Bifurcation phenomena observed from two-variable spiking neuron integrated circuit

A compact two-variable spiking neuron integrated circuit was proposed. Measurements of the circuit confirmed various types of spike responses with ultra-low power consumption. In this study, the two-variable spiking neuron circuit is modified to generate chaotic spike trains suitable for complex spatiotemporal information processing. The chaotic behavior is confirmed with time waveforms, return maps, bifurcation diagrams, and diversity index of inter-spike intervals through circuit simulations and experiments.