Abstract
Normal electrocochleographic (E.Co.G.) tracings were compared with those showing characteristics which resemble audiometric recruitment. The normal E.Co.G. shows two major features as click levels are raised: 1) Over the intensity range from 0–80 dB H.L., for the click, the VIII nerve action potential (AP) latency decreases from approximately 4 to 1.5 msec; and 2) at low click levels, the AP wave-form is diphasic, and shows a slow growth with increasing intensity, while at higher levels, the AP wave-form is monophasic and increases more rapidly with increases in sound level. Yoshie has referred to the low and high intensity portions of the AP amplitude curve as the L and H curves, respectively. In patients showing the “recruiting responses”, the threshold for the click is elevated and the latency is reduced at threshold. The wave-form of AP is diphasic over the entire intensity range, and AP amplitude grows much more rapidly than in the normal case. It appears that these “recruiting” responses represent the H curve of Yoshie with the L curve removed. The differences between normal and “recruiting” E.Co.G. responses can be given a tentative interpretation based on current findings on the structure and function of the peripheral auditory receptor.
Published Version
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