Vinceslas, Leny; Drga, Vit; Verhey, Jesko L; Yasin, Ifat; (2025) Association between speech in noise performance and inferred cochlear response functions. In: Proceedings of the 11th Convention of the European Acoustics Association: Forum Acusticum 2025. (pp. pp. 1-8). European Acoustics Association

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Abstract

Reduced cochlear functioning can affect speech perception in noise. Human inferred cochlear response input-output (I/O) functions can be obtained by objective measurement of distortion product otoacoustic emissions (DPOAEs) or by using psychophysical masking methods. I/O functions obtained using psychophysical methods take a longer time to acquire, than when obtained from DPOAE methods. However, psychophysical methods allow measurement of the inferred cochlear response I/O function in cases when DPOAEs may be absent. This study investigated the association between inferred cochlear response I/O functions obtained from nine normal-hearing listeners using DPOAEs and psychophysical forward-masking methods. I/O functions obtained using both methods were also compared to speech intelligibility scores obtained using the English-language Matrix speech test. The present study found that maximum cochlear compression inferred using the psychophysical method appeared to be moderately positively correlated with speech reception thresholds at noise levels of 45-65 dB SPL. Also, the maximum compression estimates obtained using DPOAEs covered a smaller range than the equivalent values obtained using the psychophysical method. Whilst the input levels associated with maximum compression covered a similar range across the two methods.

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