1. A method of effectuating a neural-function of a patient associated with an impaired body part, comprising: selecting a stimulation site by (a) generating an intended neural activity by triggering a neural signal in or from the impaired body part, wherein the impaired body part is a limb, digit or combination thereof affected by neural dysfunction of the patient's brain, (b) detecting a cortical region of the brain in which a response neural activity occurs in reaction to the neural signal and (c) selecting the stimulation site to be within the detected cortical region; positioning at least a first electrode at the stimulation site; and applying an electrical potential to pass a current through the first electrode.