Perceptual interactions between electrodes using focused and monopolar cochlear stimulation

Journal of the Association for Research in Otolaryngology : JARO
Jeremy MarozeauC M McKay

Abstract

In today's cochlear implant (CI) systems, the monopolar (MP) electrode configuration is the most commonly used stimulation mode, requiring only a single current source. However, with an implant that will allow simultaneous activation of multiple independent current sources, it is possible to implement an all-polar (AP) stimulation mode designed to create a focused electrical field. The goal of this experiment was to study the potential benefits of this all-polar mode for reducing uncontrolled electrode interactions compared with the monopolar mode. The five participants who took part in the study were implanted with a research device that was connected via a percutaneous connector to a benchtop stimulator providing 22 independent current sources. The perceptual effects of the AP mode were tested in three experiments. In Experiment 1, the current level difference between loudness-matched sequential and simultaneous stimuli composed of 2 spatially separated pulse trains was measured as function of the electrode separation. Results indicated a strong current-summation interaction for simultaneous stimuli in the MP mode for separations up to at least 4.8 mm. No significant interaction was found in the AP mode beyond a separation of...Continue Reading

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Citations

Sep 9, 2016·Trends in Hearing·Jeremy Marozeau, Colette M McKay
Jun 14, 2017·Journal of Neural Engineering·Robert K ShepherdJames B Fallon
Oct 17, 2017·Cochlear Implants International·Alistair Mitchell-InnesRobert Briggs
Jul 4, 2018·Journal of Neural Engineering·P SennJ B Fallon
Dec 14, 2018·Journal of Neural Engineering·Quentin MesnildreyFrédéric Venail
Apr 3, 2015·Journal of Neural Engineering·Shefin S GeorgeRobert K Shepherd
Mar 17, 2017·Ear and Hearing·Dirk VellingaJohannes Hubertus Maria Frijns
Sep 25, 2015·Journal of Neural Engineering·Shefin S GeorgeJames B Fallon
Jul 30, 2017·Journal of the Association for Research in Otolaryngology : JARO·Robert P CarlyonAstrid van Wieringen
Jan 26, 2021·Journal of the Association for Research in Otolaryngology : JARO·Robert P CarlyonManohar Bance
Feb 2, 2021·Frontiers in Psychology·Colette M McKay
Apr 24, 2021·Journal of the Association for Research in Otolaryngology : JARO·Charlotte GarciaRobert P Carlyon
Dec 23, 2021·Trends in Hearing·Charlotte Amalie NavntoftJeremy Marozeau

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