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Cortical Source Analysis of High-Density EEG Recordings in Children

Cortical Source Analysis of High-Density EEG Recordings in Children

Published on: June 30, 2014

Age-related changes in EEG signal using triple correlation values.

Yuri Watanabe¹, Takashi Shibata^2,3, Mieko Tanaka¹

¹Brain Functions Laboratory, Inc., Tokyo, Japan.

Frontiers in Human Neuroscience

|October 10, 2024

Summary

Younger adults show higher spatial variability (S values) and lower temporal variability (SD values) in frontal electroencephalography (EEG) alpha rhythms compared to older adults. This suggests distinct aging patterns in brain activity.

Keywords:

EEG aging alpha-bands correlation dipole

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Area of Science:

Neuroscience
Human electroencephalography (EEG)
Brain aging research

Background:

The alpha rhythm's frequency decreases with age.
Elderly individuals with dementia show higher spatial (S) and temporal (SD) variability in occipital EEG compared to healthy elderly.
Frontal region analysis in healthy aging is less understood.

Purpose of the Study:

To investigate age-related changes in spatial (S) and temporal (SD) variability of the alpha band in the frontal EEG of healthy individuals.
To compare these variability measures between young adults, elderly adults, and dementia patients.

Main Methods:

Electroencephalography (EEG) data recorded from 50 healthy elderly, 34 healthy younger adults, and 21 dementia patients.
EEG recorded for 5 minutes during rest with eyes closed.
Calculation of S and SD values for the alpha band (8-13 Hz) using frontal electrodes (F3, F4, Fpz) via triple correlation.

Main Results:

Healthy young adults exhibited significantly higher S values (spatial variability) than healthy elderly adults (p < 0.01).
Healthy young adults tended to have lower SD values (temporal variability) than healthy elderly adults.
Elevated S values in young adults suggest greater spatial variability, similar to dementia patients, while lower SD values indicate less temporal variability, unlike dementia patients.

Conclusions:

Healthy young adults display distinct frontal alpha rhythm variability patterns compared to healthy elderly individuals.
The observed differences in S and SD values in young adults may indicate a more abundant normal cortical dipole in the frontal regions.
These findings highlight unique electrophysiological characteristics associated with healthy aging in the frontal cortex.