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The feasibility of maximum length sequences to reduce acquisition time of the middle latency response

Bell, S.L., Allen, R. and Lutman, M.E. (2001) The feasibility of maximum length sequences to reduce acquisition time of the middle latency response Journal of the Acoustical Society of America, 109, (3), pp. 1073-1081. (doi:10.1121/1.1340645).

Record type: Article


Maximum length sequences (MLS) have been used to improve the signal-to-noise ratio (SNR) of otoacoustic emissions [Thornton, J. Acoust. Soc. Am. 94, 132–136 (1993)] and the auditory brainstem response [Thornton and Slaven, Br. J. Audiol. 27, 205–210 (1993)]. By implication, a shorter recording time would be required to give equal signal-to-noise ratio (SNR). This study aimed to establish whether it is also possible to improve the SNR of the auditory-evoked potential termed the middle latency response (MLR) using maximum length sequences (MLS). Recordings of 180 s each were made using a conventional recording rate and MLS rates of 42, 89, and 185 clicks/s. Three different stimulus intensities were used in the range 30 to 70 dB nHL. The rate of 89 clicks/s was found to produce most improvement in SNR for both the Na–Pa region of the MLR and the Na–Pb region. This improvement in SNR using MLS implies that an MLS rate of 89 clicks/s would produce a fourfold reduction in recording time for equal SNR over conventional recording for the Pa–Nb region of the MLR at a stimulus intensity of 70 dB nHL. The latency of the Nb wave was found to reduce significantly using MLS. An MLR could not be recorded from every subject in this study, but more subjects had an identifiable response for MLS than for conventional recordings. Use of MLS to record the MLR appears to offer the potential for reduction in test time and better wave identification.

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Published date: March 2001
Keywords: otoacoustic emissions, auditory evoked potentials, patient diagnosis
Organisations: Human Sciences Group


Local EPrints ID: 10529
ISSN: 0001-4966
PURE UUID: f4ed157a-3a02-479c-9738-b2d2f8872c7e

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Date deposited: 23 Aug 2005
Last modified: 17 Jul 2017 17:06

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Author: S.L. Bell
Author: R. Allen
Author: M.E. Lutman

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