Zoest, Sil M. van (2026) Investigating pitch perception for cochlear implant users with perimodiolar electrode arrays and dual-electrode stimulation. Master's Internship Report, Biomedical Engineering.
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Abstract
Background: Currently, the increased number of pitch percepts as provided by dual-electrode stimulation is not accessible for most cochlear implant users users. A likely limiting factor is spread of excitation as a result of current spread in the cochlea. Perimodiolar arrays reduce the width of electrically evoked compound action potential masking functions, induce a narrower excitation width in model studies and are shown to increase electrode pitch ranking scores. It follows that perimodiolar arrays could potentially increase the number of pitch percepts as provided by dual-electrode stimulation by increasing the separation of close excitation profiles in dual electrode stimulation. Methods: To investigate if this is the case the computational model as developed by the Frijns group was used to obtain the modelled neural response for different virtual channel stimulations at different electrode positions. Then, the width at half maximum from the excitation profiles and the overlap in excitation for different virtual channels were calculated. Results: Perimodiolar electrodes show reduced excitation widths at virtual channels near single-electrode stimulation, but this effect is almost completely nullified at virtual channels in between two electrodes. Perimodiolar electrodes also show no reduced overlap for neighbouring channels compared to lateral electrodes. Conclusion: Dual electrode stimulation counteracts the smaller excitation width as provided by perimodiolar arrays.
| Item Type: | Thesis (Master's Internship Report) |
|---|---|
| Supervisor name: | Maat, A. |
| Degree programme: | Biomedical Engineering |
| Thesis type: | Master's Internship Report |
| Language: | English |
| Date Deposited: | 03 Jul 2026 13:41 |
| Last Modified: | 03 Jul 2026 13:41 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/37330 |
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