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Updated: May 16, 2026

In Ovo Electroporation in the Chicken Auditory Brainstem
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In Ovo Electroporation in the Chicken Auditory Brainstem

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Estradiol selectively enhances auditory function in avian forebrain neurons.

Melissa L Caras1, Matthew O'Brien, Eliot A Brenowitz

  • 1Neurobiology and Behavior Graduate Program, University of Washington, Seattle, Washington 98195, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 11, 2012
PubMed
Summary

Sex steroids like estradiol impact bird hearing. Estradiol enhances auditory responses in specific brain cells, showing a dose-dependent effect on sensory processing in female sparrows.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Animal Behavior

Background:

  • Sex steroids are known to influence sensory processing in vertebrates.
  • The precise effects of hormone levels on forebrain auditory function are not fully understood.

Purpose of the Study:

  • To investigate how circulating sex steroids modulate neuronal responses in the avian auditory system.
  • To test the hypothesis that estradiol levels affect single-unit activity in the telencephalic auditory nucleus, field L.

Main Methods:

  • Manipulated plasma 17β-estradiol levels in female Gambel's white-crowned sparrows to mimic breeding and nonbreeding conditions.
  • Recorded extracellular neuronal responses to auditory stimuli (tones and songs) across various intensities.
  • Analyzed neuronal sensitivity, firing rates, and response ranges in relation to hormone levels.

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Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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Published on: March 18, 2013

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits

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Related Experiment Videos

Last Updated: May 16, 2026

In Ovo Electroporation in the Chicken Auditory Brainstem
10:14

In Ovo Electroporation in the Chicken Auditory Brainstem

Published on: June 9, 2017

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
11:27

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

Published on: March 18, 2013

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
08:24

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits

Published on: July 12, 2022

Main Results:

  • Estradiol selectively enhanced auditory function in neurons with monotonic rate-level functions.
  • Treated cells showed increased spontaneous and evoked firing rates, enhanced tone response strength, and expanded dynamic range for song stimuli.
  • Non-monotonic neurons' sensitivity and dynamic ranges were not significantly altered by estradiol.
  • A strong correlation was observed between individual estradiol concentrations and neuronal response properties in monotonic cells.

Conclusions:

  • Sex steroid hormones, specifically estradiol, differentially regulate distinct neuronal populations within the avian forebrain.
  • These findings demonstrate a dose-dependent hormonal modulation of auditory processing in a specific class of forebrain neurons.
  • The study highlights the intricate relationship between circulating hormone levels and sensory system function.