Behavior of Olfactory-Related Frontal Lobe Oscillations in Alzheimer's Disease and Mci: A Pilot Study Publisher Pubmed



Fatemi SN¹ ; Aghajan H¹ ; Vahabi Z^{2, 3} ; Afzal A¹ ; Sedghizadeh MJ¹ Show Affiliations
Source: International Journal of Psychophysiology Published:2022

Abstract

Slow-gamma (35-45 Hz) phase synchronization and the coupling between slow-gamma and low-frequency theta oscillations (4–8 Hz) are closely related to memory retrieval and cognitive functions. In this pilot study, we assess the Phase Amplitude Coupling (PAC) between theta and slow-gamma oscillatory bands and the quality of synchronization in slow-gamma oscillations using Phase Locking Value (PLV) on EEG data from healthy individuals and patients diagnosed with amnestic Mild Cognitive Impairment (aMCI) and Alzheimer's Disease (AD) during an oddball olfactory task. Our study indicates noticeable differences between the PLV and PAC values corresponding to olfactory stimulation in the three groups of participants. These differences can help explain the underlying processes involved in these cognitive disorders and the differences between aMCI and AD patients in performing cognitive tasks. Our study also proposes a diagnosis method for aMCI through comparing the brain's response characteristics during olfactory stimulation and rest. Early diagnosis of aMCI can potentially lead to its timely treatment and prevention from progression to AD. © 2022 Elsevier B.V.