Computing auditory fatigue of the whole nerve action potential

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Abstract
Fatigue at the level of the 8th nerve is often calculated through the measurement of the whole nerve action potential (AP). The losses were quantified by calculating the dB shift required to record a criterion AP voltage or by determining the ratio of the pre- and post-exposure AP voltages at a constant probe intensity. Whether the 2 methods produce similar AP losses was investigated. Fifteen rats were exposed to a 6000-Hz pure tone at either 100, 105 or 110 dB SPL [sound pressure level] for 5 min. Input-output functions were determined at 5 probe frequencies prior to and following exposure. When the probe intensity (i.e., AP voltage) was low, AP losses appeared greater when the AP fatigue was computed at a constant intensity. This trend was reversed at higher probe levels. These results are explained on the basis of the growth behavior of the AP.

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