Auditory steady state responses in cochlear implants

Authors

  • Jan Wouters ExpORL, Dept. Neurosciences, K.U.Leuven, Belgium
  • Michael Hofmann ExpORL, Dept. Neurosciences, K.U.Leuven, Belgium

Abstract

Electrically Auditory Steady State Responses (EASSRs) are EEG potentials in response to periodic electrical stimuli presented through a cochlear implant (CI). Recently, for slow rate pulse trains in the 40Hz range, the electrophysiological thresholds derived from response amplitude growth functions have been demonstrated to correlate well with behavioral thresholds at these rates. In the following studies we show that auditory steady state potentials can as well be reliably evoked by amplitude- modulated or pulse-width-modulated high-rate pulse trains at clinically used carrier rates, and that stimulus artifacts can be completely removed from the electrophysiological recordings. Multichannel EEG-data have been recorded in Nucleus cochlear implant users. The properties of the resulting responses with regards to amplitude, phase and apparent latency are analyzed. The predictive value of electrophysiological thresholds derived from such responses for behavioral thresholds at these high rates is examined. This objective threshold determination method may be used in future CI fitting paradigms.

References

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Additional Files

Published

2011-12-15

How to Cite

Wouters, J., & Hofmann, M. (2011). Auditory steady state responses in cochlear implants. Proceedings of the International Symposium on Auditory and Audiological Research, 3, 243–250. Retrieved from https://proceedings.isaar.eu/index.php/isaarproc/article/view/2011-29

Issue

Vol. 3 (2011): Speech Perception and Auditory Disorders

Section

2011/2. Neural representation of complex sounds and speech in the auditory brain

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