Navigation Links
Mystery of elephant infrasounds revealed
Date:8/3/2012

Elephants can communicate using very low frequency sounds, with pitches below the range of human hearing. These low-frequency sounds, termed "infrasounds", can travel several kilometers, and provide elephants with a "private" communication channel that plays an important role in elephants' complex social life. Their frequencies are as low as the lowest notes of a pipe organ.

Although the sounds themselves have been studied for many years, it has remained unclear exactly how elephant infrasounds are made. One possibility, favored by some scientists, is that the elephants tense and relax the muscles in their larynx (or "voice box") for each pulse of sound. This mechanism, similar to cats purring, can produce sounds as low in pitch as desired, but the sounds produced are generally not very powerful.

The other possibility is that elephant infrasounds are produced like human speech or singing, but because the elephant larynx is so large, they are extremely low in frequency. Human humming is produced by vibrations of the vocal folds (also called "vocal cords"), which are set into vibration by a stream of air from the lungs, and don't require periodic muscle activity. By this hypothesis, elephant infrasounds result simply from very long vocal folds slapping together at a low rate, and don't require any periodic tensing of the laryngeal muscles.

To find out, researchers at the University of Vienna, led by voice scientist Christian Herbst and elephant communication expert Angela Stoeger, removed the larynx from an elephant (which died of natural causes), and brought it into the larynx laboratory of the Department of Cognitive Biology (headed by Tecumseh Fitch). By blowing a controlled stream of warm, humid air through the larynx (substituting for the elephants lungs), and manually placing the vocal folds into the "vocal" position, the scientists coaxed the vocal folds into periodic, low-frequency vibrations that match infrasounds in all detail
'/>"/>

Contact: Dr. Christian Herbst
christian.herbst@univie.ac.at
University of Vienna
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Animal reservoir mystery solved
2. New discovery provides insight on long-standing pregnancy mystery
3. Mystery to the origin of long-lived, skin-deep immune cells uncovered
4. UCLA life scientists unlock mystery of how handedness arises
5. Kidney stone mystery solved
6. Study shows how elephants produce their deep voices
7. Elephant seal tracking reveals hidden lives of deep-diving animals
8. The absence of elephants and rhinoceroses reduces biodiversity in tropical forests
9. Detector of DNA damage: Structure of a repair factor revealed
10. Key part of plants rapid response system revealed
11. Ancient giant turtle fossil revealed
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Mystery of elephant infrasounds revealed
(Date:12/22/2014)... 22, 2014  NXT-ID, Inc. (NASDAQ: NXTD and ... on the growing mobile commerce market, announces it has retained ... for the 2015 International CES debut of the Wocket™ biometric ... be at the NXT-ID booth January 6th and 7 th ...
(Date:12/19/2014)... 18, 2014  23andMe, Inc., the leading personal genetics company, today ... in genetic ancestry of individuals from across the ... more than four hundred years ago, the United ... peoples from different continents. This study illuminates how American history ...
(Date:12/17/2014)... , Dec. 16, 2014 Valencell, a leader in ... biometric technology to industry leaders such as Intel, Jabra, ... validated, biometric wearable products. These products will be showcased ... Las Vegas . "Our ...
Breaking Biology News(10 mins):NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 423andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2
... new study led by scientists at the University of ... and the Rosenstiel School of Marine and Atmospheric Science ... stress from catch-and-release fishing. The results revealed that each ... by far the most vulnerable to fighting on a ...
... 30 January, 2014.- A joint study published in ... at the Institute for Research in Biomedicine (IRB Barcelona) ... in Barcelona, and Dolf Weijers at the University of ... the plant hormones called auxins activate multiple vital plant ...
... they have opened the window on the natural process of bone ... be used to advance therapies for bone fractures and disease. ... Feb. 13 issue of the journal Cell Reports , the ... allow adult zebra fish to perfectly replace bones lost upon fin ...
Cached Biology News:New study examines the effects of catch-and-release fishing on sharks 2Scientists unveil a molecular mechanism that controls plant growth and development 2Zebra fish fins help Oregon researchers gain insight into bone regeneration 2
(Date:12/24/2014)... 24, 2014   BioLife Solutions , Inc. (NASDAQ: ... clinical grade hypothermic storage and cryopreservation freeze ... cells and tissues  ("BioLife" or the "Company"), today announced that ... May 4, 2015 (the "Annual Meeting"). Because the ...
(Date:12/24/2014)... 23, 2014 Earlier this year in a ... of the Adult Stem Cell Technology Center, LLC ( ASCTC ... unique property of adult tissue stem cells. His title ... Important for the Future,” embodied the essence of his message ...
(Date:12/24/2014)... Island, New York (PRWEB) December 23, 2014 ... and the Long Island Affiliate of ITRA Global, the national ... slow but steady recovery. This is evidenced by the ... the strong stock market. Low energy costs have held ...
(Date:12/24/2014)... The report expects global cell isolation and expansion ... a carefully analyzed data about the vital drivers, restraints, trends, ... of Report @ http://bit.ly/1yUxy0T , According to the ... growth at an impressive CAGR during near future. It expects ...
Breaking Biology Technology:BioLife Solutions Sets Date for Annual Meeting of Stockholders 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 3Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 4ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3The Cell Expansion Market is Expected to Reach $14.8 billion by 2019 - New Research Report by MarketsandMarkets 2The Cell Expansion Market is Expected to Reach $14.8 billion by 2019 - New Research Report by MarketsandMarkets 3
... by neuroscientist Robin Davis is opening new doors to improved ... lead to a new generation of cochlear implants. , ... different patients. Some may be able to hear sounds like ... can do even better, detecting voice and understanding speech while ...
... nano flakes, may revolutionise the transformation of solar energy ... from solar electricity and save money in the future. ... the expectations, both your economy and the environment will ... of the worlds electricity comes from the sun because ...
... 18 - DuPont today congratulated,growers planting Pioneer(R) brand ... national categories in the 2007 National Sorghum Producers, ... won with Pioneer sorghum,hybrid 84G62., Farmers growing ... national contest segments. First-, second- and third-place national,honors ...
Cached Biology Technology:Rutgers neuroscience may hold key to hearing loss remedy 2DuPont Congratulates Growers Planting Pioneer(R) Brand Sorghum Hybrids in Winning Majority of National Categories in Yield Contest 2