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Clinical Manifestations.

Tanya Dash1, Yves Joanette2, Ana-Inès Ansaldo3,4

  • 1University of Alberta, Edmonton, AB, Canada.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
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Summary
This summary is machine-generated.

Bilingualism and cognitive reserve protect aging brains by preserving cortical thickness in key areas. This study shows how lifelong language learning may shield against age-related brain changes.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Aging Research

Background:

  • Investigates the interplay of bilingualism, cognitive reserve, and brain structure in aging adults.
  • Examines bilingualism's potential to mitigate age-related neural decline.
  • Utilizes established measures for bilingualism and cognitive reserve index (CRIq), controlling for gender.

Purpose of the Study:

  • To determine the relationship between bilingualism, cognitive reserve, and cortical thickness in aging individuals.
  • To explore how bilingualism might preserve brain structure against age-related changes.
  • To elucidate the neural mechanisms underlying cognitive reserve in bilinguals.

Main Methods:

  • Neuroimaging analysis of cortical thickness in 79 bilingual adults (aged 30-79) using FreeSurfer.
  • Partial least squares regression (PLSR) to analyze relationships between age, bilingualism, CRIq, and cortical thickness.
  • Assessment of multiple brain regions, including those involved in cognitive control and language processing.

Main Results:

  • Age-related cortical thinning was observed in specific brain regions (e.g., middle temporal cortex, hippocampus).
  • Cognitive reserve (CRIq) showed a protective effect, preserving cortical thickness in regions related to cognitive control (e.g., insula, thalamus).
  • Bilingualism was associated with preserved cortical thickness in language and executive control areas (e.g., pars opercularis, inferior parietal cortex).

Conclusions:

  • Bilingualism and cognitive reserve significantly contribute to preserving cortical thickness in aging brains.
  • Findings support the neuroprotective role of bilingualism, particularly in language and executive function networks.
  • This research enhances understanding of cognitive reserve mechanisms and their impact on brain aging.