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Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis
Published on: January 4, 2017
Barn owls have ageless ears.
Bianca Krumm1, Georg Klump1, Christine Köppl1
1Cluster of Excellence 'Hearing4all', Animal Physiology and Behaviour Group, Department of Neuroscience, School of Medicine and Health Sciences, University of Oldenburg, 26111 Oldenburg, Germany.
Proceedings. Biological Sciences
|September 22, 2017
Summary
Barn owls exhibit exceptional auditory sensitivity, with hearing thresholds below 0 dB sound pressure level (SPL) across a wide frequency range. Age did not significantly impact their hearing, suggesting natural protection against age-related hearing loss.
Area of Science:
- Auditory Neuroscience
- Animal Bioacoustics
- Comparative Physiology
Background:
- The auditory sensitivity of barn owls (Tyto alba) is crucial for their predatory success.
- Understanding age-related hearing changes (presbycusis) in birds is important, given their hair cell regeneration capabilities.
Purpose of the Study:
- To measure the auditory sensitivity across different frequencies in barn owls.
- To investigate the effect of age on auditory thresholds in barn owls.
- To compare the hearing capabilities of barn owls with other species.
Main Methods:
- A behavioral Go/NoGo paradigm was used to assess auditory thresholds.
- Two age groups were tested: younger than 2 years and older than 13 years.
- Audiograms were generated for frequencies ranging from 0.5 to 12 kHz.
Main Results:
- Average thresholds in quiet were below 0 dB SPL between 1 and 10 kHz.
- The lowest mean threshold was -12.6 dB SPL at 8 kHz.
- Auditory thresholds were significantly affected by test frequency, but not by age group.
Conclusions:
- Barn owls possess acute hearing, particularly in the mid-to-high frequency range.
- The lack of significant age-related decline suggests birds may be protected from presbycusis due to hair cell regeneration.
- Further research into avian auditory systems can inform human hearing loss treatments.
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