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Demographic Effects on Longitudinal Semantic Processing, Working Memory, and Cognitive Speed.

Jet M J Vonk1,2, Eve Higby3,4, Alexandre Nikolaev5,6

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Summary
This summary is machine-generated.

Aging impacts language and cognitive abilities differently. While education benefits some skills, it does not slow the rate of age-related decline in these domains over time.

Keywords:
AgingCognitionFactor analysisLanguageTrajectory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Understanding how aging affects language and cognitive abilities is crucial for maintaining quality of life in older adults.
  • Investigating the roles of education and age-related changes across different cognitive and language domains provides insights into brain health.
  • Previous research suggests varying impacts of aging and education on cognitive functions, but domain-specific longitudinal data is limited.

Purpose of the Study:

  • To compare the effects of aging and education on distinct language and cognitive domains.
  • To determine if language and cognitive domains exhibit similar age-related change patterns over time.
  • To examine whether education moderates the rate of decline in these domains.

Main Methods:

  • Analysis of longitudinal data from 306 older adults (aged 55-85 at baseline) with a 4-8 year follow-up.
  • Exploratory and confirmatory factor analyses to identify and assess language and cognitive domains.
  • Mixed linear models to analyze longitudinal changes and the moderating effect of education.

Main Results:

  • Identified semantic control, semantic memory efficiency (language), working memory, and cognitive speed (cognition) as key domains.
  • Older age negatively impacted all domains except semantic memory efficiency; higher education positively affected all except cognitive speed at baseline.
  • Language domains showed steeper decline after age 73-74, while cognitive domains declined linearly; education did not mitigate the rate of decline.

Conclusions:

  • Language and cognitive domains exhibit differential associations with age and education at baseline.
  • Age-related changes manifest differently across language and cognitive domains over time.
  • Educational attainment does not appear to protect against the rate of longitudinal decline in these specific cognitive and language abilities.