Fig. 7: Edge functional connectivity and edge community construction.

A Visualization of the edge functional connectivity (eFC) under mental imagery condition using a force-directed layout. The correlation matrices of all participants’ time series are averaged to form a single matrix representing eFC, which is visualized with a threshold of 0.95. Each point in the graph represents an individual edge, and the color of the point is determined by the brain network to which the edge’s stub nodes belong. B Matrices corresponding to the edge community and edge community similarity for the 400 brain regions of the Yeo-Krienen 17-networks atlas (k = 10) under mental imagery condition. The x-axis and y-axis represent the 400 brain nodes. In the Edge communities matrix, the position i-j indicates the community number (ranging from 1 to 10) to which the edge formed by brain nodes i and j belongs. In the Edge community similarity matrix, the position i-j represents the degree of similarity between the edge communities to which brain nodes i and j belong. C Sankey plot illustrating the correspondence between the communities to which edges belong and the brain networks where the connected nodes reside (k = 10) under mental imagery condition. The plot demonstrates that non-overlapping edge partitions result in overlapping nodal partitions. VIS visual network, SMN sensorimotor network, DAN dorsal attention network, SAL salience network, LIM limbic network, FPCN frontoparietal control network, DMN default mode network, TP temporal-parietal network.