The Effect of Code-Switching Experience on the Neural Response Elicited to a Sentential Code Switch.

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Bilingualism Research

Background:

• Codeswitching, the ability of multilinguals to alternate between languages, is common in daily communication.
• Understanding the cognitive mechanisms underlying codeswitching is crucial for explaining language processing in bilingual individuals.
• Previous research suggests potential costs associated with codeswitching, but its impact on early semantic access remains debated.

Purpose of the Study:

• To investigate whether codeswitching during sentence reading impacts early semantic meaning access.
• To determine if the brain's N400 component, an index of meaning access, is affected by language switching.
• To explore how individual codeswitching experience modulates the neural processing of language switches and semantic violations.

Main Methods:

• Event-related potentials (ERPs) were recorded from 24 balanced Spanish-English bilinguals.
• Participants read sentences containing semantic violations, language switches (codeswitches), or both.
• Self-reported frequency of daily codeswitching was used as a covariate in the analysis.

Main Results:

• A significant N400 response was observed for semantic violations, confirming its role in meaning access.
• Codeswitches modulated the left anterior negativity (LAN) and late positive component (LPC), but not the N400.
• Codeswitching experience specifically modulated the LPC, indicating its influence on later processing stages.

Conclusions:

• Early semantic memory access during comprehension is independent of the language of presented words.
• Codeswitching impacts a distinct, later stage of language comprehension compared to initial meaning retrieval.
• The degree of bilinguals' codeswitching experience influences the neural processing of language switching events.