Cerebellar EEG Source Localization Reveals Age-Related Compensatory Activity Moderated by Genetic Risk for Alzheimer’s Disease

Authors

Elizabeth Paitel, Marquette University
Kristy A. Nielson, Marquette UniversityFollow

Document Type

Article

Publication Date

12-2023

Publisher

Wiley

Source Publication

Psychophysiology

Source ISSN

0048-5772

Original Item ID

DOI: 10.1111/psyp.14395

Abstract

The apolipoprotein-E (APOE) ε4 allele is the greatest genetic risk factor for late-onset Alzheimer's disease (AD), but alone it is not sufficiently predictive. Because neuropathological changes associated with AD begin decades before cognitive symptoms, neuroimaging of healthy, cognitively intact ε4 carriers (ε4+) may enable early characterization of patterns associated with risk for future decline. Research in the cerebral cortex highlights a period of compensatory recruitment in elders and ε4+, which serves to maintain cognitive functioning. Yet, AD-related changes may occur even earlier in the cerebellum. Advances in electroencephalography (EEG) source localization now allow effective modeling of cerebellar activity. Importantly, healthy aging and AD are associated with declines in both cerebellar functions and executive functioning (EF). However, it is not known whether cerebellar activity can detect pre-symptomatic AD risk. Thus, the current study analyzed cerebellar EEG source localization during an EF-dependent stop-signal task (i.e., inhibitory control) in healthy, intact older adults (M_age = 80 years; 20 ε4+, 25 ε4−). Task performance was comparable between groups. Older age predicted greater activity in left crus II and lobule VIIb during the P300 window (i.e., performance evaluation), consistent with age-related compensation. Age*ε4 moderations specifically showed that compensatory patterns were evident only in ε4−, suggesting that cerebellar compensatory resources may already be depleted in healthy ε4+ elders. Thus, the posterolateral cerebellum is sensitive to AD-related neural deficits in healthy elders. Characterization of these patterns may be essential for the earliest possible detection of AD risk, which would enable critical early intervention prior to symptom onset.

Comments

Accepted version. Psychophysiology, Vol. 60, No. 12 (December 2023). DOI. © 2023 Wiley. Used with permission.

Recommended Citation

Paitel, Elizabeth and Nielson, Kristy A., "Cerebellar EEG Source Localization Reveals Age-Related Compensatory Activity Moderated by Genetic Risk for Alzheimer’s Disease" (2023). Psychology Faculty Research and Publications. 589.
https://epublications.marquette.edu/psych_fac/589