Fig. 1

The predicted Ji,j + Jj,I is compared to the true Ji,j + Jj,I for a recording of spontaneous activity from a neuronal culture. Only excitatory connections are included. The analytic expression requires that Δt be sufficiently small, and here Δt is 3 ms—not small enough. Even so, we see a strong relationship between predictions and measurements with R = 0.5