Article

Exponential Fitting of Spread of Excitation Curves in Cochlear Implants (en)

Authors

* Presenting author
Day / Time: 07.03.2023, 16:40-17:00
Room: Saal Y5
Typ: Regulärer Vortrag
Session: Audiologische Akustik 2 - Cochlea-Implantante und Hohlräume A
Abstract: The goal of this study was to examine the spread of neural excitation (SoE) in cochlear implants (CIs). Spread of Excitation (SoE) curves were measured using the using electrically evoked compound action potentials (ECAPs), recorded with a spatial forward-masking paradigm. For 17 patients, SoE profiles were measured at three locations, apical (electrode 3), medial (electrode 6) and basal (electrode 9). The SoE profiles classified with an analyzable response were fitted with two exponential functions for the apical and basal side respectively. Asymmetric SoE with measures, scaled for the apical and basal side separately, were used to parametrize the fitted curves. Significant di_erences between apical and basal distance measures were found for the apical and basal probe electrode (apical: di_erence in medians = 1.32 mm, Wilcoxon-test z = -2.46, p = .014, r = .55; basal: di_erence in medians = 0.62 mm, Wilcoxon-test z = -2.31, p = .021, r = .52), but not for the medial probe electrode. The basal distance measure was also found to significantly differ between recording sites. Further aim is to see whether these measures extracted from the parametrized SoEs arerelated to psychophysical measures like speech perception.
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