Language selection in bilinguals: a spatio-temporal analysis of electric brain activity

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Neuroimaging

Background:

• Bilingual language use involves selecting between languages and switching between them.
• The neural basis of language selection—whether language-specific or general cognitive control—remains debated.

Purpose of the Study:

• To investigate whether language selection relies on language-specific mechanisms or general cognitive control processes.
• To compare neural activity during language selection versus task selection in bilingual individuals.

Main Methods:

• Event-related potentials (ERPs) were recorded from bilingual participants during image naming tasks.
• Participants performed tasks in two contexts: a task selection context (TSc) and a language selection context (LSc).
• Source localization estimated brain regions associated with observed ERP differences.

Main Results:

• ERP differences emerged between 220–300 ms after cue presentation, indicating distinct processing for language vs. task selection.
• Language selection (LSc) showed increased activation in left middle frontal-precentral, supramarginal, and angular gyri compared to TSc.
• These areas are implicated in both general cognitive control and language processing.

Conclusions:

• Language selection is supported by a neural network that integrates general cognitive control mechanisms with language-specific processing areas.
• The findings suggest a shared neural substrate for cognitive control that is modulated by language demands in bilinguals.