Neurobiology of Language and Bilingualism

Understanding how the brain produces and comprehends language requires mapping which neural circuits handle meaning, grammar, and sound, and how those systems interact in real time. When a person speaks two languages, the brain must also manage competition between them, making bilingualism a powerful lens for studying cognitive control and the flexibility of language networks. Neuroimaging studies and careful observation of patients with aphasia—language deficits caused by brain injury—have revealed that these functions are not neatly localized but distributed across a dynamic interplay of frontal, temporal, and parietal regions. Open questions center on how semantic memory is organized across languages, why some bilingual speakers recover one language faster than the other after a stroke, and how early versus late language acquisition shapes the underlying neural architecture.

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Keywords

Language ProcessingSemantic MemoryBilingualismNeural BasisCognitive ControlSpeech Comprehension