Prediction of Δg(τ) when two spike trains with interspike intervals generated by a Poisson process are generated in the pre- and postsynaptic neurons. The mean ISI values, denoted as 〈ISI〉, are: (a) 5, (b) 10, (c) 20, (d) 50, and (e) 100 ms. The time lag τ between the pre- and postsynaptic spike trains is calculated by the time difference between the first two spikes of both spike trains. These figures are averaged over 500 realizations of the Poisson distributed spike train with 50 spikes in each set.