RT Journal Article
SR Electronic
T1 Time-varying Dynamic Network Model For Dynamic Resting State Functional Connectivity in fMRI and MEG imaging
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2021.04.01.438060
DO 10.1101/2021.04.01.438060
A1 Fei Jiang
A1 Huaqing Jin
A1 Yijing Gao
A1 Xihe Xie
A1 Jennifer Cummings
A1 Ashish Raj
A1 Srikantan Nagarajan
YR 2021
UL http://biorxiv.org/content/early/2021/04/02/2021.04.01.438060.abstract
AB Dynamic resting state functional connectivity (RSFC) characterizes fluctuations that occurs over time in functional brain networks. Existing methods to extract dynamic RSFCs, such as sliding-window and clustering methods, have various limitations due to their inherent non-adaptive nature and high-dimensionality including an inability to reconstruct brain signals, insufficiency of data for reliable estimation, insensitivity to rapid changes in dynamics, and a lack of generalizability across multimodal functional imaging datasets. To overcome these deficiencies, we develop a novel and unifying time-varying dynamic network (TVDN) framework for examining dynamic resting state functional connectivity. TVDN includes a generative model that describes the relation between low-dimensional dynamic RSFC and the brain signals, and an inference algorithm that automatically and adaptively learns to detect dynamic state transitions in data and a low-dimensional manifold of dynamic RSFC. TVDN is generalizable to handle multimodal functional neuroimaging data (fMRI and MEG/EEG). The resulting estimated low-dimensional dynamic RSFCs manifold directly links to the frequency content of brain signals. Hence we can evaluate TVDN performance by examining whether learnt features can reconstruct observed brain signals. We conduct comprehensive simulations to evaluate TVDN under hypothetical settings. We then demonstrate the application of TVDN with real fMRI and MEG data, and compare the results with existing benchmarks. Results demonstrate that TVDN is able to correctly capture the dynamics of brain activity and more robustly detect brain state switching both in resting state fMRI and MEG data.Competing Interest StatementThe authors have declared no competing interest.