In this paper, based on a chain Hindmarsh–Rose (HR) neural network under the action of electromagnetic field, the effects of connection strength between adjacent neurons on the wave propagation are investigated by utilizing numerical simulations. When the connection strength is increased via the decreasing of distance from central neuron, it is found that the firing rates of neurons in chain HR neural network are increased, and the velocity of wave propagation also becomes fast with the increasing of connection strength maximum. The chemical a...