Evoked potentials are electrophysiologic tests of the auditory system. In an evoked potential test, electrodes are placed on a patient’s head and an auditory stimulus is presented into the ear. Waveforms from the brain’s response to the stimuli are displayed using EP software and a clinician is able to interpret the results. Evoked potentials are made up of several individual tests such as ECochG, ABR, and ASSR, and each measure a different area of the auditory pathway.