Nature better than technology at reducing low-level stress

Technology can send a man to the moon, help unlock the secrets of DNA and let people around the world easily communicate through the Internet. But can it substitute for nature?

Apparently not, according to a new study that measured individuals' heart recovery rate from minor stress when exposed to a natural scene through a window, the same scene shown on a high-definition plasma screen, or a blank wall. The heart rate of people who looked at the scene through the window dropped more quickly than the others. In fact, the high-definition plasma screen had no more effect than the blank wall.

In addition, the research done through the Human Interaction with Nature and Technological Systems Lab at the University of Washington showed that when people spent more time looking at the natural scene their heart rates tended to decrease more. That was not the case with the plasma screen.

"Technology is good and it can help our lives, but let's not be fooled into thinking we can live without nature," said Peter Kahn, a UW associate professor of psychology who led the research team.

"We are losing direct experiences with nature. Instead, more and more we're experiencing nature represented technologically through television and other media. Children grow up watching Discovery Channel and Animal Planet. That's probably better than nothing. But as a species we need interaction with actual nature for our physical and psychological well-being."

Part of this loss comes from what the researchers call environmental generational amnesia. This is the idea that across generations the amount of environmental degradation increases, but each generation views conditions it grew up with as largely non-degraded and normal. Children growing up today in the cities with the worst air pollution often, for example, don't believe that their communities are particularly polluted.

"This problem of environmental generational amnesia is particularly important for children coming of age with current technologies," said Rachel Severson, a co-author of the study and a UW psychology doctoral student. "Children may not realize they are not getting the benefits of actual nature when interacting with what we're calling technological nature."

To see how people reacted to nature and a technological representation of it, the researchers recruited 90 college students to participate in an experiment that had them work on four mental tasks while sitting at a desk in an office. With 30 of the students, the desk faced a window overlooking a campus scene that included a large fountain and trees. For a second group of 30 students, the window was replaced with the plasma screen that showed the same nature scene in real time. For the remaining 30 students, curtains covered the plasma screen and the desk faced a blank wall.

Participants were tested individually. Each was welcomed by a researcher, hooked up to a heart rate monitor and told to wait for five minutes while the researcher stepped out of sight. A camera mounted on the wall near the window or plasma screen was synchronized with the heart monitor and tracked participants' eye movements. At the end of the waiting period, the researcher returned, explained the first task and stepped out of sight. This was repeated for the remaining three tasks and then the subject was told to wait again for five minutes.

Heart recovery rate was based on how quickly each participant's heart rate dropped in the 60 seconds after being told to wait or to have one of the tasks explained. Each person's performance was tallied on the basis of six measurements, once after every task and the two waiting periods. Low-level stress was created by having to deal with another person in a social situation and the anticipation or performance anxiety each might have experienced to do well on the four tasks.

The researchers found that participants with the plasma screen actually looked at it just as often as did those who had the window. However, the window held the students' attention significantly longer than the plasma screen did. When participants spent more time looking at the window, their heart rates decreased faster than on tasks when they spent less time looking at the window. This was not true with the plasma screen.

"I was surprised by this," said Kahn. "I thought the plasma screen would come somewhere between the glass window and the blank wall. This study is important because it shows the importance of nature in human lives and at least one limitation of technological nature.

"In the years ahead, technological nature will get more sophisticated and compelling. But if it continues to replace our interaction with actual nature, it will come at a cost. To thrive as a species, we still need to interact with nature by encountering an animal in the wild, walking along the ocean's edge or sleeping under the enormity of the night sky."

The study was funded by the National Science Foundation.

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Peter H. Kahn Jr, Friedman B, Gill B, et al. A plasma display window?-The shifting baseline problem in a technologically mediated natural world. J Environ Psychol. 2008 Jun;28(2):192-199   [Abstract]