AI Article Synopsis
- DPOAEs are sounds produced in the cochlea in response to two frequencies, consisting of nonlinear-distortion and coherent-reflection components, but traditional methods struggle with accuracy due to wave interference.
- Researchers developed a technique to separate DPOAE components using short stimulus pulses, enabling better measurement of distortion-product thresholds (EDPTs) in both normal-hearing and hearing-impaired subjects.
- This new method not only correlates well with behavioral thresholds but also significantly reduces standard deviation in estimated hearing thresholds (EHTs), improving the reliability of cochlear function assessments.
Article Abstract
Distortion-product otoacoustic emissions (DPOAEs) arise in the cochlea in response to two tones with frequencies f and f and mainly consist of two components, a nonlinear-distortion and a coherent-reflection component. Wave interference between these components limits the accuracy of DPOAEs when evaluating the function of the cochlea with conventional continuous stimulus tones. Here, DPOAE components are separated in the time domain from DPOAE signals elicited with short stimulus pulses. The extracted nonlinear-distortion components are used to derive estimated distortion-product thresholds (EDPTs) from semi-logarithmic input-output (I/O) functions for 20 normal-hearing and 21 hearing-impaired subjects. I/O functions were measured with frequency-specific stimulus levels at eight frequencies f = 1,…, 8 kHz (f/f = 1.2). For comparison, DPOAEs were also elicited with continuous primary tones. Both acquisition paradigms yielded EDPTs, which significantly correlated with behavioral thresholds (p < 0.001) and enabled derivation of estimated hearing thresholds (EHTs) from EDPTs using a linear regression relationship. DPOAE-component separation in the time domain significantly reduced the standard deviation of EHTs compared to that derived from continuous DPOAEs (p < 0.01). In conclusion, using frequency-specific stimulus levels and DPOAE-component separation increases the reliability of DPOAE I/O functions for assessing cochlear function and estimating behavioral thresholds.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426960 | PMC |
| http://dx.doi.org/10.1121/1.4982923 | DOI Listing |
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