With electrostimulation or functional electrostimulation, a response from the neuron is generated by electrical impulses.
But I always read, for example, that a stimulating electrode is above position xy of the neuron (e.g. above the axon), but in order for current to flow, there must be a closed circuit? i.e. if cathodic stimulation is used (e.g. with a -0.5mA pulse lasting 0.05ms), then there must be an anodic pole somewhere so that the current can flow, or am I misunderstanding something?