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Updated: Nov 30, 2025
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Auditory Brainstem Response and Outer Hair Cell Whole-cell Patch Clamp Recording in Postnatal Rats
Published on: May 24, 2018
9.8K
Development of hearing in the big brown bat
Doreen Möckel1, Thomas Groulx1, Paul A Faure2
1Department of Psychology, Neuroscience & Behaviour, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada.
Summary
Big brown bat pups develop hearing sensitivity rapidly after birth. Their ability to detect high ultrasonic frequencies improves significantly as they mature and prepare for flight and echolocation.
Area of Science:
- Zoology
- Bioacoustics
- Developmental Biology
Background:
- The development of auditory systems is crucial for survival in many species.
- Bats, particularly Eptesicus fuscus, rely heavily on auditory cues for navigation and foraging through echolocation.
Purpose of the Study:
- To investigate the developmental trajectory of hearing sensitivity in young Eptesicus fuscus.
- To correlate auditory development with key life stages such as outer ear canal opening and the onset of flight.
Main Methods:
- Auditory Brainstem Response (ABR) recordings were used to assess hearing thresholds.
- Measurements were taken across a wide frequency range (4-100 kHz) in pups from postnatal day 10 to 1 year of age.
Main Results:
- Outer auditory canals typically opened by postnatal day 7, with some extending to day 11.
- Significant improvements in auditory sensitivity were observed between postnatal day 10 and 19.
- Sensitivity to high ultrasonic frequencies (>48 kHz) increased markedly as pups approached volant stages.
Conclusions:
- Hearing sensitivity in Eptesicus fuscus develops progressively, with rapid maturation in early postnatal life.
- The enhancement of high-frequency hearing coincides with the developmental period of learning to fly and echolocate, suggesting functional adaptation.
Keywords:
AudiogramAuditory brainstem responseEptesicus fuscusExternal ear canalPup auditory maturationMore Related Videos
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