Benefits of Nature: Notes from One Study

This is another blog entry that is “off the beaten path,” but I’m looking at some of the studies on benefits of time spent in nature (as well as mindfulness), and you are welcome to come along for the ride.

Mayer, F.S., Frantz, C.M., Bruehlman-Senecal, E., & K. Dolliver. 2009. Why is Nature Beneficial? The Role of Connectedness to Nature

This paper contained three studies looking at the effects of exposure to real or virtual nature. They used questionnaire-type data to measure positive emotions and ability to reflect on a real-life problem.

The authors noted that years of research have established that time spent in nature “decreases negative behaviors and states” and “increases positive ones.” They also noted that we aren’t so sure if pictures and videos of nature are as effective as the real thing, or how exposure to nature works to produce benefits. Among the possibilities that have been considered are: nature helps us recover from stress and attention fatigue, it encourages exercise, it may facilitate social contact, it may encourage optimal development in children and/or perhaps it provides “opportunities for personal development and a sense of purpose.” They wondered if increases in connectedness to nature might be a mechanism through which time in nature yields benefits.

To measure this sense of connection to nature, the first two authors developed a self-report scale, the “Connectedness to Nature Scale” (CNS). With it, participants rate (on a seven-point scale from “strongly disagree” to “strongly agree”) their agreement with statements about feeling kinship with animals and plants or a sense of belonging with the natural world. The authors reported that earlier studies have shown that the CNS measures a real “thing” and does its job effectively.

The authors also wanted to see whether exposure to nature can lead to increases in the ability to reflect on a problem and feel more prepared to address that problem.

Study 1

Seventy-six students participated. One group was taken to an urban downtown area and the other went to a nature preserve. While on the way, they were asked to reflect on a personal issue that needed resolving. After taking a walk in the assigned setting (downtown or preserve), they were asked to spread out from each other and independently complete some measures of attention, positive/negative emotion, connectedness to nature (the CNS), self-awareness, and a rating of how they perceived their ability to resolve that personal issue noted above.

Those in the nature condition reported positive emotions to a significantly higher degree than those in the urban condition. They also rated their ability to reflect on their personal issue as much greater. Spending time in nature also had higher scores for connectedness to nature. Further, those in the nature condition made fewer errors on the measure of ability to pay attention.

Study 2

In this study, the investigators looked at whether real nature provides more benefits than virtual nature. Ninety-two undergraduate students participated. They met on campus and one group walked to an arboretum while the other walked to the psychology building where they were further divided into a group that watched a ten minute video of a walk at the arboretum and the other watched a video of a busy metropolitan street.

Those who walked in the arboretum had significantly more positive emotion either the virtual nature or virtual urban conditions. Participants’ ability to reflect on a problem issue was greater after either the real or virtual nature exposure and worse after the urban exposure. The measures of connectedness to nature were higher for both nature groups and lower for the urban video group.

Study 3

This study was done to further examine the effect of real and virtual nature on participants’ ability to reflect on a personal issue that needed solving. Sixty-four students participated, meeting at an on-campus building. One group walked to the arboretum and the other group walked to the psychology building. Once arriving, the nature group walked for 10 minutes in the arboretum and the virtual nature group watched a 10 minute video of a similar walk in the same arboretum.

Again, those who took the real walk in nature reported more positive emotion. This time, with greater statistical power because there were only two groups to compare, the “real” nature group were significantly more able to reflect on an issue needing to be resolved.

A Final Note

The authors looked at the relationships among the variables, and for each study concluded that a person’s sense of connectedness to nature generally predicted the positive emotions, ability to reflect, and other positive results. Their conclusion was that exposure to nature increases the sense of connectedness to nature, and that is what brings some of the other benefits of time spent in nature.

Doing research to investigate these issues is challenging. To compare the reactions of different people, you must design experiences that do not have unintentional differences that could bias the results. The way you measure things must be the same across different people, or else you could get results that are skewed because of different ways that you measured your results. These challenges tend to result in studies that use paper-and-pencil measures and brief or limited exposure to nature.

Many of us might think “connectedness with nature” is hard to capture in a 13 or 14 item rating scale. We might note that our ability to reflect on problems might not fully be captured by having people rate how much they think they have that capacity. Additionally, positive or negative emotions were measured by having participants rate the degree to which they were experiencing mood states like enthusiasm or engagement, or anger or fear (the Positive and Negative Affect Schedule, or PANAS). That is different from directly measuring emotions (and just how would we really do that?).

I do not mean to say that the study isn’t meaningful, and I’m not suggesting that it is misleading. On the contrary, the authors were careful to design studies that creatively come up with measurements and exposures to nature or to urban settings that allow different groups of people to be compared.

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