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Structural modeling of dynamic changes in memory and brain structure using longitudinal data from the normative aging

John J McArdle1, Fumiaki Hamgami, Kenneth Jones

  • 1Department of Psychology, PO Box 400400, University of Virginia, Charlottesville, VA 22906-4400, USA. jjm@virginia.edu

The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
|December 4, 2004
PubMed
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Brain structure changes, specifically larger lateral ventricles, predict future memory declines in adults. This longitudinal study reveals brain aging precedes cognitive aging, offering insights into memory loss mechanisms.

Area of Science:

  • Neuroscience
  • Psychology
  • Biostatistics

Background:

  • Aging is associated with changes in both brain structure and cognitive function, particularly memory.
  • Understanding the temporal relationship between brain structure and memory decline is crucial for developing interventions.
  • Previous studies have often examined cross-sectional data or lacked sophisticated longitudinal modeling.

Purpose of the Study:

  • To investigate the time-dependent associations between brain structure (lateral ventricular size) and memory performance (Wechsler memory score) over a 7-year interval.
  • To apply novel longitudinal structural equation modeling techniques to analyze these associations.
  • To determine the directionality of the relationship between brain changes and memory decline.

Main Methods:

Related Experiment Videos

  • Longitudinal study design with 225 participants aged 30-80 years at baseline.
  • Repeated measures of lateral ventricular size and Wechsler memory score over a 7-year period.
  • Application of mixed-effects latent growth curve modeling, latent difference score analyses, and bivariate dynamic structural equation modeling.

    • Main Results:

    • Longitudinal changes in lateral ventricular size and Wechsler memory score were best described by an exponential or dual change model.
    • Analyses revealed age-lagged changes between brain structure and memory, operating in a coupled-over-time fashion.
    • Lateral ventricular size emerged as a leading indicator of subsequent Wechsler memory score declines.

    Conclusions:

    • Brain structural changes, specifically increases in lateral ventricular size, precede and predict longitudinal declines in memory performance.
    • The findings suggest a causal pathway where brain aging acts as a leading indicator for cognitive aging.
    • These results highlight the utility of advanced longitudinal modeling in understanding the dynamic interplay between brain structure and memory over time.