Interaural bimodal pitch matching with two-formant vowels

François Guérit, Josef Chalupper, Sébastien Santurette, Iris Arweiler, Torsten Dau

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

For bimodal patients, with a hearing aid (HA) in one ear and a cochlear implant (CI) in the opposite ear, usually a default frequency-to-electrode map is used in the CI. This assumes that the human brain can adapt to interaural place-pitch mismatches. This “one-size-fits-all” method might be partly responsible for the large variability of individual bimodal benefit. Therefore, knowledge about the location of the electrode array is an important prerequisite for optimum fitting. Theoretically, the electrode location can be determined from CT-scans. However, these are often not available in audiological practice. Behavioral pitch matching between the two ears has also been suggested, but has been shown to be tedious and unreliable. Here, an alternative method using two-formant vowels was developed and tested with a vocoder system simulating different CI insertion depths. The hypothesis was that patients may more easily identify vowels than perform a classical pitch-matching task. A spectral shift is inferred by comparing vowel spaces, measured by presenting the first formant in the HA and the second either in the HA or the CI. Preliminary results suggest that pitch mismatches can be derived from such vowel spaces. In order to take auditory adaptation in individual patients into account, the method will be tested with CI patients with contralateral residual hearing.
Original languageEnglish
Title of host publicationProceedings of ISAAR 2013 : Auditory Plasticity – Listening with the Brain
EditorsTorsten Dau, Sebastien Santurette, J. C. Dalsgaard, L. Tranebjærg, T. Andersen, T. Poulsen
Number of pages8
Publication date2013
ISBN (Print)978 -8 7 -9 90013 -4-7
Publication statusPublished - 2013
EventInternational Symposium on Auditory and Audiological Research - Hotel Nyborg strand, Nyborg, Denmark
Duration: 28 Aug 201330 Aug 2013

Conference

ConferenceInternational Symposium on Auditory and Audiological Research
LocationHotel Nyborg strand
CountryDenmark
CityNyborg
Period28/08/201330/08/2013

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