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Related Experiment Videos

Development of the place principle.

E W Rubel, W R Lippe, B M Ryals

    The Annals of Otology, Rhinology, and Laryngology
    |November 1, 1984
    PubMed
    Summary

    Hearing development in chickens shows frequency representation shifts along the basilar membrane. As chickens mature, specific sound frequencies activate progressively different areas of the cochlea, revealing a developmental process.

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    Area of Science:

    • Auditory Neuroscience
    • Developmental Biology
    • Ototoxicology

    Background:

    • The tonotopic organization of the basilar membrane is crucial for auditory processing.
    • Understanding the developmental trajectory of this organization is key to comprehending hearing maturation.

    Purpose of the Study:

    • To investigate the developmental changes in frequency representation along the basilar membrane in chickens.
    • To examine how auditory system maturation impacts the tonotopic map.

    Main Methods:

    • Experiment 1: Exposure of embryonic and hatchling chickens to pure tones to assess hair cell degeneration patterns.
    • Experiment 2: Microelectrode recordings in the brainstem auditory nuclei of chickens at different developmental stages (embryonic, hatchling, adult).

    Main Results:

    • Hair cell damage patterns shifted apically with maturation, indicating a developmental change in frequency mapping.
    • Auditory neurons showed a systematic shift in frequency tuning, with high-frequency neurons initially responding to low frequencies in younger animals.

    Conclusions:

    • The mature tonotopic map along the basilar membrane gradually emerges during auditory development.
    • These findings provide insights into the developmental plasticity of the auditory system and frequency representation.

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