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Alpha desynchronization during Stroop test unmasks cognitively healthy individuals with abnormal CSF Amyloid/Tau.

Authors: Xianghong Arakaki|||Shao-Min Hung|||Roger Rochart|||Alfred N Fonteh|||Michael G Harrington

Journal: Neurobiology of aging

Publication Type: Journal Article

Date: 2022

DOI: NIHMS1773555

ID: 35066324

Affiliations:

Affiliations

    Neurosciences, Huntington Medical Research Institutes, Pasadena, CA, USA. Electronic address: xianghong@hmri.org.|||Neurosciences, Huntington Medical Research Institutes, Pasadena, CA, USA; Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.|||Neurosciences, Huntington Medical Research Institutes, Pasadena, CA, USA.|||Neurosciences, Huntington Medical Research Institutes, Pasadena, CA, USA.|||Department of Neurology, University of Southern California, Los Angeles, CA, USA.

Abstract

Synaptic dysfunctions precede cognitive decline in Alzheimer's disease by decades, affect executive functions, and can be detected by quantitative electroencephalography (qEEG). We used quantitative electroencephalography combined with Stroop testing to identify changes of inhibitory controls in cognitively healthy individuals with an abnormal versus normal ratio of cerebrospinal fluid (CSF) amyloid/total-tau. We studied two groups of participants (60-94 years) with either normal (CH-NAT or controls, n = 20) or abnormal (CH-PAT, n = 21) CSF amyloid/tau ratio. We compared: alpha event-related desynchronization (ERD), alpha spectral entropy (SE), and their relationships with estimated cognitive reserve. CH-PATs had more negative occipital alpha ERD, and higher frontal and occipital alpha SE during low load congruent trials, indicating hyperactivity. CH-PATs demonstrated fewer frontal SE changes with higher load, incongruent Stroop testing. Correlations of alpha ERD with estimated cognitive reserve were significant in CH-PATs but not in CH-NATs. These results suggested compensatory hyperactivity in CH-PATs compared to CH-NATs. We did not find differences in alpha ERD comparisons with individual CSF amyloid(A), p-tau(T), total-tau(N) biomarkers.


Chemical List

    Amyloid beta-Peptides|||Biomarkers|||Peptide Fragments|||tau Proteins

Reference List

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