Vaccine frontiers: how to treat established disease

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Psychological research is advancing our understanding of how time in nature can improve our mental health & sharpen our cognition


American Psychological Association. (2020, April 1). Nurtured by nature. Monitor on Psychology, 51(3). Https://www.nhatroso.com/monitor/2020/04/nurtured-nature
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Be honest: How much time vị you spend staring at a screen each day? For most Americans, that number clocks in at more than 10 hours, according lớn a 2016 Nielsen Total Audience Report. Our increasing reliance on technology, combined with a global trend toward urban living, means many of us are spending ever less time outdoors—even as scientists compile evidence of the value of getting out into the natural world.

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From a stroll through a thành phố park lớn a day spent hiking in the wilderness, exposure khổng lồ nature has been linked to lớn a host of benefits, including improved attention, lower stress, better mood, reduced risk of psychiatric disorders và even upticks in empathy and cooperation. Most research so far has focused on green spaces such as parks and forests, & researchers are now also beginning lớn study the benefits of blue spaces, places with river và ocean views. But nature comes in all shapes & sizes, và psychological research is still fine-tuning our understanding of its potential benefits. In the process, scientists are charting a course for policymakers và the public khổng lồ better tap into the healing powers of Mother Nature.

“There is mounting evidence, from dozens and dozens of researchers, that nature has benefits for both physical và psychological human well­being,” says Lisa Nisbet, PhD, a psychologist at Trent University in Ontario, Canada, who studies connectedness lớn nature. “You can boost your mood just by walking in nature, even in urban nature. And the sense of connection you have with the natural world seems lớn contribute khổng lồ happiness even when you’re not physically immersed in nature.”

Cognitive benefits

Spending time in nature can act as a balm for our busy brains. Both correlational and experimental research have shown that interacting with nature has cognitive benefits—a topic University of Chicago psychologist Marc Berman, PhD, & his student Kathryn Schertz explored in a 2019 review. They reported, for instance, that green spaces near schools promote cognitive development in children and green views near children’s homes promote self-control behaviors. Adults assigned to public housing units in neighborhoods with more green space showed better attentional functioning than those assigned to units with less access lớn natural environments. & experiments have found that being exposed lớn natural environments improves working memory, cognitive flexibility và attentional control, while exposure lớn urban environments is linked to lớn attention deficits (Current Directions in Psychological Science, Vol. 28, No. 5, 2019).

Researchers have proposed a number of ideas khổng lồ explain such findings, as Nisbet and colleagues described in a đánh giá of the benefits of connection with nature (Cnhatroso.comldi, C.A., et al., International Journal of Wellbeing, Vol. 5, No. 4, 2015). The biophilia hypothesis argues that since our ancestors evolved in wild settings and relied on the environment for survival, we have an innate drive lớn connect with nature. The stress reduction hypothesis posits that spending time in nature triggers a physiological response that lowers găng levels. A third idea, attention restoration theory, holds that nature replenishes one’s cognitive resources, restoring the ability to concentrate và pay attention.

The truth may be a combination of factors. “Stress reduction & attention restoration are related,” Nisbet points out. “And because of the societal problems we’re dealing with in terms of stress, both of these theories have gotten a lot of attention from researchers.”

Experimental findings show how impressive nature’s healing powers can be—just a few moments of green can perk up a tired brain. In one example, Australian researchers asked students to lớn engage in a dull, attention-draining task in which they pressed a computer key when certain numbers flashed on a screen. Students who looked out at a flowering green roof for 40 seconds midway through the task made significantly fewer mistakes than students who paused for 40 seconds khổng lồ gaze at a concrete rooftop (Lee, K.E., et al., Journal of Environmental Psychology, Vol. 42, No. 1, 2015).

Even the sounds of nature may be recuperative. Berman & colleagues found that study participants who listened to nature sounds lượt thích crickets chirping and waves crashing performed better on demanding cognitive tests than those who listened lớn urban sounds like traffic & the clatter of a busy café (Van Hedger, S.C., et. Al., Psychonomic Bulletin & Review, Vol. 26, No. 2, 2019).

