1. A method for providing cortical stimulation to a patient, comprising: performing a noninvasive neurofunctional localization procedure to determine a cortical location at which a patient-specific intrinsic neural activity occurs; positioning a first electrode beneath the scalp at a cortical stimulation site corresponding to the cortical location; positioning a second electrode at a location remote from the cortical stimulation site; applying an electromagnetic signal to the patient using the first and second electrodes; modulating a neuroplastic activity with the applied signal to affect a patient symptom; and wherein the electrical signal has a parameter that varies in a pseudorandom manner.