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Click-evoked otoacoustic emissions (CEOAEs) recorded from neonates under 13 hours old using conventional and maximum length sequence (MLS) stimulation

De Boer, J., Brennan, S., Lineton, B., Stevens, J. and Thornton, A.R. (2007) Click-evoked otoacoustic emissions (CEOAEs) recorded from neonates under 13 hours old using conventional and maximum length sequence (MLS) stimulation Hearing Research, 233, (1-2), pp. 86-96. (doi:10.1016/j.heares.2007.07.006).

Record type: Article


Maximum length sequence (MLS) stimulation allows click evoked otoacoustic emissions (CEOAEs) to be averaged at very high stimulation rates. This enables a faster reduction of noise contamination of the response, and has been shown to improve the signal-to-noise ratio (SNR) of CEOAEs recorded from adult subjects. This study set out to investigate whether MLS averaging can enhance the SNR of CEOAEs recorded in newborns within the first day after birth, and so improve the pass rates for OAE screening in this period, when false alarm rates are very high. CEOAEs were recorded in a neonatal ward from 57 ears in 37 newborns ranging from 6 to 13 h old, using both conventional (50/s) and high rate (5000/s) MLS averaging. SNR values and pass rates were compared for responses obtained within equal recording times at both rates. MLS averaging produced an SNR improvement of up to 3.8 dB, with the greatest improvement found in higher frequency bands. This SNR advantage resulted in pass rate improvement between 5% and 10%, depending on pass criterion. A significant effect of age was found on both SNR and pass rate, with newborns between 6 and 10 h old showing significantly lower values than those tested between 10 and 13 h after birth, as well as a much greater improvement due to MLS averaging. The findings show that MLS averaging can reduce false alarm rates by up to 15% in very young neonates in a neonatal ward setting.

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Published date: 2007
Keywords: infant, neonatal screening, nonlinearities, suppression, newborns, ear, otoacoustic emissions, maximum length sequence, responses, rates, stimulation, humans, evoked otoacoustic emissions, hearing
Organisations: Human Sciences Group


Local EPrints ID: 49572
ISSN: 0378-5955
PURE UUID: 8446b819-2eb8-4f6d-8fee-4fc7b9f35c7e

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Date deposited: 16 Nov 2007
Last modified: 17 Jul 2017 14:55

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Author: J. De Boer
Author: S. Brennan
Author: B. Lineton
Author: J. Stevens
Author: A.R. Thornton

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