Also called Brainstem Evoked Response (BSER), Brainstem Auditory Evoked Response (BAER), and Auditory Evoked Response (AER), this test objectively measures hearing by placing electrodes on the scalp to record the electrical activity in the brain when sound occurs. It is used for newborn babies, infants, and young children who cannot respond reliably using standard procedures such as visual reinforcement audiometry, play audiometry, or picture identification.