Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

Ear Anatomy May Amplify Irritating Tones of Chalkboard Squeak

04.11.2011
The sound of fingernails on a chalkboard sets many people’s teeth on edge, and now a team of researchers from the University of Cologne in Germany and the University of Vienna in Austria think they know why.

In a study designed to pinpoint the source of this and similarly irritating sounds, scientists found that the most obnoxious elements of the noises may be amplified by the shape of the human ear. The team will present its results at the 162nd meeting of the Acoustical Society of America (ASA), which runs from Oct. 31 – Nov. 4 in San Diego, Calif.

In the study, scientists removed information from actual audio clips of people scraping their nails or bits of chalk against a chalkboard. They then played these modified clips to willing participants. Half the study subjects were told what the sounds were; the other half thought that they were listening to selections from contemporary music. Scientists asked the participants to rate each sound’s unpleasantness, and also gauged the subjects’ stress responses to the noises by measuring their blood pressure, heart rate, and skin conductivity (a measure of sweating).

The human ear is known to be particularly sensitive to pitches in the mid- to low-level range of frequencies, between 2000 hertz and 4000 hertz, which is the peak of human hearing. It turns out that when scientists removed all the pitch information in this range from the audio recordings, the study participants rated the noises as more pleasant than other versions of the sounds. One explanation for people’s sensitivity to this band of frequencies is that sounds in this range are amplified due to the anatomy of the ear canal; they are literally louder to us than other sounds are. So chalkboard squeak may be irksome because the most obnoxious elements of the sound sit right in the sweet spot of human hearing.

... more about:
»Acoustical Society »Amplify »Chalkboard »EAR »Squeak

“We supposed that frequencies in the low-mid range [of human hearing] would play a major role” in the unpleasantness of the sounds, said Michael Oehler, professor of media and music management at the University of Cologne in Germany, who will present his team’s findings at the conference. “But we did not know the exact range. Furthermore, the influence of pitch information was greater than we thought.”

Of potential interest to psychologists is the finding that participants who knew that the sounds they were hearing came from nails on a chalkboard rated these sounds more unpleasant, and experienced a higher degree of sweating, than the people who thought they were listening to music.

The presentation, “Psychoacoustics of chalkboard squeaking,” by Christoph Reuter and Michael Oehler will be at 3:15 p.m. on Thursday, Nov. 3 at the Town and Country Hotel and Convention Center in San Diego, Calif.

USEFUL LINKS:
Main meeting website: http://acousticalsociety.org/
Searchable index: http://asa.aip.org/asasearch.html
Hotel site: http://www.towncountry.com/index.cfm
Webcast registration and viewing: http://www.aipwebcasting.com
WORLD WIDE PRESS ROOM
In the week before the meeting, the ASA's World Wide Press Room (www.acoustics.org/press) will be updated with lay-language papers, which are 300-1200 word summaries of presentations written by scientists for a general audience and accompanied by photos, audio, and video.
PRESS REGISTRATION
The Acoustical Society will grant free registration to credentialed full-time journalists and professional freelance journalists working on assignment for major news outlets. If you are a reporter and would like to attend, contact Charles E. Blue (cblue@aip.org, 301-209-3091), who can also help with setting up interviews and obtaining images, sound clips, or background information.
ABOUT THE ACOUSTICAL SOCIETY OF AMERICA
The Acoustical Society of America (ASA) is the premier international scientific society in acoustics devoted to the science and technology of sound. Its 7,000 members worldwide represent a broad spectrum of the study of acoustics. ASA publications include The Journal of the Acoustical Society of America (the world's leading journal on acoustics), Acoustics Today magazine, books, and standards on acoustics. The society also holds two major scientific meetings each year. For more information about ASA, visit our website at http://www.acousticalsociety.org

Charles E. Blue | Newswise Science News
Further information:
http://www.aip.org
http://www.acousticalsociety.org

Further reports about: Acoustical Society Amplify Chalkboard EAR Squeak

More articles from Physics and Astronomy:

nachricht Belle II yields the first results: In search of the Z′ boson
07.04.2020 | Max-Planck-Institut für Physik

nachricht Scientists see energy gap modulations in a cuprate superconductor
02.04.2020 | DOE/Brookhaven National Laboratory

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Belle II liefert erste Ergebnisse: Auf der Suche nach dem Z‘-Boson

Vor ziemlich genau einem Jahr ist das Belle II-Experiment angelaufen. Jetzt veröffentlicht das renommierte Journal Physical Review Letters die ersten Resultate des Detektors. Die Arbeit befasst sich mit einem neuen Teilchen im Zusammenhang mit der Dunklen Materie, die nach heutigem Kenntnisstand etwa 25 Prozent des Universums ausmacht.

