Chapter

Auditory Evoked Responses

Jay A. Liveson and Dong M. Ma

in Laboratory Reference for Clinical Neurophysiology

Published in print May 1999 | ISBN: 9780195129243
Published online March 2012 | e-ISBN: 9780199847792 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195129243.003.0013
Auditory Evoked Responses

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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

Chapter.  1076 words.  Illustrated.

Subjects: Neuroscience

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