Experiments on Transient Oscillations in a Circuit of Diffusively Coupled Inverting Amplifiers

Transient oscillations in a ring neuron network with inhibitory coupling are observed in an analog circuit made with operating amplifiers experimentally. The transient oscillations last more than 10sec in the circuit of 40 amplifiers with the time constant 1 ms. The duration of the oscillations increases exponentially as the number of the amplifiers. Computer simulation shows that the transient oscillations are traveling waves in which the nodes in the circuit are separated into two blocks and their boundaries are moving. The mechanism of the oscillations and the exponential dependence of the duration on the system size are explained qualitatively.