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Updated: Jan 27, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Fully objective hearing threshold estimation in cochlear implant users using phase-locking value growth functions
Darren Mao1, Hamish Innes-Brown2, Matthew A Petoe2
1Department of Biomedical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia.
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).
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