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Comparative Study
. 2017 Dec;142(6):EL561.
doi: 10.1121/1.5017530.

Effect of carrier bandwidth on integration of simulations of acoustic and electric hearing within or across ears

Qian-Jie Fu  1 , John J Galvin 3rd  1 , Xiaosong Wang  1
Affiliations
Comparative Study

Effect of carrier bandwidth on integration of simulations of acoustic and electric hearing within or across ears

Qian-Jie Fu et al. J Acoust Soc Am. 2017 Dec.

Abstract

Differences in current spread and/or spread of excitation may differently affect integration of acoustic and electric hearing within (electric-acoustic stimulation, or EAS) or across ears (bimodal). In this study, vowel recognition was measured in normal-hearing subjects listening to simulations of cochlear implant (CI), EAS, and bimodal listening. Residual acoustic hearing was limited between 0.1 and 0.6 kHz. The carrier bandwidth in the CI simulations was varied across carriers: broad-band noise, narrow-band noise, and sine waves. Results showed that reducing the bandwidth (and the inherent noise fluctuations) in the CI simulations significantly affected CI-only and bimodal performance, but not EAS performance.

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Figures

Fig. 1.
Fig. 1.
(Color online) Spectral envelopes for the steady portion of the vowels “heed” (left column) and “had” (right column). The dotted lines show the original spectral envelope. The dashed lines show the spectral envelope for the simulated residual AH. The solid lines show the spectral envelope for the CI simulations with the different carriers.
Fig. 2.
Fig. 2.
Mean percent correct for overall vowel recognition, and perception of F1, F2, and duration cues, as a function of carrier type used in the CI simulations. The dashed lines show with AH-only performance. The error bars show the standard error of the mean.
See this image and copyright information in PMC

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