The Inverse First Passage time problem seeks to determine the boundary
corresponding to a given stochastic process and a fixed first passage time
distribution. Here, we determine the numerical solution of this problem in the
case of a two dimensional Gauss-Markov diffusion process. We investigate the
boundary shape corresponding to Inverse Gaussian or Gamma first passage time
distributions for different choices of the parameters, including heavy and
light tails instances. Applications in neuroscience framework are illustrated.