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Nature & happiness

While such laboratory experiments are intriguing, they don’t fully capture the diverse benefits that go hand in hand with time spent in the outdoor world, says Cynthia Frantz, PhD, a professor of psychology và environmental studies at Oberlin College in Ohio. “Spending time in nature has cognitive benefits, but it also has emotional & existential benefits that go beyond just being able khổng lồ solve arithmetic problems more quickly,” she notes.

In a đánh giá of the research, Gregory Bratman, PhD, an assistant professor at the University of Washington, and colleagues shared evidence that tương tác with nature is associated with increases in happiness, subjective well-being, positive affect, positive social interactions và a sense of meaning và purpose in life, as well as decreases in mental distress (Science Advances, Vol. 5, No. 7, 2019).

Other work suggests that when children get outside, it leaves a lasting impression. In a study of residents of Denmark, researchers used satellite data to assess people’s exposure to lớn green space from birth lớn age 10, which they compared with longitudinal data on individual mental health outcomes. The researchers examined data from more than 900,000 residents born between 1985 và 2003. They found that children who lived in neighborhoods with more green space had a reduced risk of many psychiatric disorders later in life, including depression, mood disorders, schizophrenia, eating disorders and substance use disorder. For those with the lowest levels of green space exposure during childhood, the risk of developing mental illness was 55% higher than for those who grew up with abundant green space (Engemann, K., et al., PNAS, Vol. 116, No. 11, 2019).

There is even evidence that images of nature can be beneficial. Frantz & colleagues compared outcomes of people who walked outside in either natural or urban settings with those of people who watched videos of those settings. They found that any exposure to lớn nature—in person or via video—led khổng lồ improvements in attention, positive emotions and the ability lớn reflect on a life problem. But the effects were stronger among those who actually spent time outside (Mayer, F.S., et al., Environment & Behavior, Vol. 41, No. 5, 2009).

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More recently, scientists have begun exploring whether virtual reality nature experiences are beneficial. In a nhận xét of this work, Mathew White, PhD, an environmental psychologist at the University of Exeter in England, và colleagues concluded that while the real deal is best, virtual reality can be a worthwhile substitute for people who are unable khổng lồ get outdoors, such as those with mobility problems or illness (Neuro­psychiatric Disease và Treatment, Vol. 14, 2018).

Nature might also make us nicer—to other people as well as to lớn the planet. John Zelenski, PhD, a professor of psychology at Carleton University in Ontario, Canada, & colleagues showed undergraduates either nature documentaries or videos about architectural landmarks. Then the participants played a fishing trò chơi in which they made decisions about how many fish khổng lồ harvest across multiple seasons. Those who had watched the nature video were more likely khổng lồ cooperate with other players, & also more likely to lớn make choices that would sustain the fish population (Journal of Environmental Psychology, Vol. 42, No. 1, 2015). In another experiment, Zelenski và his colleagues found that elementary school children acted more prosocially to classmates & strangers after a field trip khổng lồ a nature school than they did after a visit khổng lồ an aviation museum (Dopko, R.L., et al., Journal of Environmental Psychology, Vol. 63, No. 1, 2019).

Those generous behaviors weren’t attributed to lớn students’ moods, Zelenski & his colleagues found, so it wasn’t simply that spending time in nature made them happier & therefore more giving. Another plausible (though unproven) explanation is the emotion of awe. “There are some hints that awe is associated with generosity, & nature can be a way to lớn induce awe,” he says. “One of the things that may come from awe is the feeling that the individual is part of a much bigger whole.”

Experience vs. Connection

With so many benefits linked khổng lồ nature, people naturally wonder: How much time outside is enough? White và colleagues took a stab at answering that question by studying a representative sample of nearly 20,000 adults across the United Kingdom. They found people who had spent at least two recreational hours in nature during the previous week reported significantly greater health và well-being. That pattern held true across subgroups including older adults and people with chronic health problems, và the effects were the same whether they got their dose of nature in a single 120-minute session or spread out over the course of the week (Scientific Reports, Vol. 9, No. 1, 2019). “We’re not saying we’ve cracked this nut yet, but this is a first step toward making specific recommendations about how much time in nature is enough,” white says.

The amount of time one spends in nature isn’t the only element lớn consider—it’s also beneficial khổng lồ feel connected to lớn the natural world even when you’re stuck at a desk. Researchers hotline this feeling by a variety of names, including nature relatedness, connectedness to nature & inclusion of nature in self, và they’ve developed a number of scales lớn measure the trait.

