Navigation Links
When in danger humans are similar to a deer in the headlights

Standing still when a threat is detected is a defensive, protective reaction. This ancestral and automatic behavior allows the prey to stay unnoticed by a potential predator. A new study published in Psychophysiology finds that humans, like many other complex animals, freeze when encountering a threat. The mere picture of an injured or mutilated human induces this reaction. When viewing these unpleasant images, the study's participants froze as their heart rate decelerated and amount of their body sway reduced. The authors found that this abrupt reaction, so critical for the survival of some animals, has stayed with humans.

Forty-eight male volunteers stood barefoot on a stabilometric platform, to measure balance and body sway, and viewed twenty-four pictures from three different categories. They were: pleasant (sports), neutral (objects), and unpleasant (injured or mutilated humans). Posturographic and electrocardiographic recordings were collected. The author found a significant reduction in body sway along with increased muscle stiffness following the unpleasant/mutilation block of pictures compared to the neutral pictures. The number of heartbeats per minute was also lower after viewing the mutilation pictures than after looking at the others. "This pattern resembles the 'freezing' and 'fear bradycardia' seen in many species when confronted with threatening stimuli, mediated by neural circuits that promote defensive survival," author Eliane Volchan explains.

This study is published in the current issue of Psychophysiology. Media wishing to receive a PDF of the full article please contact journalnews@bos.blackwellpublishing.net

Psychophysiology reports on new theoretical, empirical and methodological advances in: psychology and psychiatry, cognitive science, cognitive and affective neuroscience, social science, health science and behavioral medicine, and biomedical engineering. It is published on behalf of the Society for Psychophysiologica l Research.

The study is authored by Tatiana M. Azevedo, Eliane Volchan, Erika C. Rodrigues, Luiz G. Lutterbach, and Claudia D. Vargas from the Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. And Luiz A. Imbiriba, José M. Oliveira, and Liliam F. Oliveira from the School of Physical Education, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.

Eliane Volchan is an associate professor and work with a team of students and collaborators in the Institute of Biophysics Carlos Chagas Filho at the Federal University of Rio de Janeiro, Brazil. In 2005, Dr. 2005 Volchan was awarded the Comendador da Ordem Nacional do Mérito Científico, by the Presidency of the Republic of Brazil.

Dr. Volchan is available for questions and interviews.


'"/>

Source:Blackwell Publishing Ltd.


Related biology news :

1. Falling ants glide back to trunk to avoid dangers of forest floor
2. Too much water may be as dangerous as too little during long-distance athletic events
3. Leading scientists rank endangered dolphins, porpoises most in need of immediate action
4. Colorful bacteria more dangerous
5. Time and money make a difference in endangered species recovery
6. Costly breeding programs for endangered species pay off
7. Removing egg from nest may help save endangered whooping crane
8. Cattle grazing may help rather than hurt endangered species
9. Envisat radar surveillance protects endangered prehistoric fish
10. The dangerous legacy of lead
11. Overfishing may drive endangered seabird to rely upon lower quality food
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/3/2017)... 2017  Data captured by IsoCode, IsoPlexis ... a statistically significant association between the potency ... and objective response of cancer patients post-treatment. ... whether cancer patients will respond to CAR-T ... as to improve both pre-infusion potency testing and ...
(Date:3/28/2017)... March 28, 2017 The report ... (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, VMS), ... - Global Forecast to 2022", published by MarketsandMarkets, the ... and is projected to reach USD 75.64 Billion by ... 2022. The base year considered for the study is ...
(Date:3/23/2017)... , Mar. 23, 2017 Research and Markets ... Market Analysis & Trends - Industry Forecast to 2025" report ... ... at a CAGR of around 8.8% over the next decade to ... report analyzes the market estimates and forecasts for all the given ...
Breaking Biology News(10 mins):
(Date:6/28/2017)... June 28, 2017 Michael Zasloff , ... University School of Medicine, and Founder, Chairman and CEO ... study that has helped clarify the function of alpha-Synuclein ... other neurodegenerative diseases. Denise Barbut , MD, FRCP, ... was senior co-author of the study. Published ...
(Date:6/28/2017)... ... June 28, 2017 , ... ... three research projects accepted for presentation at the 33rd Annual Meeting of the ... – including some of the world’s top thought leaders in reproductive medicine – ...
(Date:6/28/2017)... and London, June 28, 2017 (PRWEB) , ... ... ... The latest release of Siemens’ STAR-CCM+® software for multiphysics computational fluid ... enable automated product design exploration and optimization. STAR-CCM+ version 12.04 introduces Design ...
(Date:6/28/2017)... NC (PRWEB) , ... June 28, 2017 , ... Studies ... might lead to an effective treatment for Parkinson’s disease. But what has not been ... should take place to gain the best results. , A new study coming out ...
Breaking Biology Technology: