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Related Experiment Videos

A cochlear nonlinear transmission-line model compatible with combination tone psychophysics

M Furst, J L Goldstein

    The Journal of the Acoustical Society of America
    |September 1, 1982
    PubMed
    Summary

    Human psychophysical data show combination tone (CT) phase changes with stimulus level, unlike animal data. A new cochlear model explains this difference, differentiating human and animal cochlear nonlinear responses.

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    Area of Science:

    • Auditory Neuroscience
    • Acoustics
    • Biophysics

    Background:

    • Human psychophysical measurements reveal combination tone (CT) phase decreases with stimulus level.
    • This contrasts with animal physiological data where CT phase is level-insensitive.
    • Existing models do not fully explain these differing observations.

    Purpose of the Study:

    • To quantitatively characterize the difference in cochlear nonlinear response between humans and animals.
    • To develop and validate a nonlinear transmission line model that accounts for human and animal data.
    • To elucidate the mechanisms behind stimulus-level-dependent CT phase in humans.

    Main Methods:

    • Developed two nonlinear cochlear transmission line models: Model A (animal) with nonlinear resistance, Model B (human) with nonlinear stiffness and mechanical loading.

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  • Solved nonlinear models in the time domain using simulation.
  • Compared model predictions with human psychophysical and animal physiological data on CT cancellation.

    • Main Results:

    • Both models predict response saturation at high stimulus amplitudes.
    • Model B predicts stimulus-level-dependent resonant frequency site on the basilar membrane, unlike Model A.
    • Model B accurately predicts human psychophysical CT cancellation data, while Model A predicts animal physiological data.

    Conclusions:

    • The distinct nonlinear elements in human (stiffness) and animal (resistance) cochleas explain differences in CT phase behavior.
    • The level-dependent shift in resonant frequency site in the human cochlear model is crucial for explaining psychophysical findings.
    • This modeling approach provides a framework for understanding cochlear nonlinearities and their impact on auditory perception.