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Related Experiment Videos

Acoustic trauma: single neuron basis for the "half-octave shift"

A R Cody, B M Johnstone

    The Journal of the Acoustical Society of America
    |September 1, 1981
    PubMed
    Summary

    Temporary threshold shift (TTS) causes temporary hearing loss after loud noise exposure. A specific frequency, half an octave below the characteristic frequency, is most effective in causing this hearing desensitization.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Hearing Science

    Background:

    • Exposure to intense sound can cause temporary threshold shift (TTS), a reversible loss of hearing sensitivity.
    • TTS manifests as reduced sensitivity at a neuron's characteristic frequency (CF).

    Purpose of the Study:

    • To investigate the frequency-specific characteristics of temporary threshold shift (TTS) at the auditory neuron level.
    • To determine the relationship between exposure frequency and the induction of TTS relative to the characteristic frequency (CF).

    Main Methods:

    • Monitored TTS as a loss of sensitivity at the characteristic frequency (CF) of single auditory neurons.
    • Presented pure-tone exposures at various frequency intervals relative to the neuron's CF.

    Main Results:

    • Exposure frequencies half an octave below the CF were most effective in inducing TTS.
    • Higher exposure frequencies showed a reduced TTS growth with intensity compared to lower frequencies.
    • A distinct "half-octave shift" in TTS induction was observed, suggesting a link to basilar membrane mechanics.

    Conclusions:

    • The frequency-specific pattern of TTS induction, particularly the half-octave effect, aligns with known mechanical and neural nonlinearities in the auditory system.
    • Basilar membrane nonlinearities are likely responsible for the observed half-octave shift in TTS induction.

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