“…Here we start by adopting the SI-model for the propagation of a disease factor in AD. However, we use this model to connect with the theory of network communicability, which has been widely used in network neurosciences (for some applications of communicability in pathoconnectomics see [30,31,32,33,34,35,36,37,38,39,40]). That is, we will provide a theoretical connection between the network communicability and the probability of a disease factor of propagating from one node to another in a network.…”