1. A method for displaying a volume of influence by an electrode inserted in neural tissue of a patient, the method comprising: calculating a predicted volume of influence, wherein the predicted volume of influence is a prediction of the amount of neural tissue that will be activated by the electrode: displaying a target volume of influence and the predicted volume of influence on a display screen; and configuring a mathematical model of (a) the electrode inserted inside the neural tissue and (b) a representation of an encapsulation tissue around the electrode.