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Related Experiment Videos

Postmetamorphic changes in auditory sensitivity of the bullfrog midbrain

S S Boatright-Horowitz1, A M Simmons

  • 1Department of Neuroscience, Brown University, Providence, RI 02912, USA.

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|November 1, 1995
PubMed
Summary

Newly metamorphosed frogs (Rana catesbeiana) gain hearing sensitivity within 24 hours, primarily due to peripheral auditory system maturation, not central changes.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory System Research

Background:

  • Ranid frogs undergo metamorphosis, replacing the lateral line system with an auditory system for airborne sound detection.
  • The central auditory system's development and functional onset are crucial for understanding this sensory transition.

Purpose of the Study:

  • To investigate the functional onset and developmental changes in the bullfrog's central auditory system post-metamorphosis.
  • To determine whether peripheral or central auditory system maturation limits the development of hearing sensitivity.

Main Methods:

  • Recorded multi-unit activity from the principal nucleus of the torus semicircularis (TSp) in bullfrogs at various postmetamorphic stages.
  • Presented tympanically-presented auditory stimuli to assess auditory responses and audiograms.

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  • Analyzed changes in the TSp's volume, cell density, and nuclear organization.

    • Main Results:

    • Auditory responses were detected within 24 hours post-metamorphosis, despite no response in late-stage tadpoles.
    • Audiograms in young froglets showed high thresholds and a decreasing most sensitive frequency (MSF) from 2500 Hz to 1500 Hz.
    • Larger frogs exhibited shifts in MSF and thresholds, with increased sharpness, approaching adult values; TSp volume increased by 50%.

    Conclusions:

    • The onset of hearing sensitivity to airborne sounds in bullfrogs is primarily limited by peripheral auditory system maturation.
    • Central auditory system structures like the TSp undergo significant development and volume increase post-metamorphosis.