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Updated: Jul 12, 2026
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Optogenetic Stimulation of the Auditory Nerve
Published on: October 8, 2014
'Derived nonlinear' versus 'linear' click-evoked otoacoustic emissions
P Ravazzani1, G Tognola, F Grandori
1Department of Biomedical Engineering, Polytechnic of Milan, Italy.
Summary
The derived nonlinear response (DNLR) technique reduces stimulus artifacts in transient-evoked otoacoustic emissions (TEOAE) recordings. However, it introduces more noise, potentially limiting its effectiveness despite similar frequency content to linear methods.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Signal Processing
Background:
- Transient-evoked otoacoustic emissions (TEOAE) recordings are often contaminated by stimulus artifacts.
- A nonlinear estimation method, the derived nonlinear response (DNLR), is commonly used to mitigate these artifacts.
Purpose of the Study:
- To analyze basic properties of DNLR, including short-time input/output relationships.
- To compare linear (averaging) and DNLR techniques in time and frequency domains.
Main Methods:
- Comparison of linear and DNLR recording techniques in the same ears.
- Analysis of TEOAE recordings at various stimulus levels.
- Time and frequency domain analysis of the responses.
Main Results:
- DNLR effectively reduces linear artifact content at latencies < 6 ms, isolating the initial emission.
- At latencies > 6 ms, DNLR shows no additional features compared to linear recordings.
- DNLR recordings are significantly noisier than linear recordings, impacting effectiveness.
- Linear and DNLR responses exhibit similar frequency content, especially at high stimulus levels.
Conclusions:
- DNLR is effective in reducing stimulus artifacts in TEOAE, particularly for early response components.
- Increased noise in DNLR may reduce its practical utility compared to linear methods.
- Both techniques yield comparable frequency spectra, suggesting robustness in spectral analysis.
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