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Related Experiment Videos

Coherence of frequency modulation is encoded by cochlear-generated distortion.

K I McAnally1, M B Calford

  • 1Department of Physiology and Pharmacology, University of Queensland, Australia.

Hearing Research
|March 1, 1992
PubMed
Summary

The auditory system detects frequency modulation coherence using distortion product amplitude. Minor deviations from coherent frequency modulation cause amplitude changes, indicating sensitivity to these auditory signal variations.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Bioacoustics

Background:

  • Peripheral auditory nonlinearities generate distortion products, perceived as acoustic stimuli by the central auditory system.
  • Distortion product frequency and amplitude depend on the stimulus's frequency, phase, and amplitude relationships.
  • Harmonically related tones produce distortion product amplitudes influenced by the relative phase of the primary tones.

Purpose of the Study:

  • To investigate if the auditory system encodes frequency modulation coherence in distortion product amplitude.
  • To examine the relationship between frequency modulation coherence and distortion product amplitude in the peripheral auditory system.

Main Methods:

  • Measurements of cochlear microphonic potential (CM) in anesthetized cats.

Related Experiment Videos

  • Recordings of auditory nerve fiber responses in anesthetized cats.
  • Analysis of distortion product amplitude variations in response to frequency-modulated tones.

    • Main Results:

    • Small deviations from coherent frequency modulation caused changes in CM amplitude at the distortion frequency.
    • Auditory nerve fibers responded with modulated discharges at the distortion frequency, mirroring CM amplitude changes.
    • Coherent frequency modulation of primary tones did not alter CM distortion amplitude or modulate auditory nerve discharges.

    Conclusions:

    • Amplitude modulation of distortion products appears to be a mechanism for the auditory system's sensitivity to minor departures from frequency modulation coherence.
    • This mechanism allows the auditory system to detect subtle deviations in harmonically related, frequency-modulated tones.