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Mice sing like a jet-engine

Date:
October 10, 2016
Source:
University of Cambridge
Summary:
Mice court one another with ultrasonic love songs that are inaudible to the human ear. New research shows they make these unique high frequency sounds using a mechanism that has only previously been observed in supersonic jet engines.
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Mice, rats and many other rodents produce ultrasonic songs that they use for attracting mates and territorial defense.
Credit: © jonnysek / Fotolia

Mice court one another with ultrasonic love songs that are inaudible to the human ear. New research shows they make these unique high frequency sounds using a mechanism that has only previously been observed in supersonic jet engines.

Mice, rats and many other rodents produce ultrasonic songs that they use for attracting mates and territorial defense. These 'singing' mice are often used to study communication disorders in humans, such as stuttering. However, until now it was not understood how mice can make these ultrasonic sounds, which may aid in the development of more effective animal models for studying human speech disorders.

Now, new research co-authored at the University of Cambridge and published in the journal Current Biology has found that when mice 'sing', they use a mechanism similar to that seen in the engines of supersonic jets.

"Mice make ultrasound in a way never found before in any animal," said the study's lead author Elena Mahrt, from Washington State University.

Previously, it had been thought that these 'Clangers'-style songs were either the result of a mechanism similar to that of a tea kettle, or of the resonance caused by the vibration of the vocal cords. In fact, neither hypothesis turned out to be correct. Instead, mice point a small air jet coming from the windpipe against the inner wall of the larynx, causing a resonance and producing an ultrasonic whistle.

Using ultra-high-speed video of 100,000 frames per second the researchers showed that the vocal folds remain completely still while ultrasound was coming from the mouse's larynx.

"This mechanism is known only to produce sound in supersonic flow applications, such as vertical takeoff and landing with jet engines, or high-speed subsonic flows, such as jets for rapid cooling of electrical components and turbines," said Dr Anurag Agarwal, study co-author and head of the Aero-acoustics laboratories at Cambridge's Department of Engineering. "Mice seem to be doing something very complicated and clever to make ultrasound."

"It seems likely that many rodents use ultrasound to communicate, but very little is known about this -- it is even possible that bats use this cool mechanism to echolocate," said the study's senior author Dr Coen Elemans from the University of Southern Denmark. "Even though mice have been studied so intensely, they still have some cool tricks up their sleeves."


Story Source:

Materials provided by University of Cambridge. The original story is licensed under a Creative Commons Licence. Note: Content may be edited for style and length.


Journal Reference:

  1. Elena Mahrt, Anurag Agarwal, David Perkel, Christine Portfors, Coen P.H. Elemans. Mice produce ultrasonic vocalizations by intra-laryngeal planar impinging jets. Current Biology, 2016; 26 (19): R880 DOI: 10.1016/j.cub.2016.08.032

Cite This Page:

University of Cambridge. "Mice sing like a jet-engine." ScienceDaily. ScienceDaily, 10 October 2016. <www.sciencedaily.com/releases/2016/10/161010133641.htm>.
University of Cambridge. (2016, October 10). Mice sing like a jet-engine. ScienceDaily. Retrieved May 22, 2017 from www.sciencedaily.com/releases/2016/10/161010133641.htm
University of Cambridge. "Mice sing like a jet-engine." ScienceDaily. www.sciencedaily.com/releases/2016/10/161010133641.htm (accessed May 22, 2017).

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