Auditory Nerve and Brain Stem Responses to Sound Stimuli at Various Frequencies

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Abstract
The responses of the auditory nerve and brain stem auditory nuclei were recorded with ear lobe and scalp electrodes in response to unfiltered click stimuli which excite mainly high-frequency nerve fibers. To overcome this limitation, normal subjects and patients with hearing loss were stimulated with third-octave filtered clicks with center frequencies of 250, 500 and 1000 Hz. Analysis of the responses suggested that these lower-frequency stimuli excite lower-frequency cochlear nerve fibers. Low-frequency filtered clicks can be used to complement unfiltered clicks in order to obtain a more complete objective audiogram.

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