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An investigation into the relationship between input-output nonlinearities and rate-induced nonlinearities of click-evoked otoacoustic emissions recorded using maximum length sequences.

Record type: Article

The maximum length sequence (MLS) technique allows otoacoustic emissions (OAEs) to be recorded using clicks presented at very high presentation rates. It has previously been found that increasing the click presentation rate leads to increasing suppression (termed "rate-suppression") of the MLS evoked OAE (Hine, J.E., Thornton, A.R.D., 1997. Transient evoked otoacoustic emissions recorded using maximum length sequences as a function of stimulus rate and level. Ear Hear. 18, 121-128). It has been suggested that the source of rate-suppression arises from the same nonlinear processes that give rise to the well-known nonlinear growth of OAEs. Based on this assumption, a simple model of rate-suppression (Kapadia, S., Lutman, M.E., 2001. Static input-output nonlinearity as the source of nonlinear effects in maximum length sequence click-evoked OAEs. Br. J. Audiol. 35, 103-112) predicts that both input-output (I/O) nonlinearity and rate-suppression can be unified by characterising the stimulus in terms of its acoustic power which, at high rates, is proportional to the click presentation rate. The objective of this study was to test this simple model by recording MLS OAEs from a group of normally hearing adults over a range of stimulus rates from 40 to 5000 clicks/s, and of stimulus levels from 45 to 70 dB peSPL. The results are broadly in agreement with the predictions from the model, though there appears to be some tendency for the model to slightly overestimate the degree of rate-suppression for a given degree of I/O nonlinearity. It is also suggested that the model may break down more significantly in the presence of spontaneous OAEs.

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Citation

Lineton, B., Thornton, A.R.D. and Baker, V.J. (2006) An investigation into the relationship between input-output nonlinearities and rate-induced nonlinearities of click-evoked otoacoustic emissions recorded using maximum length sequences. Hearing Research, 219, (1-2), pp. 24-35. (doi:10.1016/j.heares.2006.05.005).

More information

Published date: 2006
Keywords: click evoked, brain-stem responses, maximum length sequences, transient evoked otoacoustic emissions, hearing, model, evoked otoacoustic emissions, level, otoacoustic emissions, stimulated acoustic emissions, growth, nonlinearities, ipsilateral suppression, maximum length sequence, rates, sequences, otoacoustic emission, adults, ear, temporal interactions, quality estimation, suppression, clicks, rate-suppression, ears
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 46348
URI: http://eprints.soton.ac.uk/id/eprint/46348
ISSN: 0378-5955
PURE UUID: 18564577-a7b6-46f6-b6a1-fe101c3105d4

Catalogue record

Date deposited: 19 Jun 2007
Last modified: 17 Jul 2017 15:08

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Contributors

Author: B. Lineton
Author: A.R.D. Thornton
Author: V.J. Baker

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