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Related Experiment Videos

Multiple mechanosensory modalities influence development of auditory function.

Seth S Horowitz1, Leslie H Tanyu, Andrea Megela Simmons

  • 1Department of Psychology, Brown University, Providence, Rhode Island 02912, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 26, 2007
PubMed
Summary
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During frog metamorphosis, sensory development shifts. Neural sensitivity to underwater sound particle motion changes, relying more on the inner ear

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Sensory Physiology

Background:

  • Sensory development integrates multiple sensory inputs.
  • Metamorphic development in ranid frogs involves significant neural reorganization.
  • Auditory, vestibular, and lateral line systems undergo changes during amphibian metamorphosis.

Purpose of the Study:

  • To investigate the developmental trajectory of neural sensitivity to different sound components (particle motion vs. pressure).
  • To understand the neural basis of sensory compensation during metamorphic climax.
  • To determine the contribution of the saccule and lateral line to particle motion sensitivity.

Main Methods:

  • Electrophysiological recordings in the medial vestibular nucleus of ranid frogs.

Related Experiment Videos

  • Stimulation with underwater sound particle motion and pressure components.
  • Tracing neural projections using lipophilic dye from peripheral end organs to the dorsal medulla.

    • Main Results:

    • Neural sensitivity to underwater sound particle motion shows a distinct developmental trajectory compared to pressure sensitivity.
    • Medial vestibular nucleus cells exhibit best frequencies for particle motion shifting higher during metamorphic climax.
    • Saccular projections to the medial vestibular nucleus are stable, while lateral line projections degenerate during metamorphosis.

    Conclusions:

    • Continued sensitivity to particle motion, primarily via the saccule, may compensate for lost pressure wave sensitivity during the 'developmental deaf period'.
    • Early development relies on multimodal input for particle motion sensitivity, transitioning to saccular input alone.
    • This sensory shift is crucial for adapting to an amphibious lifestyle.