Language-switch Costs from Comprehension to Production Might Just Be Task-switch Costs

Area of Science:

• Psycholinguistics
• Cognitive Neuroscience
• Bilingualism Research

Background:

• Investigating language switching costs in bilingual individuals is crucial for understanding cognitive control.
• Previous research often assumes language switch costs are consistent across different task types and language modalities.

Purpose of the Study:

• To examine whether language switching costs differ between production-production and comprehension-production tasks in Spanish-English bilinguals.
• To determine if task intention influences the presence or absence of language switch costs.
• To explore the role of language proficiency (balanced vs. unbalanced bilingualism) in language control.

Main Methods:

• Participants performed picture-naming tasks (production) and either reading-aloud (production) or semantic classification (comprehension) tasks.
• Language switching was manipulated between tasks, and reaction times were measured.
• Overt language switching in speech was monitored.

Main Results:

• No language switch costs were observed in picture naming when switching from reading-aloud, despite overt language switching.
• Switch costs appeared in the dominant language and switch facilitation in the nondominant language when switching from semantic classification to picture naming.
• These effects were more pronounced in unbalanced bilinguals.

Conclusions:

• Language switching between comprehension and production can be cost-free when task intention is consistent.
• Language control mechanisms, including inhibition of the nontarget language, are selectively recruited based on task demands, particularly in unbalanced bilinguals.
• The findings challenge the assumption that language switch costs universally transfer between language comprehension and production.