Navigation Links
Study links low-frequency hearing to shape of the cochlea
Date:4/25/2008

Shape matters, even in hearing.

Specifically, it is the shape of the cochlea the snail-shell-shaped organ in the inner ear that converts sound waves into nerve impulses that the brain deciphers which proves to be surprisingly important.

A study published online last week in the Proceedings of the National Academy of Sciences establishes a direct link between the cochleas curvature and the low-frequency hearing limit of more than a dozen different mammals.

The relationship will be useful in conservation to estimate the impact that the noises of human activities are having on animals like Siberian tigers, polar bears and marine mammals that wont sit still for hearing tests. It also can provide new information about the hearing of extinct mammals, like mammoths and saber-toothed tigers, and, in so doing, may contribute new insights into how the sense of hearing evolved.

It turns out that it is the curvature of the cochlea, not its size, that is highly correlated to the low-frequency hearing limit, says Daphne Manoussaki, assistant professor of mathematics at Vanderbilt University, who headed the new study with Richard S. Chadwick, a section chief at the National Institute on Deafness and Other Communication Disorders (one of the National Institutes of Health, or NIH).

Spiral-shaped cochleae are exclusive to mammals. Birds and reptiles generally have plate-like or slightly curved versions of this critical organ, limiting the span of octaves that they can hear. Animals with tightly coiled cochleae tend to have greater hearing ranges, but previous attempts to associate these auditory effects with the physical characteristics of the cochlea have proven unsatisfactory because they did not take a critical acoustic effect into account.

In 2006 Manoussaki and her NIH collaborators published a paper proposing that the helical shape of the cochlea enhances low-frequency sounds through an effect analogous to the well-known
'/>"/>

