Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Studies Show Human Voice Conveys Stress Level, but Men and Women Respond Differently to Stress

03.11.2011
Lie detectors are used commonly by police departments throughout the United States as a tool to help detect deception based on bodily responses to stress, such as pulse and breathing rate, that are relayed by sensors attached to the suspect,. However, sensitivity is limited and the sensors can be fooled by simple techniques well described on a variety of websites.

But by evaluating the acoustical properties of the human voice, a research team at the University of Florida, Gainesville, is expanding the scientific understanding of the physics of vocal stress – insight that might one day be used to improve the detection of deception.

The research team confirmed that the human voice changes in systematic and perceptible ways under carefully measured, significant stress levels. One early surprise finding is that men and women respond differently to the same stressors. The group will present its work at the 162nd Meeting of the Acoustical Society of America in San Diego on Nov. 2, 2011.

"In male subjects, higher degrees of physiological arousal were under-reported – what you might call a ‘tough guy’ response," explains lead researcher, James Harnsberger, Ph.D., a speech scientist in the Department of Linguistics. The idea to test for gender difference was not part of the original study design. A graduate student on the project, Christian Betzen, suggested analyzing separately the gender categories for the four stress metrics used in the study – two physical and two self-reporting. “The results were a surprise. We had expected that higher stressors would prompt both increased physiological response and increased self-reported stress levels in all test subjects fairly uniformly for both men and women,” Dr. Harnsberger explains. One early conclusion these data suggest is that acoustic analyses should include gender in the study design.

In the study, the Florida team enrolled study subjects from community or religious groups who were considered “committed” – that is, strongly affiliated with a group identity. The study subjects were audio-visually recorded while coached by the researchers to vocalize both truthful and deceptive statements – with the threat from the researchers that the recordings would be shown to fellow community members for judgment. In some conditions, stress was also induced by the administration of electric shock at levels calibrated by the individual volunteer. Other stress responses were measured by pulse rate, skin conductance level (due to sweat), pulse rate, and two self-report scales of perceived discomfort.

Over time, studies such as this hold promise for improving a variety of speech analysis systems in a range of settings – from lie detectors to computerized voice recognition. This is because the acoustic properties of stressed speech overlap with acoustic properties of speech that are dependent on such variables as the speaker’s unique identity, his emotional state, and the words he produces.

The paper 3aSCb44, “Talker and gender effects in induced, simulated, and perceived stress in speech,” will be presented Wednesday morning, Nov. 2.

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.
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

More articles from Studies and Analyses:

nachricht Antarctic Ice Sheet mass loss has increased
14.06.2018 | Technische Universität Dresden

nachricht WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

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

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Better model of water under extreme conditions could aid understanding of Earth's mantle

21.06.2018 | Earth Sciences

What are the effects of coral reef marine protected areas?

21.06.2018 | Life Sciences

The Janus head of the South Asian monsoon

21.06.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>