Whatever you hotline it, connectedness lớn nature seems khổng lồ benefit mood và mental health. In a meta-analysis, Alison Pritchard, PhD, ABPP, at the University of Derby in England, & colleagues found that people who feel more connected to nature have greater eudaimonic well-being—a type of contentment that goes beyond just feeling good và includes having meaningful purpose in life (Journal of Happiness Studies, online first publication, 2019).

Zelenski & Nisbet studied whether connection itself is the magic ingredient. They assessed the overlap between connectedness with nature và a general sense of connectedness, such as feeling in tune with one’s friends or community. They found that feeling connected lớn nature was a significant predictor of happiness even after controlling for the effects of general connectedness (Environment và Behavior, Vol. 46, No. 1, 2014). “People who feel that their self-concept is intertwined with nature report being a bit happier,” says Zelenski. “Nature connectedness isn’t the biggest predictor of happiness, but is quite consistent.”

In fact, nature might help to buffer the effects of loneliness or social isolation. White & his colleagues surveyed 359 U.K. Residents about their social connectedness và proximity lớn nature over the previous week. Social isolation is typically associated with worse subjective well-being. But the researchers found that when people with low social connectedness had high levels of nearby nature, they reported high levels of well­being (Cartwright, B.D.S., et al., International Journal of Environmental Research and Public Health, Vol. 15, No. 6, 2018). “There are people who don’t necessarily want lớn spend their time with others, but they feel connected to lớn the natural environment, and that can enhance their well-being,” trắng says.

Green và blue spaces

It’s clear that getting outside is good for us. Now, scientists are working lớn determine what types of environments are best. Much attention has gone khổng lồ green spaces, but white has studied a variety of marine and freshwater environments & found these blue spaces are also good for well-being (Gascon, M., et al., International Journal of Hygiene và Environmental Health, Vol. 220, No. 8, 2017.) In fact, he says, they may even be slightly more restorative than green spaces.

There may also be value in trekking khổng lồ remote locations. In a survey of 4,515 U.K. Residents, trắng found that people reported more connection khổng lồ nature & felt more restored after visiting rural và coastal locations than they did after spending time in urban green spaces. Areas deemed lớn be “high environmental quality”—such as nature reserves & protected habitats—were also more beneficial than areas with low biodiversity (Wyles, K.J., et al., Environment and Behavior, Vol. 51, No. 2, 2019). In other work, White & his colleagues found that people who watched nature videos with a diverse set of flora & fauna reported lower anxiety, more vitality và better mood than those who watched videos featuring less biodiverse landscapes (Wolf, L.J., et al., PLOS ONE, Vol. 12, No. 1, 2017).

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But there’s an important caveat, white adds: “If you have a break from work và you’ve only got half an hour, then a wild remote place is no use khổng lồ you at all.” Urban parks & trees also produce positive outcomes. Just like a little exercise is better than none, we should take­ advantage of green and blue spaces wherever & whenever we can. That’s easier said than done, though, especially for people at a socioeconomic disadvantage. Poorer neighborhoods, trắng notes, are seldom the ones with leafy groves & ocean views.

Yet policymakers, đô thị planners, environmental organizations and government agencies are coming around to lớn the importance of natural spaces, & psychologists are offering them their expertise, says White, who has presented his research to lớn groups such as the U.K.’s Department for Environment, Food và Rural Affairs. Organizations and cities are expressing interest in this research, Zelenski says, though many policymakers are waiting to see the results of intervention studies before investing in green infrastructure. One of the United Nations’ sustainable development goals includes the target of providing universal access khổng lồ safe, inclusive and accessible green và public spaces by 2030.

There is urgency in fostering these connections, says Nisbet. Because while people benefit from their connection with the natural world, the environment also benefits when people feel connected & committed to lớn caring for the Earth—and between climate change and habitat loss, the planet is in serious need of some care. “When people are disconnected from nature, they aren’t motivated to work on wicked problems like climate change. We’re losing the environments that contribute khổng lồ our flourishing,” she says. “The key question is, How bởi we help people feel connected to lớn nature so we’re motivated lớn protect the places that will help us thrive?”