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Updated: Dec 20, 2025

Examining Bilingual Language Control Using the Stroop Task
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Does bilingualism protect against dementia? A meta-analysis.

John A E Anderson1, Kornelia Hawrylewicz2, John G Grundy3

  • 1Centre for Addiction and Mental Health, Kimel Imaging and Genetics Laboratory, Toronto, ON, Canada. johnaeanderson@gmail.com.

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Summary

Bilingualism may delay the onset of Alzheimer's disease symptoms but does not prevent its occurrence. This study clarifies the impact of bilingualism on Alzheimer's disease progression.

Keywords:
Alzheimer’s diseaseBilingualismDementiaMeta-analysis

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Gerontology

Background:

  • Bilingualism is hypothesized to enhance neuroplasticity and cognitive reserve.
  • The protective effect of bilingualism against Alzheimer's disease (AD) is debated.
  • Discrepancies may arise from conflating dementia incidence and age of onset, alongside methodological issues.

Purpose of the Study:

  • To conduct a comprehensive meta-analysis on bilingualism and Alzheimer's disease.
  • To differentiate the effects of bilingualism on AD symptom onset versus disease incidence.
  • To address statistical and methodological limitations in existing research.

Main Methods:

  • Meta-analysis of retrospective and prospective studies.
  • Inclusion of data on both age of onset and incidence rates of Alzheimer's disease.
  • Analysis to control for socioeconomic status, education, and publication bias.

Main Results:

  • Bilingualism showed a moderate protective effect on the age of onset of Alzheimer's disease symptoms (Cohen's d = 0.32).
  • Weaker evidence indicated bilingualism does not prevent Alzheimer's disease incidence (Cohen's d = 0.10).
  • Results were not explained by socioeconomic status, education, or publication bias.

Conclusions:

  • Bilingualism contributes to cognitive reserve, offering protection against Alzheimer's disease.
  • The primary benefit appears to be delaying symptom onset rather than preventing the disease.
  • Future studies should report both age of onset and incidence rates for Alzheimer's disease.