1. A method comprising: defining, using at least one processor, an electrical field solution within a preselected medium, the electrical field solution defined based on a configuration of at least one electrode; generating a first grid of neuron representatives in association with the at least one electrode; determining, using the at least one processor, an activation threshold value for each of the neuron representatives within the first grid of neuron representatives based on the electrical field solution; based on the activation threshold values for pairs of adjacent neuron representatives, adding additional neuron representatives between at least some of the pairs of adjacent neuron representatives; and generating a second grid of neuron representatives comprising the first grid of representatives, and the additional neuron representatives.