A stimulation of spatio-temporal firing across auditory nerve fibres
AuthorCarter, T. D.; Irlicht, L. S.; Au, D.; Clark, Graeme M.
Source TitleProceedings of the Australian Neuroscience Society
University of Melbourne Author/sClark, Graeme
Document TypeConference Item
CitationsCarter, T. D., Irlicht, L. S., Au, D., & Clark, G. M. (1997). A stimulation of spatio-temporal firing across auditory nerve fibres. In Proceedings of the Australian Neuroscience Society, Newcastle.
Access StatusOpen Access
This is an abstract of a paper from Proceedings of the Australian Neuroscience Society 1997 published by Australian Neuroscience Society. This version is reproduced with the permission of publisher.
Present cochlear implant speech processing strategies give recipients a perception of sound inferior to that of the normal hearing population. Since it is beyond current technology to achieve an electrically evoked auditory-nerve output identical to that of normal hearing, stimulation strategies are limited to approximating certain features of the neural firing patterns. The importance of the spatio-temporal firing patterns of an ensemble of auditory nerve fibres to speech perception has been stated in previous studies (1,2). This paper utilises a composite model of the cochlea and hair-cell/auditory nerve transduction using artificial and speech signals as input to produce a spatio-temporal excitation pattern which represents the fluctuating firing probability of the auditory neurons. A model of electrical stimulation of the auditory nerve is then used to show how stimulation strategies currently used produce neural firing patterns qualitatively different to those produced by normal hearing. Our investigations indicate that it is possible to generate electrical stimulation parameters that cause the spatio-temporal responses of the neural population to better approximate normal hearing. These responses enable us to identify stimulation parameters required to obtain the chosen neural firing patterns. A number of examples illustrate the utility of this method, revealing the spatio-temporal responses for varying numbers of neurons and electrode displacements.
Keywordsotolaryngology; otology; speech processing; electrical stimulation
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