Related Experiment Video
Updated: Mar 31, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
Published on: May 10, 2019
High-frequency hearing in seals and sea lions
Kane A Cunningham1, Colleen Reichmuth2
1Department of Ocean Sciences, Long Marine Laboratory, University of California, Santa Cruz, 100 Shaffer Road, Santa Cruz, CA 95060, USA.
Pinnipeds like seals can hear high-frequency sounds beyond their known limits. This study reveals their auditory sensitivity patterns and suggests conductive, not cochlear, limitations explain high-frequency hearing fall-off.
Area of Science:
- Marine biology
- Bioacoustics
- Auditory physiology
Background:
- Pinnipeds exhibit underwater sound detection beyond traditional high-frequency hearing limits.
- The auditory mechanisms and sensitivity patterns at these higher frequencies remain poorly understood.
Purpose of the Study:
- To measure auditory sensitivity patterns in pinnipeds at frequencies above their typical hearing range.
- To investigate the auditory mechanism responsible for high-frequency hearing limitations in pinnipeds.
Main Methods:
- Auditory sensitivity was measured for California sea lion, harbor seal, and spotted seal in the 50-180 kHz range.
- A masking experiment using 140 kHz noise was conducted on a harbor seal to assess basilar membrane response.
Main Results:
- All three pinniped subjects displayed two distinct slope regions at the high-frequency end of their audiograms.
- The masking experiment indicated that the rapid decrease in sensitivity is due to conductive mechanism constraints, not cochlear limitations.
Conclusions:
- Pinnipeds possess auditory sensitivity extending to higher frequencies than previously established.
- Hearing limitations at very high frequencies in pinnipeds are likely related to sound conduction rather than the cochlea's frequency resolution.
More Related Videos
06:27Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat
Published on: October 26, 2019
07:13Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
Published on: February 10, 2023
Related Concept Videos
The Cochlea
Echo
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Anatomy of the Ear
Hearing
Hair Cells