Journal article
Changes Across Time in Spike Rate and Spike Amplitude of Auditory Nerve Fibers Stimulated by Electric Pulse Trains
Journal of the Association for Research in Otolaryngology, Vol.8(3), pp.356-372
09/01/2007
DOI: 10.1007/s10162-007-0086-7
PMCID: PMC2538432
PMID: 17562109
Abstract
We undertook a systematic evaluation of spike rates and spike amplitudes of auditory nerve fiber (ANF) responses to trains of electric current pulses. Measures were obtained from acutely deafened cats to examine time-related changes free from the effects of hair-cell and synaptic adaptation. Such data relate to adaptation that likely occurs in ANFs of cochlear-implant users. A major goal was to determine and compare rate adaptation observed at different pulse rates (primarily 250, 1000, and 5000 pulse/s) and describe them using decaying exponential models similar to those used in acoustic studies. Rate-vs.-time functions were best described by two-exponent models and produced time constants similar to (although slightly greater than) the “rapid” and “short-term” components described in acoustic studies. There was little dependence of these time constants on onset spike rate, but pulse-rate effects were noted. Spike amplitude changes followed a time course different from that of rate adaptation consistent with a process related to ANF interspike intervals. The fact that two time constants governed rate adaptation in electrically stimulated and deafened fibers suggests that future computational models of adaptation should not only include hair cell and synapse components, but also components determined by fiber membrane characteristics.
Details
- Title: Subtitle
- Changes Across Time in Spike Rate and Spike Amplitude of Auditory Nerve Fibers Stimulated by Electric Pulse Trains
- Creators
- Fawen Zhang - University of IowaCharles A. Miller - University of IowaBarbara K. Robinson - University of IowaPaul J. Abbas - University of IowaNing Hu - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of the Association for Research in Otolaryngology, Vol.8(3), pp.356-372
- Publisher
- Springer-Verlag
- DOI
- 10.1007/s10162-007-0086-7
- PMID
- 17562109
- PMCID
- PMC2538432
- ISSN
- 1525-3961
- eISSN
- 1438-7573
- Language
- English
- Date published
- 09/01/2007
- Academic Unit
- Biology; Otolaryngology
- Record Identifier
- 9984383294602771
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