Influence of tACS on dynamic functional connectivity in healthy controls - A pilot study (tACS)

Carrasco-Gómez, Martín; León, Alberto del Cerro; Cabrera-Álvarez, Jesús; Maestú, Fernando

doi:10.1016/j.brs.2023.01.636

Cited by 1 publication

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“…Most studies involving dFC in the AD continuum have been conducted using functional magnetic resonance imaging (fMRI). These consistently report a progressive reduction of dFC among mild cognitive impairment and AD patients, involving relevant regions and networks such as the precunei and default mode network [23][24][25]. Studies addressing cognitively unimpaired individuals with AD pathology markers, however, show conflicting results, finding increases [26] and decreases [27] in dFC, this is, in the variability of FC over time, associated with the presence of Aβ.…”

Section: Introductionmentioning

confidence: 99%

Dynamic functional connectivity is modulated by the amount of p-Tau231 in blood in cognitively intact participants

Carrasco-Gómez,

García-Colomo,

Nebreda

et al. 2024

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INTRODUCTIONElectrophysiology and plasma biomarkers are early and non-invasive candidates for Alzheimer’s disease detection. The purpose of this paper is to evaluate changes in dynamic functional connectivity measured with magnetoencephalography, associated with the plasma pathology marker p-tau231 in unimpaired adults.METHODS73 individuals were included. Static and dynamic functional connectivity were calculated using leakage corrected amplitude envelope correlation. Each source’s strength entropy across trials was calculated. A data-driven statistical analysis was performed to find the association between functional connectivity and plasma p-tau231 levels. Regression models were used to assess the influence of other variables over the clusters’ connectivity.RESULTSFrontotemporal dynamic connectivity positively associated with p-tau231 levels. Linear regression models identified pathological, functional and structural factors that influence dynamic functional connectivity.DISCUSSIONThese results expand previous literature on dynamic functional connectivity in healthy individuals at risk of AD, highlighting its usefulness as an early, non-invasive and more sensitive biomarker.

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