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Power shift and connectivity changes in healthy aging during resting-state EEG.

Alessio Perinelli¹, Sara Assecondi¹, Chiara F Tagliabue¹

¹Center for Mind/Brain Sciences (CIMeC), University of Trento, Corso Bettini 31, 38068 Rovereto, TN, Italy.

|April 27, 2022

Summary

Aging brains show a shift in neural activity from back to front, even at rest. This study reveals changes in brain connectivity patterns in older adults, suggesting a general aging brain feature.

Keywords:

Aging Connectivity EEG Resting-state

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Area of Science:

Neuroscience
Aging Brain Research

Background:

Human brain activity patterns change with age, typically shifting from posterior to anterior regions during tasks.
Functional magnetic resonance imaging (fMRI) has primarily shown these age-related shifts during task execution.

Purpose of the Study:

To investigate if age-related shifts in neural activity occur during resting-state conditions.
To examine changes in brain connectivity and network organization associated with aging using electroencephalography (EEG).

Main Methods:

Analysis of oscillatory power distribution in source-space time series from electroencephalographic (EEG) recordings during rest.
Evaluation of inter-area and intra-area brain connectivity changes with age.

Main Results:

A significant shift in oscillatory power from posterior to anterior brain areas was observed in older adults.
Strengthened inter-area connectivity in frontal, parietal, and temporal regions was noted in older individuals.
Age-related changes in intra-area connections showed enhancement in parietal/temporal and reduction in frontal areas, with overall decreased network modularity.

Conclusions:

The findings confirm an age-related posterior-to-anterior shift in neural activity during resting-state, indicating it's a general aging brain characteristic.
The study provides novel insights into the reorganization of resting-state brain networks, including altered connectivity patterns, in the aging brain.