AEPs are the correlates of neural activity elicited by the application of an external sound. In the presence of an intact auditory pathway, the application of an external stimulus will induce an electrical potential at multiple cortical areas, representing the summation of synchronized electrical activity of thousands of neurons in auditory and non-auditory brain regions. The following overview will mainly focus on the neural correlates of the late AEPs obtained with electro-encephalography (EEG) and magneto- encephalography (MEG).