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Click-evoked otoacoustic emissions: new techniques and applications
1MRC Institute of Hearing Research, Royal South Hants Hospital, Southampton, UK.
British Journal of Audiology
|April 1, 1993
Summary
Reducing evoked otoacoustic emissions test time is possible using maximum length sequences. This method allows for faster, uncontaminated recordings, offering practical clinical and economic benefits.
Area of Science:
- Audiology
- Otoacoustic Emissions
Background:
- Evoked otoacoustic emissions (EOAEs) are crucial for hearing diagnostics.
- Current EOAE testing can be time-consuming, limiting clinical efficiency.
- There is a need for faster EOAE testing and enhanced diagnostic information.
Purpose of the Study:
- To investigate a novel method for reducing EOAE test time.
- To assess the feasibility of obtaining more diagnostic data from EOAEs.
- To overcome limitations of increased stimulation rates in EOAE testing.
Main Methods:
- Utilized maximum length sequences (MLS) of clicks for EOAE stimulation.
- MLS allows for recording responses longer than the inter-stimulus interval.
- Deconvolution techniques were applied to obtain uncontaminated responses.
- Compared MLS recordings with conventional methods at lower rates (33/s, 50/s).
Main Results:
- Maximum length sequence recordings achieved stimulation rates up to 840/s.
- Waveforms from MLS and conventional methods showed strong correlation.
- A significant reduction in test time was achieved.
- Some adaptation of the emission was observed at the highest rates, but it did not impede results.
Conclusions:
- Maximum length sequences offer a viable method to significantly reduce EOAE test time.
- This technique overcomes the issue of stimulus-response overlap at higher rates.
- The method holds promise for economic and practical advantages in clinical audiology.
- Further research may explore the diagnostic information obtainable with this faster method.