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Cochlear Nonlinearities Implied by the Differences between Transient Onsets and Offsets to a Tone Burst

  • Kenneth R. Henry
  • Edwin R. Lewis
Part of the NATO ASI Series book series (NSSA)

Abstract

A trapezoidal tone burst (Figure 1) is equivalent to a sum of four ramp-modulated sinusoids. The response of any linearly operating spectral filter (or tuning structure) to a single ramp-modulated sinusoid is made up of two families of components: (a) for each natural frequency of the filter itself, a transient excitation equivalent to that which would have been produced by an impulse occurring precisely at the time of the onset corner of the ramp, and (b) with the same frequency as the stimulus, a step modulated sinusoid and a ramp modulated sinusoid, each beginning precisely at the time of the corner of the stimulus ramp. The amplitude of the transient excitation of each of the filter’s natural frequencies is directly proportional to the slope of the ramp and depends on the frequency of the stimulus relative to the natural frequency being excited (Lewis and Henry,’ 88). When the frequency of the stimulus sinusoid is close to or within the pass band of the filter, the transient excitations of the filter’s natural frequencies combine with the responses at the stimulus frequency to produce a “delayed” version of the input waveform. In that case, the transient excitations are manifested merely as the “delay” itself.

Keywords

Characteristic Frequency Tone Burst Auditory Nerve Fiber High Stimulus Intensity Stimulus Sinusoid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Fay, R.R. (1986) Frequency selectivity, adaptation, and suppression in goldfish auditory nerve fibers. In: Frequency Selectivity in Hearing (Eds.: Moore, B.C.J. and Patterson, R.D.) Plenum Press, New York, pp. 137–145.Google Scholar
  2. Geisler, C.D. and Sinex, D.G. (1982) Responses of primary auditory fibers to brief tone bursts. J. Acoust. Soc. Am. 72, 781–794.PubMedCrossRefGoogle Scholar
  3. Lewis, E.R. and Henry K.R. (1988) Time domain analysis of tone bursts and their responses. Submitted to Hearing Research.Google Scholar
  4. Rhode, W.S. and Smith, P.H. (1985) Characteristics of tone-pip response patterns in relationship to spontaneous rate in cat auditory nerve fibers. Hearing Res. 21, 91–95.Google Scholar
  5. Research supported in part by Grant 12359 from NINCDS, National Institutes of Health.Google Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Kenneth R. Henry
    • 1
  • Edwin R. Lewis
    • 1
    • 2
  1. 1.Department of PsychologyUniversity of CaliforniaDavisUSA
  2. 2.Electronics Research LaboratoryUniversity of CaliforniaBerkeleyUSA

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