Resting EEG spectral slopes are associated with age-related differences in information processing speed.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• The electroencephalogram (EEG) power spectrum slope distinguishes cognitive differences between younger and older adults.
• Previous studies linked EEG spectral properties to cognitive performance in experimental settings.

Purpose of the Study:

• To investigate the relationship between the resting EEG power spectrum and performance on the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS).
• To examine the mediating role of the EEG spectral slope in age-related cognitive performance variations.

Main Methods:

• Recruited 21 younger and 23 older adults for the study.
• Collected resting-state EEG data and administered the RBANS.
• Utilized spectral parameterization to analyze EEG data and test for mediation effects.

Main Results:

• Older adults exhibited significantly lower performance on the RBANS overall, especially in Attention and Delayed Memory domains.
• Mediation analysis revealed that the EEG spectral slope significantly mediated age-related performance differences solely on the Coding subtest.

Conclusions:

• The resting EEG power spectrum slope acts as a mediator for age-related cognitive differences, specifically in tasks requiring speeded processing.
• Despite observed age-related deficits in delayed memory, the EEG spectral slope did not significantly mediate performance in this domain.