Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Phobia's effect on perception of feared object allows fear to persist

23.02.2012
The more afraid a person is of a spider, the bigger that individual perceives the spider to be, new research suggests.

In the context of a fear of spiders, this warped perception doesn't necessarily interfere with daily living. But for individuals who are afraid of needles, for example, the conviction that needles are larger than they really are could lead people who fear injections to avoid getting the health care they need.

A better understanding of how a phobia affects the perception of feared objects can help clinicians design more effective treatments for people who seek to overcome their fears, according to the researchers.

In this study, participants who feared spiders were asked to undergo five encounters with live spiders – tarantulas, in fact – and then provide size estimates of the spiders after those encounters ended. The more afraid the participants said they were of the spiders, the larger they estimated the spiders had been.

"If one is afraid of spiders, and by virtue of being afraid of spiders one tends to perceive spiders as bigger than they really are, that may feed the fear, foster that fear, and make it difficult to overcome," said Michael Vasey, professor of psychology at Ohio State University and lead author of the study.

"When it comes to phobias, it's all about avoidance as a primary means of keeping oneself safe. As long as you avoid, you can't discover that you're wrong. And you're stuck. So to the extent that perceiving spiders as bigger than they really are fosters fear and avoidance, it then potentially is part of this cycle that feeds the phobia that leads to its persistence.

"We're trying to understand why phobias persist so we can better target treatments to change those reasons they persist."

The study is published in a recent issue of the Journal of Anxiety Disorders.

The researchers recruited 57 people who self-identified as having a spider phobia. Each participant then interacted at specific time points over a period of eight weeks with five different varieties of tarantulas varying in size from about 1 to 6 inches long.

The spiders were contained in an uncovered glass tank. Participants began their encounters 12 feet from the tank and were asked to approach the spider. Once they were standing next to the tank, they were asked to guide the spider around the tank by touching it with an 8-inch probe, and later with a shorter probe.

Throughout these encounters, researchers asked participants to report how afraid they were feeling on a scale of 0-100 according to an index of subjective units of distress. After the encounters, participants completed additional self-report measures of their specific fear of spiders, any panic symptoms they experienced during the encounters with the spiders, and thoughts about fear reduction and future spider encounters.

Finally, the research participants estimated the size of the spiders – while no longer being able to see them – by drawing a single line on an index card indicating the length of the spider from the tips of its front legs to the tips of its back legs.

An analysis of the results showed that higher average peak ratings of distress during the spider encounters were associated with estimates that the spiders were larger than they really were. Similar positive associations were seen between over-estimates of spider size and participants' higher average peak levels of anxiety, higher average numbers of panic symptoms and overall spider fear. These findings have been supported in later studies with broader samples of people with varying levels of fear of spiders.

"It would appear from that result that fear is driving or altering the perception of the feared object, in this case a spider," said Vasey, also the director of research for the psychology department's Anxiety and Stress Disorders Clinic. "We already knew fear and anxiety alter thoughts about the feared thing. For example, the feared outcome is interpreted as being more likely than it really is. But this study shows that even perception is altered by fear. In this case, the feared spider is seen as being bigger. And that may serve as a maintaining factor for the fear."

The approach tasks with the spiders are a classic example of exposure therapy, a common treatment for people with phobias. Though this therapy is known to be effective, scientists still do not fully understand why it works. And for some, the effects don't last – but it is difficult to predict who will have a relapse of fear, Vasey said.

He and colleagues are studying these biased perceptions as well as attitudes with hopes that the new knowledge will enhance treatment for people with various phobias. The work suggests that fear not only alters one's perception of the feared thing, but also can influence a person's automatic attitude toward an object. Those who have developed an automatic negative attitude toward a feared object might have a harder time overcoming their fear.

Though individuals with arachnophobia are unlikely to seek treatment, the use of spiders in this research was a convenient way to study the complex effects of fear on visual perception and how those effects might cause fear to persist, Vasey noted.

"Ultimately, we are interested in identifying predictors of relapse so we can better measure when a person is done with treatment," he said.

This work is supported by the National Institute of Mental Health.

Co-authors include Michael Vilensky, Jacqueline Heath, Casaundra Harbaugh, Adam Buffington and Vasey's principal collaborator, Russell Fazio, all of Ohio State's Department of Psychology.

Michael Vasey | EurekAlert!
Further information:
http://www.osu.edu

More articles from Health and Medicine:

nachricht Real-time imaging of lung lesions during surgery helps localize tumors and improve precision
30.07.2015 | American Association for Thoracic Surgery

nachricht Experimental MERS vaccine shows promise in animal studies
29.07.2015 | NIH/National Institute of Allergy and Infectious Diseases

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

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

Im Focus: Quantum Matter Stuck in Unrest

Using ultracold atoms trapped in light crystals, scientists from the MPQ, LMU, and the Weizmann Institute observe a novel state of matter that never thermalizes.

What happens if one mixes cold and hot water? After some initial dynamics, one is left with lukewarm water—the system has thermalized to a new thermal...

Im Focus: On the crest of the wave: Electronics on a time scale shorter than a cycle of light

Physicists from Regensburg and Marburg, Germany have succeeded in taking a slow-motion movie of speeding electrons in a solid driven by a strong light wave. In the process, they have unraveled a novel quantum phenomenon, which will be reported in the forthcoming edition of Nature.

The advent of ever faster electronics featuring clock rates up to the multiple-gigahertz range has revolutionized our day-to-day life. Researchers and...

Im Focus: Superfast fluorescence sets new speed record

Plasmonic device has speed and efficiency to serve optical computers

Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.

Im Focus: Unlocking the rice immune system

Joint BioEnergy Institute study identifies bacterial protein that is key to protecting rice against bacterial blight

A bacterial signal that when recognized by rice plants enables the plants to resist a devastating blight disease has been identified by a multi-national team...

Im Focus: Smarter window materials can control light and energy

Researchers in the Cockrell School of Engineering at The University of Texas at Austin are one step closer to delivering smart windows with a new level of energy efficiency, engineering materials that allow windows to reveal light without transferring heat and, conversely, to block light while allowing heat transmission, as described in two new research papers.

By allowing indoor occupants to more precisely control the energy and sunlight passing through a window, the new materials could significantly reduce costs for...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

3rd Euro Bio-inspired - International Conference and Exhibition on Bio-inspired Materials

23.07.2015 | Event News

Clash of Realities – International Conference on the Art, Technology and Theory of Digital Games

10.07.2015 | Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

 
Latest News

Tool making and additive technology exhibition: Fraunhofer IPT at Formnext

31.07.2015 | Trade Fair News

First Siemens-built Thameslink train arrives in London

31.07.2015 | Transportation and Logistics

California 'rain debt' equal to average full year of precipitation

31.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>