Enhancement of posterior brain functional networks in bilingual older adults
- Jaisalmer de Frutos-Lucas
- David López Sanz
- Pablo Cuesta
- Ricardo Bruña Fernández
- Sofía de la Fuente
- Noelia Serrano
- María Eugenia López García
- María Luisa Delgado Losada
- Ramón López-Higes Sánchez
- Alberto Marcos
- Fernando Maestú Unturbe
ISSN: 1366-7289
Any de publicació: 2020
Volum: 23
Número: 2
Pàgines: 387-400
Tipus: Article
Altres publicacions en: Bilingualism: Language and cognition
Resum
Bilingualism has been said to improve cognition and even delay the onset of Alzheimer's disease (AD). This research aimed to investigate whether bilingualism leaves a neurophysiological trace even when people are highly educated. We expected bilinguals to present better preserved brain functional networks, which could be a trace of higher cognitive reserve. With this purpose, we conducted a magnetoencephalographic study with a group of healthy older adults. We estimated functional connectivity using phase-locking value and found five clusters in parieto-occipital regions in which bilinguals exhibited greater functional connectivity than monolinguals. These clusters included brain regions typically implicated in language processing. Furthermore, these functional changes correlated with caudate volumes (a key region in language shifting and control) in the bilingual sample. Interestingly, decreased Functional Connectivity between posterior brain regions had already been identified as an indicator of aging/preclinical AD but, according to our study, bilingualism seems to exert the opposite effect.