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Preface to "Multilingualism: Consequences for the Brain and Mind"For multilinguals, acquiring and processing language is similar to other cognitive skills: they are grounded in mechanisms of sensory processing and motor control (Paradis, 2019). Recent clinical and experimental research on multilingualism have introduced innovative neuroimaging measures and psychological methods that have significantly shed light on what we know (and do not know) about how multiple languages are processed, represented, and controlled in the mind/brain (Schwieter, 2019).Since the 1990s and 2000s, a plethora of behavioral and neurological research has demonstrated that for multilinguals, all languages are active to some degree in the mind, even when only using one.Furthermore, the need for the mind to manage the ongoing competition that arises from this parallel activation has been shown to affect cognition (e.g., executive functioning) (Giovannoli et al., 2020), modify the structure and functioning of the brain (e.g., changes in the areas where language control and executive control overlap) (Costa and Sebastián-Gallés, 2014), and slow the onset or progression of cognitive and neural decline .The goal of "Multilingualism: Consequences for brain and mind" is to bring together state-of-the art papers that examine the cognitive and neurological consequences of multilingualism through an exploration of how two or more languages are processed, represented, and/or controlled in one brain/mind. The included peer-reviewed papers are either theoretically or empirically oriented and present new findings, frameworks, and/or methodologies on how multilingualism affects the brain and mind.