1. A method for optimizing electrical stimulation for an implantable stimulation device used to treat a patient's neurological disorder, wherein the stimulation device comprises 1) an electrode array having a plurality of electrodes that is positioned at a target therapy site such that the array is above the skull and below the dura over the target therapy site; and 2) a sensing device that is capable of sensing the patient's response to the electrical stimulation, the method comprising; selecting a configuration of electrodes on the electrode array in which a first electrical stimulus is applied to the configuration of electrodes that have been positioned at the therapy site; selecting an alternate configuration of electrodes on the electrode array in which a second electrical stimulus is applied to the alternate configuration of electrodes that have been positioned at the therapy site, wherein the selecting the alternate configuration of electrodes comprises correlating a plurality of sensed responses based upon sensing the patient's response to the applied first or second electrical stimulus using the sensing device with corresponding electrode configurations to determine an electrode configuration/response trend and determining a new electrode configuration that is expected to improve efficacy according to the electrode-configuration/response trend; and choosing a therapeutic configuration of electrodes corresponding to the sensed patient's response that is within a desired range and/or provides an improved response compared to other sensed responses.