J. Acoust

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  Available from: psu.edu

  Article: Physiologically Based Predictions of Psychophysical Threshold, Dynamic Range and Intensity Difference Limen in Mammalian Cochlear Implant Subjects

  Stephen J O'Leary, Preprint Resubmitted, J. Acoust, Soc Am. ---july, Ian C. Bruce, Mark W. White, Laurence S. Irlicht, Graeme M Clark
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  ABSTRACT: In [Bruce et al., IEEE Trans. Biomed. Eng. 46, 1393--1404 (1999b)], a composite physiological /psychophysical model of cochlear implant stimulation was developed to investigate whether inclusion of physiologically-observed stochastic activity in the auditory nerve (AN) section improves predictions of psychophysical data from human cochlear implant users. It was shown that the stochastic version of the model better predicts how psychophysical threshold and uncomfortable loudness vary with two model parameters that directly affect single fiber responses, stimulus phase duration and electrode configuration. In this paper, the hypothesis is investigated that the major properties of such psychophysical data are consistent across mammalian species and can be well understood from the basic physiological properties of the mammalian AN if stochastic activity is considered. In addition to the psychophysical measures of the previous study, the investigation is extended to intensity discrimination...
  08/2000;