Marozeau, Jeremy

Mckay, Colette M.

It has often been argued that a main limitation of the cochlear implant is the spread of current induced by each electrode, which activates aninappropriately large range of sensory neurons. In order to reduce this spread, a new stimulation mode, the all-polar mode, was tested with 5participants. It was designed to activate all the electrodes simultaneously with appropriate current levels and polarities to recruit narrower regions of auditory nerves in the region of specific intra-cochlear electrode positions (denoted all-polar electrodes). In this study, the all-polar mode was compared to the current commercial stimulation mode: the monopolar mode. The participants were asked to judge the sound dissimilarity between pairs of 2-electrode stimuli that differed in the electrode positions and were presented in either monopolar or all-polar mode. The dissimilarity ratings were analysed using a multidimensional scaling technique and a threedimensional stimulus perceptual space was produced. For both modes, the first perceptual dimension was highly correlated with the average position of the electrical stimulation and the second dimension moderately correlated with the distance between the two electrodes. The monopolar and all-polar stimuli were separated by a third dimension, which may indicate that allpolar stimuli have a perceptual quality that differs from monopolar stimuli

Online Research Database In Technology

Perceptual space induced by cochlear implant all-polar stimulation mode - DTU Orbit(08/11/2017) Perceptual space induced by cochlear implant all-polar stimulation modeIt has often been argued that a main limitation of the cochlear implant is the spread of current induced by each electrode,which activates an inappropriately large range of sensory neurons. In order to reduce this spread, a new stimulation mode, the all-polarmode, was tested with 5 participants. It was designed to activate all the electrodes simultaneously with appropriate current levels and polarities torecruit narrower regions of auditory nerves in the region of specific intra-cochlear electrode positions (denoted all-polarelectrodes). In this study, the all-polar mode was compared to the current commercial stimulation mode: the monopolarmode. The participants were asked to judge the sound dissimilarity between pairs of 2-electrode stimuli that differed in theelectrode positions and were presented in either monopolar or all-polar mode. The dissimilarity ratings were analysedusing a multidimensional scaling technique and a threedimensional stimulus perceptual space was produced. For bothmodes, the first perceptual dimension was highly correlated with the average position of the electrical stimulation and thesecond dimension moderately correlated with the distance between the two electrodes. The monopolar and all-polarstimuli were separated by a third dimension, which may indicate that allpolar stimuli have a perceptual quality that differsfrom monopolar stimuli.  General informationState: PublishedOrganisations: Department of Electrical Engineering, Hearing Systems, The Bionics InstituteAuthors: Marozeau, J. (Intern), Mckay, C. M. (Ekstern)Number of pages: 7Pages: 333-339Publication date: 2015 Host publication informationTitle of host publication: Proceedings of ISAAR 2015Editors: Santurette, S., Dau, T., Dalsgaard, J. C., Tranebjærg, L., Andersen, T.ISBN (Print): 978-87-990013-5-4Main Research Area: Technical/natural sciencesConference: 5th International Symposium on Auditory and Audiological Research, Nyborg, Denmark, 26/08/2015 -26/08/2015Source: PublicationPreSubmissionSource-ID: 124208615Publication: Research - peer-review › Article in proceedings – Annual report year: 2016 

Perceptual space induced by cochlear implant all-polar stimulation mode

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Perceptual space induced by cochlear implant all-polar stimulation mode

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