Dynamic functional connectivity states between the dorsal and ventral sensorimotor networks revealed by Dynamic Conditional Correlation analysis of resting state functional MRI.

Brain Connect. 2017 Oct 02;:

Authors: Syed MF, Lindquist M, Pillai JJ, Agarwal S, Gujar SK, Choe AS, Caffo BS, Sair HI

Abstract
Functional connectivity in resting state functional Magnetic Resonance Imaging (rs-fMRI) has received substantial attention since the initial findings of Biswal et al. Traditional network correlation metrics assume that the functional connectivity in the brain remains stationary over time. However, recent studies have shown that robust temporal fluctuations of functional connectivity among as well as within functional networks exist, challenging this assumption. In this study, these dynamic correlation differences were investigated between the dorsal and ventral sensorimotor networks by applying the Dynamic Conditional Correlation (DCC) model to rs-fMRI data of 20 healthy subjects. K-means clustering was used to determine an optimal number of discrete connectivity states (k=10) of the sensorimotor system across all subjects. Our analysis confirms the existence of differences in dynamic correlation between the dorsal and ventral networks, with highest connectivity found within the ventral motor network.

PMID: 28969437 [PubMed - as supplied by publisher]