A stochastic model of the electrically stimulated auditory nerve: Pulse-train response

Lan C. Bruce*, Laurence S. Irlicht, Mark W. White, Stephen J. O'Leary, Scott Dynes, Eric Javel, Graeme M. Clark

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


The single-pulse model of the companion paper [1] is extended to describe responses to pulse trains by introducing a phenomenological refractory mechanism. Comparisons with physiological data from cat auditory nerve fibers are made for pulse rates between 100 and 800 pulses/s. First, it is shown that both the shape and slope of mean discharge rate curves are better predicted by the stochastic model than by the deterministic model. Second, while interpulse effects such as refractory effects do indeed increase the dynamic range at higher pulse rates, both the physiological data and the model indicate that much of the dynamic range for pulse-train stimuli is due to stochastic activity. Third, it is shown that the stochastic model is able to predict the general magnitude and behavior of variance in discharge rate as a function of pulse rate, while the deterministic model predicts no variance at all.

Original languageEnglish
Pages (from-to)630-637
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Issue number6
Publication statusPublished - 1999
Externally publishedYes


  • Auditory nerve
  • Cochlear implant
  • Functional electrical stimulation
  • Population response
  • Pulse-train response
  • Refractory effect
  • Renewal process
  • Sensory prosthesis
  • Stochastic model


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