Linking structure and activity in nonlinear spiking networks
Fig 2
Feynman diagrams for the first three cumulants of the inhomogeneous Poisson process.
Each dotted edge corresponds to a delta-function connecting the time indices of its two nodes. White nodes denote the measurement times, while gray nodes denote the times at which spikes are generated. The cumulants are constructed by convolving the term corresponding to the gray node with the product of all outgoing edges’ terms (Eq 5).