Coding of Amplitude-Modulated Tones in the Midbrain Auditory Region of the Frog

  • N. Bibikov
  • Oxana Gorodetscaya


Until recently it was generally accepted that the ability to reproduce temporal aspects of sounds deteriorated from the peripheral to central regions of the auditory pathway. This conclusion was made from experiments using gated tones and noises and from others dealing with sound waveform reproduction. But the investigation of response modulations produced by small amplitude modulations of sounds have shown that the situation is far more complicated. In auditory nerve fibers the frequency domain response functions for modulation are lowpass functions having cutoff frequencies in the range of 1000 Hz. Amplitude-modulated sounds with small amplitude modulation give rise to a modulation of a discharge rate in only a narrow range of sound intensities (Møller, 1981).


Inferior Colliculus Modulation Transfer Function Cochlear Nucleus Auditory Nerve Fiber Synchronization Index 
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  1. Bibikov, N., 1974, Encoding of the stimulus envelope in peripheral and central regions of the auditory system of the frog, Acustica, 31: 310–314.Google Scholar
  2. Møller, A., 1973, Statistical evaluation of the dynamic properties of cochlear nucleus units using stimuli modulated with pseudorandom noise, Brain Res., 57: 443–456.PubMedCrossRefGoogle Scholar
  3. Møller, A., 1974, Responses of units in the cochlear nucleus to amplitude-modulated tones, Exp. Neurol., 45: 104–117.CrossRefGoogle Scholar
  4. Møller, A., 1981, This volume. Schuller, G., 1979, Coding of small sinusoidal amplitude modulations in the inferior colliculus of “CF-FM” bat, Rhinolophus ferrumequinum, Exp. Brain Res., 34: 117–132.Google Scholar
  5. Viemeister, N., 1979, Temporal modulation transfer functions based upon modulation thresholds, J. Acoust. Soc. Am., 66: 1364–1380.PubMedCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • N. Bibikov
    • 1
  • Oxana Gorodetscaya
    • 1
  1. 1.Acoustical InstituteMoscowU.S.S.R.

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