Advances in relating cochlear implant physiology and psychophysics [Abstract]
AuthorBruce, Ian C.; White, Mark W.; Irlicht, Laurence S.; O'Leary, Stephen J.; Clark, Graeme M.
Source TitleProgram & Abstracts of the 1999 Conference on Implantable Auditory Prostheses.
Document TypeConference Item
CitationsBruce, I. C., White, M. W., Irlicht, L. S., O'Leary, S. J., & Clark, G. M. (1999). Advances in relating cochlear implant physiology and psychophysics [Abstract]. In Program & Abstracts of the 1999 Conference on Implantable Auditory Prostheses, California.
Access StatusOpen Access
More than a decade has passed since apparent discrepancies between physiological and psychophysical thresholds in cochlear implant users were first pointed out. This incongruity has been largely ignored in the intervening time. In a recent series of studies we have undertaken to determine if the definition of threshold in physiological studies is the cause of these differences. Analysis of auditory nerve physiology indicates that fluctuations in the membrane potential are a significant source of stochastic activity (noise) in electrical stimulation, such that responses are best described by discharge probability as a function of stimulus intensity, rather than just a simple deterministic (zero-noise) threshold. We hypothesize that quite low discharge probabilities in individual fibers may be sufficient to account for psychophysical thresholds, if responses in a population of fibers are used in this task by higher auditory pathways.
Keywordsotolaryngology; psychophysical studies; electrical stimulation
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- Graeme Clark Collection