PMID: 11336891May 5, 2001Paper

Temporal non-linearities of the cochlear amplifier revealed by maximum length sequence stimulation

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
A R ThorntonJemma E Hine

Abstract

The objective of this study was to examine whether temporal non-linearities of the cochlear amplifier, as reflected by otoacoustic emissions (OAEs), exist and are distinct from any recording system non-linearities. Maximum length sequence stimulation, at various stimulus rates, was used to evoke OAEs from normally hearing subjects. Recordings from a 2cc cavity were also made. The data were analyzed to obtain the linear response and estimates of the slices of the 2nd and 3rd order Volterra kernels. This provided a measure of two and 3 click non-linear temporal interactions, respectively. The results showed that temporal non-linearities of OAEs do exist, are stable and repeatable within individuals and have properties that differ from those shown by the conventional linear response. Whilst some of the non-linear response properties conformed to the expected pattern, of increasing amplitude with increase in stimulus rate, there are some areas in which they show an unpredicted complexity. Whilst system non-linearities could be found, there was no difficulty in distinguishing between the physiological and system non-linear components. New areas of research and application may result from the use of these new OAE responses.

References

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Citations

Mar 14, 2007·The Journal of the Acoustical Society of America·Michael A AkeroydStuart Gatehouse
Oct 26, 2010·The Journal of the Acoustical Society of America·Christopher L Bennett, Özcan Özdamar
Feb 22, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Brigitte A LavoieA R D Thornton
Oct 23, 2003·International Journal of Audiology·S HatzopoulosA Martini

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