Figure 1 | Scientific Reports

Figure 1

From: Cognitive performance in healthy older adults relates to spontaneous switching between states of functional connectivity during rest

Figure 1

Time-resolved dFC and its Leading Eigenvector V 1. (A) Resting-state BOLD signals from one subject at N = 90 brain areas. The traditional (static) FC matrix represents the correlation of BOLD signals over the whole recording time. (B) The dFC is obtained using BOLD Phase Coherence Connectivity20, such that each entry dFC(n, p, t) corresponds to the phase coherence between the BOLD signals in areas n and p at time t. At each time t, the dFC(t) is a symmetric NxN matrix. (C) The leading eigenvector, V 1 (t), captures the dominant connectivity pattern of dFC(t) at time t. We illustrate this pattern in two ways: (Left) We use V 1 (t) to scale the size of spheres placed at the center of gravity of each brain area, coloring alike elements with the same sign. (Right) We plot the eigenvector’s outer product V 1 V 1 T (see Methods - FC Leading Eigenvector).

Back to article page