Document Detail

The effect of high-pass filtering on TEOAE in 2-month-old infants.
MedLine Citation:
PMID:  11314913     Owner:  NLM     Status:  MEDLINE    
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.
J Kei; C Flynn; B McPherson; V Smyth; S Latham; J Loscher
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of audiology     Volume:  35     ISSN:  0300-5364     ISO Abbreviation:  Br J Audiol     Publication Date:  2001 Feb 
Date Detail:
Created Date:  2001-04-20     Completed Date:  2001-08-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0357321     Medline TA:  Br J Audiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  67-75     Citation Subset:  IM    
Department of Speech Pathology and Audiology, The University of Queensland, Australia.
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MeSH Terms
Acoustic Stimulation / methods
Auditory Perception / physiology*
Auditory Threshold / physiology
Cochlea / physiology*
Evoked Potentials, Auditory, Brain Stem / physiology*
Follow-Up Studies
Infant Behavior / physiology
Otoacoustic Emissions, Spontaneous / physiology*
Reference Values

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