The effect of high-pass filtering on TEOAE in 2-month-old infants

Kei, J, Flynn, C, McPherson, B, Smyth, V, Latham, S and Loscher, J (2001) The effect of high-pass filtering on TEOAE in 2-month-old infants. British Journal of Audiology, 35 1: 67-75.

Author Kei, J
Flynn, C
McPherson, B
Smyth, V
Latham, S
Loscher, J
Title The effect of high-pass filtering on TEOAE in 2-month-old infants
Journal name British Journal of Audiology   Check publisher's open access policy
ISSN 1499-2027
Publication date 2001-02
Sub-type Article (original research)
Volume 35
Issue 1
Start page 67
End page 75
Total pages 9
Editor D. M. Baguley
Place of publication London, U.K.
Publisher Whurr Publishers
Collection year 2001
Language eng
Subject C1
321025 Rehabilitation and Therapy - Hearing and Speech
730111 Hearing, vision, speech and their disorders
Abstract The aim of the present study was to investigate the effect of high-pass filtering on TEOAE obtained from 2-month-old infants as a function of filter cut-off frequency, activity states and pass/fail status of infants. Two experiments were performed. In Experiment 1, 100 2-month-old infants (200 ears) in five activity states (asleep, awake but peaceful, sucking a pacifier, feeding, restless) were tested by use of TEOAE technology. Five different filter conditions were applied to the TEOAE responses post hoc. The filter conditions were set at 781 Hz (default setting), 1.0, 1.2, 1.4 and 1.6 kHz. Results from this experiment showed that TEOAE parameters, such as whole-wave reproducibility (WR) and signal-to-noise ratio (SNR) at 0.8 kHz and 1.6 kHz, changed as a function of the cut-off frequency. The findings suggest that the 1.6 kHz and 1.2 kHz filter conditions are optimal for WR and SNR pass/fail criteria, respectively. Although all infant recordings appeared to benefit from the filtering, infants in the noisy states seemed to benefit the most. In Experiment 2, the high-pass filtering technique was applied to 23 infants (35 ears) who apparently failed the TEOAE tests on initial screening but were subsequently awarded a pass status based on the results from a follow-up auditory brainstem response (ABR) assessment. The findings showed a significant decrease in noise contamination of the TEOAE with a corresponding significant increase in WR. With high-pass filtering at 1.6 kHz, 21/35 ears could be reclassified into the pass category.
Keyword Otorhinolaryngology
Transient Evoked Otoacoustic Emissions (teoae)
Evoked Otoacoustic Emissions
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
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Created: Tue, 14 Aug 2007, 15:59:23 EST