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Brain signal complexity increases with development and is associated with better cognitive outcomes in older age. Research has also shown that bilinguals are able to stave off cognitive decline for longer periods of time than monolinguals, but no studies to date have examined whether bilinguals have more complex brain signals than monolinguals. Here we explored the hypothesis that bilingualism leads to greater brain signal complexity by examining multiscale entropy (MSE) in monolingual and bilingual young adults while EEG was recorded during a task-switching paradigm. Results revealed that bilinguals had greater brain signal complexity than monolinguals in occipital regions. Furthermore, bilinguals performed better with increasing occipital brain signal complexity, whereas monolinguals relied on coupling with frontal regions to demonstrate gains in performance. These findings are discussed in terms of how a lifetime of experience with a second language leads to more automatic and efficient processing of stimuli and how these adaptations could contribute to the prevention of cognitive decline in older age.
Fluoride exposures have not been established for pregnant women who live in regions with and without community water fluoridation.
The effect of language context on bilingual language control has been widely studied, but research examining how these contexts affect executive control is relatively limited. In the present study, we used EEG to examine how language context in production influences executive control in bilinguals. A single group of unbalanced Chinese-English bilinguals completed a modified Flanker task interleaved with a picture-naming task, such that executive control performance was measured in three contexts: Chinese, English, and mixed-language. Event-related potentials (ERPs) revealed larger N2 amplitudes and smaller P3 and LPC (late positive component) amplitudes for the mixed-language context than the single-language context across both congruent and incongruent trials. Moreover, during the language production task, LPC amplitudes in mixed-language context were smaller than in the single-language contexts. These findings suggest that language contexts modulate both bilingual language control and domain-general executive control.
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