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Neurophysiological signals of working memory in normal aging.

L K McEvoy1, E Pellouchoud, M E Smith

  • 1San Francisco Brain Research Institute and SAM Technology, 425 Bush St., Fifth Floor, 94108, San Francisco, CA 94108, USA. linda@eeg.com

Brain Research. Cognitive Brain Research
|May 8, 2001
PubMed
Summary

Neurophysiological signals in working memory (WM) change with age. Older adults show altered brain activity patterns, suggesting shifts in cognitive strategies for spatial tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Working memory (WM) is crucial for cognitive function.
  • Understanding age-related changes in WM neurophysiology is important for healthy aging research.

Purpose of the Study:

  • To investigate how neurophysiological signals of working memory change across the adult lifespan.
  • To compare brain activity patterns during a spatial WM task in young, middle-aged, and older adults.

Main Methods:

  • Electroencephalography (EEG) was recorded from healthy young, middle-aged, and older adults performing spatial WM tasks of varying difficulty.
  • Event-related potentials (ERPs), specifically P300 and P200 components, and EEG spectral features (theta and alpha rhythms) were analyzed.
  • Groups were matched for IQ and task practice to control for confounding factors.

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Main Results:

  • Cognitive performance slowed with age, especially on difficult tasks.
  • Advanced age was linked to decreased P300 amplitude and increased latency, and increased frontal P200 amplitude.
  • Younger adults showed increased frontal midline theta rhythm with task difficulty, unlike older adults.
  • Age-related changes in alpha power indicated differing recruitment of neural resources for spatial WM processing across age groups.

Conclusions:

  • Normal aging is associated with alterations in fronto-parietal networks supporting spatial working memory.
  • Younger adults may rely more on parietal regions, while older adults might shift towards frontal brain regions for spatial WM processing.
  • These findings highlight age-related neuroplasticity and strategy adjustments in working memory.