Seit etwa einem Jahr nimmt das Belle II-Experiment Daten für physikalische Messungen. Sowohl der Elektron-Positron-Beschleuniger SuperKEKB als auch der...

Im Focus: Belle II yields the first results: In search of the Z′ boson

The Belle II experiment has been collecting data from physical measurements for about one year. After several years of rebuilding work, both the SuperKEKB electron–positron accelerator and the Belle II detector have been improved compared with their predecessors in order to achieve a 40-fold higher data rate.

Scientists at 12 institutes in Germany are involved in constructing and operating the detector, developing evaluation algorithms, and analyzing the data.

Im Focus: Wenn Ionen an ihrem Käfig rütteln

In vielen Bereichen spielen „Elektrolyte“ eine wichtige Rolle: Sie sind bei der Speicherung von Energie in unserem Körper wie auch in Batterien von großer Bedeutung. Um Energie freizusetzen, müssen sich Ionen – geladene Atome – in einer Flüssigkeit, wie bspw. Wasser, bewegen. Bisher war jedoch der präzise Mechanismus, wie genau sie sich durch die Atome und Moleküle der Elektrolyt-Flüssigkeit bewegen, weitgehend unverstanden. Wissenschaftler*innen des Max-Planck-Instituts für Polymerforschung haben nun gezeigt, dass der durch die Bewegung von Ionen bestimmte elektrische Widerstand einer Elektrolyt-Flüssigkeit sich auf mikroskopische Schwingungen dieser gelösten Ionen zurückführen lässt.

Kochsalz wird in der Chemie auch als Natriumchlorid bezeichnet. Löst man Kochsalz in Wasser lösen sich Natrium und Chlorid als positiv bzw. negativ geladene...

Im Focus: When ions rattle their cage

Electrolytes play a key role in many areas: They are crucial for the storage of energy in our body as well as in batteries. In order to release energy, ions - charged atoms - must move in a liquid such as water. Until now the precise mechanism by which they move through the atoms and molecules of the electrolyte has, however, remained largely unknown. Scientists at the Max Planck Institute for Polymer Research have now shown that the electrical resistance of an electrolyte, which is determined by the motion of ions, can be traced back to microscopic vibrations of these dissolved ions.

In chemistry, common table salt is also known as sodium chloride. If this salt is dissolved in water, sodium and chloride atoms dissolve as positively or...

Im Focus: Den Regen für Hydrovoltaik nutzen

Wassertropfen, die auf Oberflächen fallen oder über sie gleiten, können Spuren elektrischer Ladung hinterlassen, so dass sich die Tropfen selbst aufladen. Wissenschaftlerinnen und Wissenschaftler des Max-Planck-Instituts für Polymerforschung (MPI-P) in Mainz haben dieses Phänomen, das uns auch in unserem Alltag begleitet, nun detailliert untersucht. Sie entwickelten eine Methode zur Quantifizierung der Ladungserzeugung und entwickelten zusätzlich ein theoretisches Modell zum besseren Verständnis. Nach Ansicht der Wissenschaftler könnte der beobachtete Effekt eine Möglichkeit zur Energieerzeugung und ein wichtiger Baustein zum Verständnis der Reibungselektrizität sein.

Wassertropfen, die über nicht leitende Oberflächen gleiten, sind überall in unserem Leben zu finden: Vom Tropfen einer Kaffeemaschine über eine Dusche bis hin...

Alle Focus-News des Innovations-reports >>>

Anzeige

Anzeige

VideoLinks
Industrie & Wirtschaft
Veranstaltungen

Aachener Werkzeugmaschinen-Kolloquium AWK’21 findet am 10. und 11. Juni 2021 statt

06.04.2020 | Veranstaltungen

Interdisziplinärer Austausch zum Design elektrochemischer Reaktoren

03.04.2020 | Veranstaltungen

13. »AKL – International Laser Technology Congress«: 4.–6. Mai 2022 in Aachen – Lasertechnik Live bereits früher!

02.04.2020 | Veranstaltungen

VideoLinks
Wissenschaft & Forschung
Weitere VideoLinks im Überblick >>>
 
Aktuelle Beiträge

Belle II liefert erste Ergebnisse: Auf der Suche nach dem Z‘-Boson

07.04.2020 | Physik Astronomie

Festkörperphysik: Vorhersage der Quantenphysik experimentell nachgewiesen

07.04.2020 | Physik Astronomie

Wie Serotonin die Kommunikation im Gehirn ausbalanciert

07.04.2020 | Biowissenschaften Chemie

Weitere B2B-VideoLinks
IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics