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.

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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
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
Date:	2009
Number of Pages:	12
Page Range:	pp. 237-248
Identification Number:	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
URI:	http://wrap.warwick.ac.uk/id/eprint/28228

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