New SpikeFun update (v0.40) adds initial support for the spherical neural network topology (in a very early and buggy form - i.e. neuron picking is totally flawed!). Spherical topology is very useful, as it easily allows simulating of the "reentry" effect, which is also observed in the vertebrate central nervous system (so-called "thalamocortical loops"). Original idea for spherical topology for simulating reentry effects came from the Izhikevich et. al.