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Related Experiment Videos

Rhythmic spontaneous activity in the developing avian auditory system

W R Lippe1

  • 1Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington School of Medicine, Seattle 98195.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 1, 1994
PubMed
Summary

Spontaneous rhythmic bursting in the embryonic chick auditory system, originating from the cochlea, shifts to steady firing before hatching. This patterned activity may guide auditory neuron development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory System Research

Background:

  • The embryonic chick auditory system, specifically nucleus magnocellularis (NM) and nucleus laminaris (NL), exhibits spontaneous neural activity.
  • Understanding this early activity is crucial for comprehending auditory pathway development.

Purpose of the Study:

  • To investigate the characteristics and origin of spontaneous neural firing in the embryonic chick auditory system.
  • To determine the functional significance of patterned spontaneous activity during development.

Main Methods:

  • Microelectrode recordings of spontaneous multiple unit activity in NM and NL of chick embryos (E14-E19).
  • Analysis of firing patterns, interburst intervals, and response to auditory stimulation and cochlea removal.

Related Experiment Videos

  • Pharmacological blockade of auditory nerve activity using TTX.

    • Main Results:

    • Embryonic chick auditory nuclei (NM, NL) displayed synchronous, rhythmic bursting from E14-E18, originating from the auditory nerve.
    • Interburst intervals decreased with development, and bursting transitioned to steady, unpatterned firing by E19.
    • Auditory nerve activity, likely cochlear, was essential for this patterned bursting, which could be modulated by sound.

    Conclusions:

    • Spontaneous rhythmic bursting in the embryonic chick auditory pathway reflects normal physiological activity, primarily of cochlear origin.
    • This patterned activity, similar to mammalian visual pathways, may play a role in the structural and functional development of auditory neurons.
    • The findings suggest a potential general principle for early sensory system development involving patterned spontaneous activity.