Abstract
Some evidence suggests that perceived amplitude modulation (AM) depth may be exaggerated for listeners with cochlear hearing loss (HI) compared to listeners with normal hearing (NH) due to a less compressive auditory system. Consistent with this, several researchers have demonstrated that interfering AM causes more masking of a target AM (modulation detection interference; MDI) in HI than NH listeners. This effect might be due to the exaggerated perceived modulation depth in HI listeners. There is also evidence that the modulation depth of amplitude envelope fluctuations will be reduced by dynamic range compression (often used in hearing aids). MDI should therefore be smaller with a compressed interferer, due to the reduced modulation depth of the interferer. However, Shen and Lentz (2010) showed the opposite result. Specifics of that study included a processor that resulted in some artifacts and somewhat extreme compression parameters. The present study uses a low-distortion compressor with a range of compression parameters to investigate the effect of compression representative of wearable aids on MDI. We will report the influence of input level (re: kneepoint) and attack/release time on MDI in NH and HI listeners.
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