Spread of excitation varies for different electrical pulse shapes and stimulation modes in cochlear implants.

Hearing Research
Jaime A UndurragaAstrid van Wieringen

Abstract

In cochlear implants (CI) bipolar (BP) electrical stimulation has been suggested as a method to reduce the spread of current along the cochlea. However, behavioral measurements in BP mode have shown either similar or worse performance than in monopolar (MP) mode. This could be explained by a bimodal excitation pattern, with two main excitation peaks at the sites of the stimulating electrodes. We measured the spread of excitation (SOE) by means of the electrically evoked compound action potential (ECAP), obtained using the forward-masked paradigm. The aim was to measure the bimodality of the excitation and to determine whether it could be reduced by using asymmetric pulses. Three types of maskers shapes were used: symmetric (SYM), pseudomonophasic (PS), and symmetric with a long inter-phase gap (SYM-IPG) pulses. Maskers were presented in BP + 9 (wide), BP + 3 (narrow) and MP (only SYM) mode on fixed electrodes. The SOE obtained with the MP masker showed a main excitation peak close to the masker electrode. Wide SYM maskers produced bimodal excitation patterns showing two peaks close to the electrodes of the masker channel, whereas SYM-IPG maskers showed a single main peak near the electrode for which the masker's second phase (r...Continue Reading

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Citations

Jul 19, 2013·The Journal of the Acoustical Society of America·Robert P CarlyonOlivier Macherey
Mar 13, 2013·Journal of the Association for Research in Otolaryngology : JARO·Jaime A UndurragaAstrid van Wieringen
Nov 12, 2019·Neuromodulation : Journal of the International Neuromodulation Society·Phillip TranFan-Gang Zeng
Jul 12, 2017·Frontiers in Neuroscience·Shuman HeCraig A Buchman
Feb 2, 2019·Journal of the Association for Research in Otolaryngology : JARO·Emily R SpitzerMichelle L Hughes
Feb 26, 2020·Scientific Reports·Charlotte Amalie NavntoftTania Rinaldi Barkat
Jul 30, 2017·Journal of the Association for Research in Otolaryngology : JARO·Robert P CarlyonAstrid van Wieringen
Jan 19, 2021·Hearing Research·Jaime A UndurragaDeborah Vickers
Feb 9, 2020·Hearing Research·Sonia TabibiNorbert Dillier
Feb 2, 2021·Frontiers in Psychology·Colette M McKay
May 7, 2021·Journal of Neuroscience Methods·Sonia TabibiIan C Bruce
May 27, 2021·Brazilian Journal of Otorhinolaryngology·Fabiana DanieliMiguel Angelo Hyppolito

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