Figure 3.

Node directionality can influence node importance. (A) In this undirected network, the red-bordered blue node scores best on centrality measures. As movement across this node is possible, in silico simulations of random walks, shortest paths or other types of movement will support the hypothesis that this node plays a key role in network structure. (B) In this directed network, in silico simulations of movement processes will not traverse the blue node. Hence, the red-bordered grey node can now be identified as having the most influence.