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The large majority of humankind is more or less fluent in 2 or even more languages. This raises the fundamental question how the language network in the brain is organized such that the correct target language is selected at aparticularoccasion. Here we present particular behavioral and functional magnetic resonanceimagingdata showing that bilingual processing leads to languageconflictin thebilingual brain even when the bilinguals' task only required target language knowledge. This finding demonstrates that the bilingualbrain cannot avoid language conflict, because words from the target and nontarget languages become automatically activated during reading.Importantly,stimulus-based languageconflictwas found in brain regions in the LIPC associated with phonological and semantic processing,whereasresponse-based language con whereas flict was only found in the pre-supplementary motor area/anterior cingulate cortex when language conflict leads to response conflicts.

Index terms: event-related functional magnetic resonance imaging, interlingual homographs, lexical decision, pre-supplementary motor area and anterior cingulated, response conflict.

(Adapted from: https://academic.oup.com/cercor/article/18/11/2706/296045)