(A) Degree distribution of links. The black trace corresponds to the degree for all the links (directed and undirected), the blue one to the degree of sources (out-directed links) and the red trace to sinks (in-directed links), averaged over subjects. Observe that (a) both directed link degree distributions are very similar, and (b) there is a scale-free trend, more marked when all links are considered. The dotted line corresponds to a power-law of 3/2. (B) Small-world topology of the networks. Clustering and average minimal path for functional networks (open circles), equivalent Erdös random networks (red crosses) and equivalent regular lattices (blue x's). Data points correspond to different subjects and tasks. (C) Assortative mixing of directed networks. The horizontal axis represents the total degree of each node, and the vertical axis the average degree of the first neighbors; all the data points correspond to one single subject.
Cecchi et al. BMC Cell Biology 2007 8(Suppl 1):S5 doi:10.1186/1471-2121-8-S1-S5