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Hendrix Prather had a rough entry to school. When the now nine-year-old started kindergarten, he struggled to focus on his ABCs and counting,��chafing against the expectation that he sit still and be quiet. First grade brought more of the same. “There was a lot of discussion with his teachers about his participation in class, keeping him engaged and staying focused,” says his mother, Lindsay Prather. “He was capable, but couldn’t focus to move forward. He was labeled a problem kid.”

Lindsay pulled him out of his public school and homeschooled him for two years. Then, when Hendrix asked to return to a classroom for fourth grade, she enrolled him at a very different kind of institution: Woodson Branch Nature School in Marshall, North Carolina where she now serves as the school’s director of education. There, he spends the morning working on reading and math in the classroom, then moves outdoors for nature-based art projects, engineering assignments involving branches and rocks, and planting projects��in the school garden. Best of all, though, “Now I have an hour of forest time out in nature, and I get to go to a different place every day,” Hendrix says. “It helps me focus more and get my energy out.”

“Now he’s extremely focused during his academic time,” Lindsay says. “He’s just thriving academically.”

The Evidence Is Clear

Search the scientific literature, and you’ll find paper after paper reporting on nature’s cognitive benefits. Interacting with nature to pay attention and complete difficult mental tasks. Urban environments have the opposite effect. The nature effect is largely true across—even��with��short exposures to nature or��when subjects just looked at photos of wild places. around homes and schools correlate to better cognitive development in kids and better mental function ��in adults. Researchers have even documented physical changes to the brain with MRI scans: found kids with more access to green spaces had more gray matter, which is linked to higher-level thinking and processing. reported that simply showing people photos of nature improved connectivity between different parts of the brain.

The evidence that nature boosts brain power is “extremely strong,” says Marc Berman, director of the Environmental Neuroscience Laboratory at the University of Chicago.��“Our interaction with nature improves working memory performance and executive attention performance—those are the ones that keep replicating,” he says.

Executive attention, also known as executive functioning, simply means our ability to complete higher-level thinking. Being able to plan ahead, work toward goals, weigh complicated decisions, maintain focus, and keep control of emotions—all of these skills fall under executive function.��Neuroscientists think these skills originate in the prefrontal cortex, the front part of the brain that was the last to develop, evolution-wise (and individually, too—).

Rejuvenate Your Brain

Every school day, Hendrix spends his forest time in a creek, on a hill, or in the woods on Woodson Branch’s 30-acre campus. “You play in the creek–today I built a dam,” he says. “There are really good climbing trees, and you can build bridges. There’s also a big hill that’s really good for hide and seek.”

The case for nature’s benefits on the brain is so strong, Berman says, that the major research question has changed: “Now it’s about nailing down why.”

As anyone who’s spent too long staring at math problems or balance sheets knows: concentrating��on something gets exhausting. Not only that, but daily life for most of us is also full of distractions—everything from an officemate’s cell phone pinging to a flashing banner ad online to email alerts piling up to a screeching garbage truck out on the street—that grab our attention, often inadvertently. Switching attention from one thing to another is also cognitively taxing, says Jason Duvall, concentration advisor and lecturer at the University of Michigan’s Program in the Environment. “We don’t really do multitasking, we do task switching,” he says. “In order to do that, we have to keep each of those things active in the brain, so it can be recalled and we can return. For every task that we add, we get worse at any other subsequent task.”

The outdoors, on the other hand, is in many ways the opposite of the busy, distraction-packed world we live in. One of the leading explanations, , first introduced by University of Michigan environmental psychologists Stephen and Rachel Kaplan in 1989, posits that the outdoors allows the overtaxed prefrontal cortex to rest and replenish. ��Attention Restoration Theory says that nature inherently brings us to a state of “soft fascination”: We find natural settings interesting and pleasurable, but they don’t require a lot of mental effort. “We think nature puts your brain into a rest state, that allows you to rejuvenate your attention resources and get back to work again,” says Berman.

There may be other things going on, all of which could be complementing Attention Restoration Theory. Researcher Roger Ulrich proposed the Stress Reduction Theory in 1991, which says that nature promotes relaxing physiological effects in the body, like lowered heart rate and blood pressure. “When people are less stressed, they tend to be more expansive and creative in their thinking,” says Duvall.

There’s also a concept called perceptual fluency. “The idea is that elements of the natural environment tend to be easy for our visual system to process,” Duvall explains. “One explanation is that natural features have fractal patterns, or repeating patterns at different scales,” like snowflakes or tree branches. “From an information-processing perspective, the brain has an easier time making sense of what’s going on. That may explain why people feel more refreshed after those experiences—the cognitive load is lessened in natural environments.”

The why is important, but perhaps less critical than the simple fact that it just works: If a mountain of neuroscientific evidence tells us that regular nature exposure optimizes brain function, well, we should listen. Whether that means an hour of forest time at school, a daily bike ride, or a lunchtime walk around the park, getting outside is a lot more than just fun or relaxing. It’s essential.

NatureDose is an app that measures your therapeutic time in nature. Set your weekly goal, then go outside and feel good. .