Fig. 3

(a) State trajectories for selective spiking of Neuron 1 under Case 1 for several initial conditions. Trajectories either reach threshold under maximal input, or reach the guard under maximal input and then follow the boundary under a lower constant input until Neuron 1 reaches threshold. (b) State trajectories for selective spiking under Case 2 for several initial conditions. For those trajectories that do not reach Neuron 1 threshold (before hitting the guard) under maximal input, the input is zero until the trajectory decays to the switching separatrix, and then bangs high until Neuron 1 spikes.