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Quantitative EEG evaluation in normal elderly subjects during mental processes: age-related changes

M G Marciani1, M Maschio, F Spanedda

  • 1Clinica Neurologica, Università degli Studi di Roma, Tor Vergata, Italy.

The International Journal of Neuroscience
|May 1, 1994
PubMed
Summary

This study on electroencephalography (EEG) in healthy elderly individuals found distinct brain activity patterns during mental tasks, suggesting these changes can serve as physiological markers of normal aging.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Biomedical Engineering

Background:

  • Aging is associated with changes in brain function.
  • Electroencephalography (EEG) is a non-invasive tool to study brain activity.
  • Understanding age-related EEG variations is crucial for identifying normal aging processes.

Purpose of the Study:

  • To investigate age-related differences in EEG patterns in healthy elderly subjects.
  • To identify EEG changes during rest and cognitive tasks.
  • To determine if EEG variations can serve as markers of normal aging.

Main Methods:

  • Computerized EEG recordings were performed on 39 healthy elderly subjects (50-90 years) and 21 young controls.
  • EEG data were collected at rest with eyes closed (EC) and during blocking reaction (BR), fixation (FIX), and mental arithmetic (MA) tasks.

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  • Analysis focused on relative power in different frequency bands (beta 1, alpha, beta 2) and their correlation with age.

    • Main Results:

    • At rest (EC), elderly subjects showed increased beta 1 power, correlated with age.
    • During mental tasks, elderly subjects exhibited decreased alpha reactivity (negatively correlated with age in older group) and increased beta 2 power during BR and FIX.
    • Slow activity showed minimal changes in the elderly during mental tasks compared to young controls.

    Conclusions:

    • Resting EEG in the elderly differs from young controls primarily by increased fast activity.
    • Cognitive task performance reveals age-related EEG changes, particularly in alpha reactivity, which may serve as physiological markers of normal aging.
    • These findings contribute to understanding the neurophysiological basis of healthy aging.