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Differential age effects in semantic and episodic memory.

Philip A Allen1, Martin Sliwinski, Tanara Bowie

  • 1The University of Akron, Ohio 44325-4301, USA. paallen@uakron.edu

The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
|February 28, 2002
PubMed
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Aging affects memory processes differently. While a single factor influences memory performance intercept, separate factors impact semantic and episodic memory slopes, suggesting age-related dissociations in cognitive processing.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Gerontology

Background:

  • Understanding age-related memory decline is crucial for cognitive health.
  • Distinguishing between semantic and episodic memory processes in aging is an ongoing research area.
  • Previous models often treated memory as a general function, potentially overlooking specific age-related dissociations.

Purpose of the Study:

  • To investigate age-related differences in semantic and episodic memory.
  • To identify latent cognitive factors underlying memory performance in younger and older adults.
  • To test a theoretical framework proposing dissociations between central and peripheral memory processes across the lifespan.

Main Methods:

  • 80 participants (40 younger, 40 older adults) completed vocabulary, lexical decision, multiplication verification, hybrid visual search, and memory search tasks.

Related Experiment Videos

  • Data from multiple sessions and varied stimuli were analyzed using factor analysis.
  • Structural equation modeling was employed to assess age-related paths to latent memory factors.

    • Main Results:

    • Factor analysis revealed three latent factors: a shared intercept factor for both memory types and distinct slope factors for semantic and episodic memory.
    • Structural equation modeling supported a model with age influencing separate central episodic, central semantic, and combined peripheral processes.
    • This model demonstrated a better fit than general factor models, highlighting specific age-related dissociations.

    Conclusions:

    • Age-related memory changes are not uniform; dissociations exist between central and peripheral cognitive processes.
    • Episodic and semantic memory systems show distinct age-related trajectories, particularly in their central processing components.
    • The findings support a nuanced theoretical framework for understanding cognitive aging and memory.