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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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Span, CRUNCH, and beyond: working memory capacity and the aging brain.

Nils J Schneider-Garces1, Brian A Gordon, Carrie R Brumback-Peltz

  • 1University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Journal of Cognitive Neuroscience
|March 27, 2009
PubMed
Summary

Older adults show greater brain activation than younger adults. This age-related difference in neural recruitment is largely explained by individual working memory span, not just age.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Older adults exhibit increased brain activation compared to younger adults for tasks of similar objective difficulty.
  • The Compensation-Related Utilization of Neural Circuits Hypothesis suggests older adults recruit neural resources earlier, potentially limiting capacity at higher loads.
  • This hypothesis predicts that age-related activation differences diminish when task difficulty is subjectively equated to individual capacity.

Purpose of the Study:

  • To investigate if age differences in brain activation during a memory task are attributable to individual working memory span.
  • To test the hypothesis of a nonlinear relationship between task load, performance, and brain activity.
  • To explore the correlation between brain activation asymptotes and performance plateaus, reflecting working memory capacity.

Main Methods:

  • Utilized a Sternberg memory search task to assess brain activity and performance.
  • Measured brain activation relative to individual memory span to equalize subjective task difficulty across age groups.
  • Analyzed the relationship between load, performance, and neural activation, including sigmoid functions.

Main Results:

  • Age differences in brain activation were significantly reduced when task difficulty was normalized to individual working memory span.
  • A nonlinear, sigmoid relationship was observed between task load and brain activation.
  • Performance and brain activation asymptotes correlated, supporting the role of working memory span in neural recruitment patterns.

Conclusions:

  • Individual working memory span, rather than age per se, largely accounts for observed age-related differences in brain activation.
  • Findings align with models of working memory capacity (e.g., Cowan's model) and theories of aging, particularly concerning inhibitory processes.
  • Subjective task difficulty, relative to individual capacity, is crucial for understanding age-related neurocognitive differences.