“…For instance, let us consider the diffusion Z with holding and jumping boundary c ≥ Z(0), associated to Z(t) = Z(0) + µt + B t with µ > 0, Z(0) > 0, and U ∈ (0, c). Z is similar to the Wiener-type neuronal model in the presence of refractoriness, considered in [8], [18], for which the neuron fires when its voltage exceeds the threshold c, and after the refractoriness period, the voltage is reset to U ∈ (0, c). We observe that the process Z can be reduced to our case; indeed, by using that −B t is distributed as B t , it follows that the distribution of the first hitting time of Z to c, when starting from Z(0) ≤ c, is nothing but the distribution of the first hitting time of X −µ to zero, when starting from c − Z(0) ≥ 0.…”