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Developmental changes in chickens' masked thresholds

L Gray1

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Texas Medical School, Houston 77030.

Developmental Psychobiology
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Newly hatched chickens show improved hearing sensitivity within days, likely due to non-sensory factors rather than better frequency resolution. Their masked hearing thresholds resemble those of adult humans.

Area of Science:

  • Auditory Neuroscience
  • Animal Behavior
  • Developmental Biology

Background:

  • Auditory development in neonates is crucial for survival and learning.
  • Understanding early auditory perception in non-human animals can provide insights into human auditory development.
  • Masked hearing thresholds are a key measure of auditory sensitivity in noisy environments.

Purpose of the Study:

  • To investigate the development of auditory sensitivity in young chickens.
  • To compare masked hearing thresholds in neonate chickens with those of mature subjects and human neonates.
  • To explore the factors influencing auditory threshold changes in early life.

Main Methods:

  • Masked hearing thresholds were measured in over 100 chickens at 0 and 4 days of age.

Related Experiment Videos

  • Measurements were taken at four frequencies (0.25, 0.5, 1, and 2 kHz) under three broadband noise levels (0, 10, and 20 dB/Hz).
  • An adaptive procedure utilized delays in ongoing peeps in response to tones presented against background noise.

    • Main Results:

    • Masked thresholds improved by an average of 1 dB per day after birth, indicating increasing auditory sensitivity.
    • This improvement is attributed to nonsensory factors, akin to distraction masking in human neonates.
    • Thresholds were affected by masker spectrum level and frequency similarly to mature subjects.

    Conclusions:

    • Newborn chickens exhibit rapid, likely nonsensory-driven, improvements in auditory sensitivity shortly after hatching.
    • Despite some elevation from nonsensory effects, the masked hearing thresholds of neonate chickens are comparable to those of adult humans.
    • These findings suggest shared mechanisms in early auditory development across species.