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Related Experiment Videos

One-tone suppression in the frog auditory nerve

J Christensen-Dalsgaard1, M B Jørgensen

  • 1Center for Sound Communication, Odense University, Denmark.

The Journal of the Acoustical Society of America
|July 1, 1996
PubMed
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In grassfrogs, auditory nerve fibers exhibit one-tone suppression, a phenomenon where spontaneous activity is reduced by specific sound frequencies. This newly observed mechanism is widespread in low-frequency auditory fibers.

Area of Science:

  • Auditory Neuroscience
  • Animal Physiology
  • Bioacoustics

Background:

  • The auditory nerve transmits sound information from the inner ear to the brain.
  • Auditory nerve fibers exhibit varied responses to sound stimuli, including spontaneous activity.
  • One-tone suppression, where a sound reduces spontaneous activity, is a known auditory phenomenon but not previously reported in frogs.

Purpose of the Study:

  • To investigate the occurrence and characteristics of one-tone suppression in the auditory nerve of grassfrogs (Rana temporaria).
  • To determine the prevalence of this phenomenon in fibers originating from the amphibian papilla.
  • To characterize the best frequencies and spontaneous activity levels associated with one-tone suppression.

Main Methods:

  • Electrophysiological recordings were performed on single auditory nerve fibers in grassfrogs.

Related Experiment Videos

  • Fibers were classified based on their best frequencies and spontaneous activity.
  • The effect of pure tones on spontaneous firing rates was measured to identify one-tone suppression.

    • Main Results:

    • Sixty-seven out of 401 auditory nerve fibers (16.7%) displayed one-tone suppression.
    • All suppressed fibers originated from the amphibian papilla and had best frequencies between 100 and 400 Hz.
    • Best suppression frequencies ranged from 700 to 1200 Hz, and spontaneous activities ranged from 3 to 75 spikes/s.
    • Spontaneous activities exceeding 40 spikes/s and one-tone suppression were novel findings in frogs.
    • The phenomenon was observed in 81% of fibers with best frequencies below 400 Hz and spontaneous activity above 3 spikes/s.

    Conclusions:

    • One-tone suppression is a prevalent mechanism in the grassfrog auditory system, particularly in low-frequency sensitive fibers.
    • The high prevalence suggests a general underlying neural mechanism.
    • These findings expand our understanding of auditory processing in amphibians.