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Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

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Recording the Neural Response while stimulating with a high rate burst

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  • corresponding author A. Büchner - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany
  • C. Frohne-Büchner - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany
  • M. Brendel - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany
  • S. Pilsak - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany
  • R.D. Battmer - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany
  • T. Lenarz - Department of Otolaryngology, Medizinische Hochschule Hannover, Germany

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci026

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/omci2005/05omci026.shtml

Published: May 31, 2005

© 2005 Büchner et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

Text

Introduction

The introduction of relatively high stimulation rates (above 1500pps) encouraged the discussion about a stochastic response pattern of the auditory nerve. If it is the case that it is really true that the individual fibres cannot follow a high stimulation rate then a tuning process should occur at the onset of a burst. This process should be visible if the neural response is recorded in response to bursts of different numbers of pulses.

Materials and Methods

The research software "Bionics Ear Data Collections System" for the Advanced Bionics implants CII and Hires90K allows neural response imaging (NRI) recordings to be made with flexible stimulation patterns. It was used within a study to stimulate with a burst while recording the neural response. The burst length was varied from one to 20 pulses. The pulse width of the burst was varied between 10.8µs and 60.2µs.

Results

The response decreases with increasing number of pulses in the burst. This decrease is not monotonic but shows some oscillating effect, e.g. an odd number of pulses leads to a bigger response than an even number. Preliminary results show individual differences in the slope of the decrease with increased number of pulses. In addition the slope is rate dependent at least in some subjects. Data on a bigger study group will be presented.

Conclusions

It could be shown that NRI can be recorded in response to a stimulating burst. Further investigations will be necessary to look for correlations between individual differences in the response pattern and the optimal rate used in the speech processor program.