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Cochlear implant coding with stochastic beamforming and suprathreshold stochastic resonance
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Stocks, Nigel G., Shulgin, Boris V., Holmes, Stephen D., Nikitin, Alexander and Morse, Robert P. (2009) Cochlear implant coding with stochastic beamforming and suprathreshold stochastic resonance. In: International Conference on Applied Nonlinear Dynamics, Poipu Beach, HI, September 24-27, 2007. Published in: Applications of Nonlinear Dynamics Model and Design of Complex Systems pp. 237-248. ISBN 978-3-540-85631-3. ISSN 1860-0832. doi:10.1007/978-3-540-85632-0_19
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Official URL: http://dx.doi.org/10.1007/978-3-540-85632-0_19
Abstract
Cochlear implants are prosthetic devices used to provide hearing to people who would otherwise be profoundly deaf. The deliberate addition of noise to the electrode signals can in principle increase the amount of information transmitted via an effect termed suprathreshold stochastic resonance (SSR). However, for SSR to occur the noise must be added in such a way so as to achieve, at least partial, independent stochastic activity across the nerve fibre population.
We are investigating the use of stochastic beamforming to achieve greater independence. The strategy involves presenting each electrode with a linear combination of independent Gaussian noise sources. Because the cochlea is filled with conductive salt solutions, the noise currents from the electrodes interact and the effective stimulus for each nerve fibre will therefore be a different weighted sum of the noise sources. We show that it is possible to get one independent point of excitation for each electrode. Also, we report for the first time, that stochastic beamforming lead to the observation of SSR in a cochlear implant.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QC Physics |
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| Divisions: | Faculty of Science > Engineering | ||||
| Series Name: | UNDERSTANDING COMPLEX SYSTEMS-SPRINGER COMPLEXITY | ||||
| Journal or Publication Title: | Applications of Nonlinear Dynamics Model and Design of Complex Systems | ||||
| Publisher: | Springer-Verlag Berlin | ||||
| ISBN: | 978-3-540-85631-3 | ||||
| ISSN: | 1860-0832 | ||||
| Editor: | In, V and Longhini, P and Palacious, A | ||||
| Official Date: | 2009 | ||||
| Dates: |
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| Number of Pages: | 12 | ||||
| Page Range: | pp. 237-248 | ||||
| DOI: | 10.1007/978-3-540-85632-0_19 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | International Conference on Applied Nonlinear Dynamics | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Poipu Beach, HI | ||||
| Date(s) of Event: | September 24-27, 2007 |
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