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Title: Fully objective hearing threshold estimation in cochlear implant users using phase-locking value growth functions
Authors: Mao, Darren
Innes-Brown, Hamish
Petoe, Matthew
Wong, Yan
McKay, Colette
Keywords: Cochlear implant
Electrical dynamic range
Objective threshold estimation
Phase-locking value
Cortical response
Issue Date: Mar-2019
Publisher: Elsevier B.V.
Citation: Mao, D., H. Innes-Brown, M. A. Petoe, Y. T. Wong, and C. M. McKay. 2019. Fully objective hearing threshold estimation in cochlear implant users using phase-locking value growth functions. Hearing Research. 377: 24-33.
Abstract: Cochlear implant users require fitting of electrical threshold and comfort levels for optimal access to sound. In this study, we used single-channel cortical auditory evoked responses (CAEPs) obtained from 20 participants using a Nucleus device. A fully objective method to estimate threshold levels was developed, using growth function fitting and the peak phase-locking value feature. Results demonstrated that growth function fitting is a viable method for estimating threshold levels in cochlear implant users, with a strong correlation (r=0.979, p<0.001) with behavioral thresholds. Additionally, we compared the threshold estimates using CAEPs acquired from a standard montage (Cz to mastoid) against using a montage of recording channels near the cochlear implant, simulating recording from the device itself. The correlation between estimated and behavioural thresholds remained strong (r=0.966, p<0.001), however the recording time needed to be increased to produce a similar estimate accuracy. Finally, a method for estimating comfort levels was investigated, and showed that the comfort level estimates were mildly correlated with behavioral comfort levels (r=0.50, p=0.024).
URI: http://repository.bionicsinstitute.org:8080/handle/123456789/389
ISSN: 0378-5955
Appears in Collections:Bionic Hearing Research Publications

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