Contact: David F. Salisbury
david.salisbury@vanderbilt.edu
615-343-6803
Vanderbilt University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Childhood obesity indicates greater risk of school absenteeism, Penn study reveals
2. A study by the MUHC and McGill University opens a new door to understanding cancer
3. Study begins to reveal clues to the cause and progression of sepsis
4. Clones on task serve greater good, evolutionary study shows
5. New study warns limited carbon market puts 20 percent of tropical forest at risk
6. New study examines how rearing environment can alter navigation
7. Study links cat disease to flame retardants in furniture and to pet food
8. New continent and species discovered in Atlantic study
9. Study shows link between alcohol consumption and hiv disease progression
10. Feeling hot, hot, hot: New study suggests ways to control fever-induced seizures
11. Study finds environmental tests help predict hospital-acquired Legionnaires disease risk
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/26/2014)... is pumping far more pollution into the atmosphere than ... the National Center for Atmospheric Research estimates that more ... in such fires, emitting gases and particles that can ... new study provides the first rough estimates, on a ... and mercury that are emitted by the fires. Such ...
(Date:8/26/2014)... Previous studies that have suggested an increased risk ... antidepressants during pregnancy may actually reflect the known ... In a study receiving advance online publication in ... Hospital (MGH) report that while a diagnosis ... the children of mothers prescribed antidepressants during pregnancy ...
(Date:8/26/2014)... Treatment of Animals (PETA) and the PETA International Science ... week at the 9th World Congress on Alternatives and ... on alternatives to the use of animals in research, ... problems with current laboratory oversight systems. , At the ... 28, 2014, PETA and PISC will present seven oral ...
Breaking Biology News(10 mins):Trash burning worldwide significantly worsens air pollution 2Trash burning worldwide significantly worsens air pollution 3Study calls into question link between prenatal antidepressant exposure and autism risk 2Study calls into question link between prenatal antidepressant exposure and autism risk 3
... of researchers from the LGC Chemical Metrology Laboratory in the ... up with a method to detect how the proportions of ... of protons and electrons but different numbers of neutrons) vary ... is to be able to use these methods to track ...
... have identified the locking mechanism that allows some neurons ... of genes that produce a critical cell-adhesion molecule involved ... The discovery -- captured with fluorescent imaging of excitatory ... studied in culture as they continued to develop -- ...
... (Nasdaq: AWRE ), a leading supplier of broadband ... first quarter ended March 31, 2009. Revenues for the ... 22% compared to $5.9 million in the same quarter last ... diluted net income per share in accordance with U.S. generally ...
Cached Biology News:Sulphur in just one hair could blow a terrorist's alibi 2Sulphur in just one hair could blow a terrorist's alibi 3Capturing the birth of a synapse 2Aware, Inc. Reports First Quarter 2009 Financial Results 2Aware, Inc. Reports First Quarter 2009 Financial Results 3Aware, Inc. Reports First Quarter 2009 Financial Results 4Aware, Inc. Reports First Quarter 2009 Financial Results 5Aware, Inc. Reports First Quarter 2009 Financial Results 6
(Date:8/26/2014)... 2014 The 20 ambassadors representing the ... community issued the following statement on Facebook today regarding ... driving new funding specifically for ALS research: , “Who ... some ice would raise all this awareness and funding ... and on behalf of the entire ALS community, would ...
(Date:8/26/2014)... 26, 2014  ViveBio, LLC a leading provider ... and transportation, announced today that it has signed ... (LPS) of Knoxville, Tennessee ... the United States . ViveST is ... temperature dried biological specimen transport systems.  The technology ...
(Date:8/26/2014)... Genedata, a leading provider of advanced ... research, today announced the Genedata Screener® Global ... Asia, Europe, and North America during September 2014. ... research organizations will gather for annual User Group ... upcoming challenges in all areas of screening. This ...
(Date:8/26/2014)... Aug. 26, 2014 Albany Molecular Research Inc. ... William S. Marth , President and Chief Executive Officer ... Healthcare Conference on Monday, September 8, 2014 at 8:45 ... of the presentation can be accessed at AMRI,s Investor ... The webcast will be archived for 90 days following ...
Breaking Biology Technology:ALS TDI’s Young Faces of ALS Ambassadors Thank You for Accepting the Ice Bucket Challenge to End ALS 2ALS TDI’s Young Faces of ALS Ambassadors Thank You for Accepting the Ice Bucket Challenge to End ALS 3ALS TDI’s Young Faces of ALS Ambassadors Thank You for Accepting the Ice Bucket Challenge to End ALS 4ViveBio and Laboratory Procurement Services Sign Agreement for Distribution of the ViveST Line of Products 2Thought Leaders to Explore Innovations in SPR & Combination Screening at Genedata Screener User Group Meetings 2Thought Leaders to Explore Innovations in SPR & Combination Screening at Genedata Screener User Group Meetings 3
... Switzerland and NUTLEY, N.J., Oct. 1 This ... leading business and,marketing publications, selected Roche out of ... Year." This marks the first time Roche has,received ... company,s focus on innovation-driven,healthcare as demonstrated by its ...
... 1 - New Product Under Development for ... in 28 European Countries DAIICHI SANKYO EUROPE GmbH ... new antihypertensive medication. It is a fixed combination,(CS-8663) of ... calcium antagonist Amlodipin. When approved, the new combination ...
... 1 Austria now has the most,consumer-friendly healthcare ... Consumer Index (EHCI). The EHCI compares all the ... Switzerland, from a,consumer-friendly point of view, measured by ... the Netherlands, with 2006 winner,France in third place. ...
Cached Biology Technology:Med Ad News Honors Roche as 'Company of the Year' 2Med Ad News Honors Roche as 'Company of the Year' 3DAIICHI SANKYO EUROPE is Applying for Approval of its New Combination Product of Olmesartan and Amlodipin 2European Union has 'Three-Speed' Healthcare System - Many Countries Lagging in Reform 2
... Western blotting is a commonly used ... Typically, protein samples are electrophoresed on SDS-PAGE ... nitrocellulose or nylon, where they are probed ... technologies, which allow reuse of Southern and ...
... ProXPRESS 2D Proteomic Imaging System, Basic Package ... a Wide Dynamic Range: The ProXPRESS 2D ... in imaging system for both proteomic and ... provides unparalleled flexibility, enabling the use of ...
... Introducing our Regulatory Edition of Molecular Imaging ... systems for life science research and drug ... compliance with U.S. Food and Drug Administrations ... 11 Electronic Records; Electronic Signatures [21 CFR ...
... OPA1-01009, OPEP-01009 is a 16 amino acid (amino acids 3-18) ... (DFF). The sequence of this peptide is (amino to ... S - V - K - L - R - ... R - K(18). This peptide may be used ...
Biology Products: