1. A medical monitoring system, comprising: an electroencephalography (EEG) sensor array comprising a plurality of electrodes configured for EEG monitoring, wherein the plurality of electrodes are configured to be disposed about a patient's head, and wherein the plurality of electrodes comprise a ground electrode, a reference electrode, and a plurality of sensing electrodes; an EEG monitor operatively coupled to the EEG sensor array, wherein the EEG monitor comprises: input circuitry configured to receive EEG signals from the plurality of sensing electrodes; a processor configured to: determine a plurality of depth of anesthesia indices based at least in part on the EEG signals; and generate a topographic color map of the depth of anesthesia indices based on a color scale, wherein the color scale comprises a predetermined set of colors, wherein each color of the predetermined set of colors represents a predetermined depth of anesthesia index; and a display configured to display the topographic color map; wherein the EEG monitor is configured to receive a user selection of one or more regions of the patient's head to monitor, and wherein the display is configured to display an anesthesia index for each of the one or more regions.