Navigation Links
Lost Hikers, Backpackers Really Do Walk in Circles
Date:8/20/2009

Study shows disorientation occurs quickly without the sun, moon for guidance,,

THURSDAY, Aug. 20 (HealthDay News) -- Stories abound of adventurers losing their way in the wilderness, unwittingly walking in circles for days.

Now, new research confirms that the anecdotes are true. Without the sun, a compass or a landmark, people trying to follow a straight course through a forest or a desert ended up back where they started, according to a study published online Aug. 20 in Current Biology.

"Our results confirm the stories that are often described in films and books: people often walk in circles when they are lost," said study author Jan Souman, of the Max Planck Institute for Biological Cybernetics in Germany. "Second, our results show that even something seemingly very simple as walking in a straight line actually involves a complicated interplay between several senses, our motor actions and cognition."

In the first experiment, researchers instructed six participants to walk as straight as they could through a large, flat forest, a place in which one tree could quickly look very much like another.

Four participants, walking on a day in which the sun was hidden behind a thick cloud cover, all went in circles, with three participants unintentionally crossing their own path several times.

Two participants walked through the forest on a sunny day. With the sun to guide them, they followed an almost perfectly straight course, as measured by a global positioning system (GPS), except during the first 15 minutes, when the sun was still hidden behind the clouds.

Next, researchers had three people walk in the Sahara desert. Two participants who walked when the sun was out veered from a straight line, but did not walk in a circle.

A third participant walked at night. As soon as the moon disappeared behind clouds, the walker made several sharp turns and started heading back in the direction from which he came.

In a third experiment, researchers had participants attempt to walk a straight line through a grassy field while blindfolded for 50 minutes. Not only did they walk in circles, some of the circles were as small as about 66 feet, similar in size to a basketball court.

"People cannot walk in a straight line if they do not have absolute references, such as a tower or a mountain in the distance or the sun or moon, and often end up walking in circles," Souman said.

Theories about circle-walking include the concept that each person has a bias to turn in one direction because of subtle differences in the strength or length of one leg over the other.

But in the study, participants drifted left or right, and often reversed course, without seeming to favor either direction.

So why do people travel in circles without visual guideposts?

Walking in a straight line is actually a complex task involving the brain, sense of sight, proprioception (the sense of where parts of the body are located relative to each other in space), and the vestibular system, which is involved with spatial awareness and sense of balance, Souman said.

When those are disrupted, people tend to drift randomly, often passing through the place where they started, the study authors noted.

"Our results show that even when people feel they are very certain that they are walking in the correct direction, they still can be very wrong," Souman said. "We cannot always trust our senses."

Paul Sanberg, director of the University of South Florida Center for Aging and Brain Repair, said the study has important implications for pilots and sailors.

"The significance of the experiment is that it shows how important senses are for navigating," Sanberg said. "It's showing scientifically what we had known anecdotally."

When flying into clouds, pilots who think they're flying straight can get into trouble quickly if they don't rely on navigational instruments, said Sanberg, a flight instructor.

"Gravity and your inner ear may not be telling you the right information," Sanberg said.

When in the wilderness, bring a compass or GPS. "It's important to realize how difficult it is to follow a certain course in a terrain that you don't know," Souman said.

More information

The American Red Cross has hiking safety tips.



SOURCES: Jan Souman, Max Planck Institute for Biological Cybernetics, Tubingen, Germany; Paul Sanberg, Ph.D., D.Sc., professor, neurosurgery, and director, University of South Florida Center for Aging and Brain Repair, Tampa, Fla.; Aug. 20, 2009, Current Biology, online


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Really Think Different
2. Does the Crowded TNF Market Really Need Two New Agents? Rheumatologists Provide Insight in the Wave One Report of LaunchTrends(TM): SIMPONI and CIMZIA
3. Go to the doctor? Only if Im really sick ...
4. Go to the doctor? Only if Im really sick...
5. Younger Teens Really Do Care What People Think
6. Multiple Sclerosis - What Are People With MS and Their Health Care Providers Really Thinking?
7. What does Mom really want for Mothers Day?
8. Do Fad Diets Really Work?
9. Heavenly Essence Introduces Pureity - the Only Line of Hair Care Products That Really Cares About You
10. No April Fooling: Higher Taxes On Tobacco Really Do Reduce Smoking, Says American Lung Association of Upper Midwest
11. Is it Really About Alcohol? The Truth About Alcohol Abuse in Women
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Lost Hikers, Backpackers Really Do Walk in Circles
(Date:6/27/2016)... , ... June 27, 2016 , ... "FCPX editors can ... inside of Final Cut Pro X," said Christina Austin - CEO of Pixel Film ... Final Cut Pro X users can now reveal the media of their ...
(Date:6/27/2016)... ... June 27, 2016 , ... TopConsumerReviews.com recently awarded their highest five-star rating to ... of individuals in the United States and Canada wear eyeglasses. Once considered to be ... vision and make a fashion statement. Even celebrities use glasses as a way of ...
(Date:6/26/2016)... ... June 26, 2016 , ... PawPaws brand pet supplements ... that was developed to enhance the health of felines. The formula is all-natural and ... main herbs in the PawPaws Cat Kidney Support Supplement Soft Chews are ...
(Date:6/25/2016)... ... ... Austin residents seeking Mohs surgery services, can now turn to Dr. Jessica ... Peckham for medical and surgical dermatology. , Dr. Dorsey brings specialization to include Mohs ... Mohs Micrographic Surgery completed by Dr. Dorsey was under the direction of Glenn Goldstein, ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, Dr. Omkar ... M.D from the David Geffen School of Medicine at UCLA. He trained in Internal ... complete his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where he had ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... June 24, 2016  Consumers have taken a ... have placed more emphasis on patient outcomes. ... programs in the pharmaceutical industry have evolved beyond ... pharmaceutical companies are focusing on becoming more patient-oriented ... products and services that improve health. ...
(Date:6/24/2016)... 2016 Dublin ... addition of the " Global Markets for Spectroscopy ... This report focuses on the ... review, including its applications in various applications. The report ... includes three main industries: pharmaceutical and biotechnology, food and ...
(Date:6/24/2016)... SAN CLEMENTE, Calif. , June 24, 2016  American Respiratory ... testing company, is now able to perform sophisticated lung assessments in ... Medical Technologies , Inc. Patients are no longer ... to ndd,s EasyOne PRO ® , ARL patients like Jeanne R. ... testing done in the comfort of her own home. ...
Breaking Medicine Technology: