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Related Experiment Videos

The auditory neurophonic: basic properties.

R L Snyder, C E Schreiner

    Hearing Research
    |September 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Auditory neurophonic signals, including the auditory nerve neurophonic (ANN) and frequency following response (FFR), are primarily neural in origin, distinct from cochlear microphonics (CM). These responses reflect spatial summation of auditory nerve activity.

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    Area of Science:

    • Auditory Neuroscience
    • Neurophysiology
    • Acoustics

    Background:

    • Auditory neurophonics, including the auditory nerve neurophonic (ANN) and frequency following response (FFR), can be recorded from cats during low-frequency auditory stimulation.
    • These signals are distinct from the cochlear microphonic (CM) and share properties with single auditory nerve units.

    Purpose of the Study:

    • To investigate the fundamental properties of auditory neurophonics.
    • To differentiate the neural origins of ANN and FFR from the CM.
    • To relate neurophonic properties to phase-locked activity in the auditory nerve.

    Main Methods:

    • Differential recording of the ANN using platinum-iridium electrodes on the auditory nerve.
    • Recording of the FFR from the scalp using silver wire.

    Related Experiment Videos

  • Comparison with round window-recorded CM under identical acoustic stimulation conditions.
  • Main Results:

    • Neurophonic responses (ANN and FFR) were found to be distinct from CM across various measures (amplitude, spectral components, frequency, time, masking).
    • Micro-injections of kainic acid into the cochlear nucleus had minimal effect on neurophonics.
    • Tetrodotoxin injections into the cochlea significantly reduced neurophonic responses while largely sparing the CM.

    Conclusions:

    • Below 90 dB SPL, the ANN is predominantly neural, and the FFR is largely neural, both distinct from CM.
    • Auditory neurophonics represent a spatial summation of neural activity in the auditory nerve.
    • These responses likely arise from phase-locked activity of single auditory nerve units to low-frequency stimuli.