Fig. 2

Distribution of the synaptic potentiation probability ς over all possible realizations of the coding ratio vector ϕ for three different values of the number of patterns P and the variation coefficient ${\sigma }_{\varphi }/{\varphi }_0$. The histograms (blue) correspond to one million random samples of the coding ratio vector ϕ. The elements of ϕ are drawn randomly from the Gamma distribution with ${\varphi }_0=0.01$, shown in Fig. 1. The normal distribution (red) with mean $〈\varsigma 〉$ and variance ${\sigma }_{\varsigma }^2$ (see the Appendix) is a good approximation to the true distribution of ς for low values of ${\sigma }_{\varphi }/{\varphi }_0$