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 an impaired body part, and (b) detecting a region of the brain in which a response neural activity occurs in reaction to the neural signal; positioning at least a first electrode at the stimulation site; and applying an electrical potential to pass a current through the first electrode.