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• W4377047319 abstract "Abstract Edge time series decompose functional connectivity into its framewise contributions. Previous studies have focused on characterizing the properties of high-amplitude frames (time points when the global co-fluctuation amplitude takes on its largest value), including their cluster structure. Less is known about middle- and low-amplitude co-fluctuations (peaks in co-fluctuation time series but of lower amplitude). Here, we directly address those questions, using data from two dense-sampling studies: the MyConnectome project and Midnight Scan Club. We develop a hierarchical clustering algorithm to group peak co-fluctuations of all magnitudes into nested and multiscale clusters based on their pairwise concordance. At a coarse scale, we find evidence of three large clusters that, collectively, engage virtually all canonical brain systems. At finer scales, however, each cluster is dissolved, giving way to increasingly refined patterns of co-fluctuations involving specific sets of brain systems. We also find an increase in global co-fluctuation magnitude with hierarchical scale. Finally, we comment on the amount of data needed to estimate co-fluctuation pattern clusters and implications for brain-behavior studies. Collectively, the findings reported here fill several gaps in current knowledge concerning the heterogeneity and richness of co-fluctuation patterns as estimated with edge time series while providing some practical guidance for future studies." @default.
• W4377047319 created "2023-05-19" @default.
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• W4377047319 date "2023-01-01" @default.
• W4377047319 modified "2023-10-17" @default.
• W4377047319 title "Hierarchical organization of spontaneous co-fluctuations in densely sampled individuals using fMRI" @default.
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• W4377047319 doi "https://doi.org/10.1162/netn_a_00321" @default.
• W4377047319 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37781150" @default.
• W4377047319 hasPublicationYear "2023" @default.
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