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Laboratory Reference for Clinical Neurophysiology$
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Jay A. Liveson and Dong M. Ma

Print publication date: 1999

Print ISBN-13: 9780195129243

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195129243.001.0001

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Auditory Evoked Responses

Auditory Evoked Responses

(p.324) Chapter 13 Auditory Evoked Responses
Laboratory Reference for Clinical Neurophysiology

Jay A. Liveson

Dong M. Ma

Oxford University Press

An auditory stimulus can be used to study the peripheral and central hearing apparatus. In addition to neurologic evaluation, it can also be used to evaluate peripheral (conductive and sensorimotor) hearing disorders. Clicks are used to sequentially activate the eighth nerve, followed by brainstem structures during the first ten milliseconds. The waves of the response (defined as positive upward peaks) correlate with brainstem regions. Wave I reflects acoustic nerve function. Waves II and III relate to structures in the pontomedullary region. Waves IV and V reflect function in the upper pons and low midbrain. Abnormalities occur if these structures are damaged, especially if myelin disease occurs. As such, the studies are especially useful in patients with acoustic neuromas, multiple sclerosis, brainstem gliomas, and trauma.

Keywords:   auditory stimulus, neurologic evaluation, hearing disorders, eighth nerve, waves, myelin disease, trauma, neuromas

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