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Recorders, Physiologic, Evoked Potential, Auditory

Definition : Evoked potential physiologic recorders designed for detecting, amplifying and recording the brain's bioelectric response (i.e., the evoked potential, EP) to auditory external stimuli. These recorders typically consist of a detachable electrode usually placed on the scalp at the vertex and a reference electrode placed on the earlobe; signal amplifiers; filters (to suppress interference); memory (e.g., electronic or optical/magnetic disc); and a display. The non-stimulated ear is masked with white noise whose intensity is above the hearing level. Auditory EP recorders usually include capabilities to deliver external stimuli (e.g., clicks) at an appropriate repetitive level to elicit the bioelectric response needed for recording. Auditory EP recorders are mainly used in studies intended to diagnose the function of the auditory pathways and to differentiate coma due to metabolic factors from a coma due to structural damage. They are also used for screening the auditory function in infants.

Entry Terms : "Auditory Evoked-Potential Recorders" , "Audiometric Evoked-Potential Units" , "Recorders, Graphic, Evoked Potential, Auditory"

UMDC code : 16303

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