processing.
• To contribute to the debate on critical periods in language acquisition by examining neural substrates.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
• Italian-German bilingual participants with diverse AOA and PL were recruited.
• Participants underwent tasks assessing grammatical and semantic judgments in their second language.

Main Results:

• Neural activity during semantic judgments was significantly influenced by the proficiency level (PL).
• The age of acquisition (AOA) predominantly affected the cortical representation of grammatical processing.
• Distinct neural substrates were identified for grammatical versus semantic processing, modulated by AOA and PL.

Conclusions:

• Both AOA and PL play a significant role in shaping the neural architecture of second language processing.
• AOA and PL exert differential influences on grammatical and semantic components of L2.
• Findings support a nuanced view of L2 acquisition, highlighting the interplay between learning parameters and neural representation.