The auditory brainstem response (ABR) deals with ongoing electrical activity inside the brain and recorded through electrodes placed on the scalp. The resulting recording is a series of vertex positive waves in which I through V are evaluated. These waves labeled with roman numerals in Jewett and Williston convention and occur in the first 10 milliseconds after onset of an auditory stimulus. The ABR is considered an exogenous response due to its dependence upon external factors. The ABR is applying for newborn hearing screening, auditory threshold estimation, intraoperative monitoring, determining hearing loss type and degree, and auditory nerve and brainstem lesion detection. The ASSR utilizes statistical measures to determine differential diagnosis.
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