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Fully objective hearing threshold estimation in cochlear implant users using phase-locking value growth functions.
Mao, Darren; Innes-Brown, Hamish; Petoe, Matthew A; Wong, Yan T; McKay, Colette M.
Affiliation
  • Mao D; Department of Biomedical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia. Electronic address: DMao@bionicsinstitute.org.
  • Innes-Brown H; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia; Department of Medical Bionics, University of Melbourne, Parkville, VIC, 3010, Australia.
  • Petoe MA; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia; Department of Medical Bionics, University of Melbourne, Parkville, VIC, 3010, Australia.
  • Wong YT; Department of Biomedical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia; Department of Physiology, Department of Electrical and Computer Systems Engineering, and the Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3168, Australia.
  • McKay CM; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia; Department of Medical Bionics, University of Melbourne, Parkville, VIC, 3010, Australia.
Hear Res ; 377: 24-33, 2019 06.
Article in En | MEDLINE | ID: mdl-30884368
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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Full text: 1 Database: MEDLINE Main subject: Auditory Threshold / Cochlear Implants / Prosthesis Fitting / Persons With Hearing Impairments / Cochlear Implantation / Electroencephalography / Evoked Potentials, Auditory / Loudness Perception Type of study: Prognostic_studies Language: En Journal: Hear Res Year: 2019 Type: Article
Fulltext
Add to My VHL
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PubMed Links
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Full text: 1 Database: MEDLINE Main subject: Auditory Threshold / Cochlear Implants / Prosthesis Fitting / Persons With Hearing Impairments / Cochlear Implantation / Electroencephalography / Evoked Potentials, Auditory / Loudness Perception Type of study: Prognostic_studies Language: En Journal: Hear Res Year: 2019 Type: Article