Introduction: Functional connectivity derived from neuroimaging data is a measure of correlation, or covariance, between spatially remote neurofunctional events. However, it is still unclear to what extent these interregional correlations reflect the dynamical features of the brain functional processes, or structural constraints of the underlying neuronal substrate. To address this question, we...

In functional connectivity analysis, networks of interest are defined based on correlation with the mean time course of a user-selected 'seed' region. In this work we propose to simultaneously estimate the optimal representative time courses that summarize the fMRI data well and the partition of the volume into a set of disjoint regions that are best explained by these representative time cours...

Fig.2. Manganese-induced ΔR1 in contralesional M2, S1FL and S2 at 1 day after injection in M1, and corresponding functional connectivity (FC) between contralesional M1 and M2, S1FL and S2 for both control (=C) (n=7) and stroke (=S) (n=5) groups. Enhanced functional and structural connectivity in the contralesional hemisphere after unilateral stroke in rats: A combined resting-state fMRI and MEM...

Introduction: Low frequency fluctuations in T2*-weighted MR images have been used to map functional connectivity (FC) in both humans and rats [1, 2, 3, 4]. Previous studies performed on rats have demonstrated the presence of networks within somatosensory as well as visual systems [2, 3, 4]. Although multiple slices were acquired in two of the studies [3, 4], those studies focused on functional ...

In the absence of external stimuli, fluctuations in cerebral activity can be used to reveal intrinsic structures. Well-conditioned probabilistic models of this so-called resting-state activity are needed to support neuroscientific hypotheses. Exploring two specific descriptions of resting-state fMRI, namely spatial analysis and connectivity graphs, we discuss the progress brought by statistical...

Functional connectivity refers to correlations between spatially remote neurophysiological events as described by Friston & Büchel. Functional connectivity is simply a statement about the observed correlations and does not imply how the correlation is mediated. Effective connectivity is closer to inter-neuronal connectivity as it refers to influence that one neuronal system exerts over another ...

Background/Purpose: In the context of the European Biodiversity policy, the Green Infrastructure Strategy is one supporting tool to mitigate fragmentation, inter-alia to increase the spatial and functional connectivity between protected and unprotected areas. The Joint Research Centre has developed an integrated model to provide a macro-scale set of indices to evaluate the connectivity of the N...