Watching short videos of forests and streams can help your mind recover from stress, even without stepping outside.
What 10 minutes of forest footage does to your mood
The researchers first showed the volunteers a clip that showed factory workers slipping off ladders and getting hit by falling equipment. By the time it ended, nearly a thousand volunteers were sweating more and their reported fear and anger were climbing.
Then the researchers split them up and sat them in front of a second video. Some watched a forest. Some watched a rushing stream. The rest watched city sidewalks and traffic intersections.
The people who watched the forest and the stream felt better afterward than the people who watched the street. Not by magic, and not by a huge margin, but by enough to measure across 10 separate labs in 5 countries.
That result comes from a 2026 study, the largest test yet of a claim that has shaped hospital design, office layouts, and waiting-room screens for three decades. The claim is simple enough to test at your desk today. When you can’t get outside, a nature video on your screen can help pull your mood back up after something rattles you.
The original study that put nature on hospital walls
The idea traces to Roger Ulrich, an environmental psychologist who ran an experiment in the late 1980s with 120 people. He stressed them with a black-and-white film about workplace accidents, then showed them videos of either natural or urban settings. The nature-watchers recovered faster on almost every measure Ulrich tracked, including heart rate, muscle tension and blood pressure.
Ulrich built a Stress Reduction Theory on top of his finding, and its logic runs deep into human history. Our ancestors spent most of their existence in green, watered places that meant food and safety, so the brain may carry a built-in preference for those scenes. Concrete and traffic are recent inventions by comparison, and we never evolved a calming response to them.
The paper collected more than 9,000 citations and became one of the most-cited works in its field. Its practical footprint is everywhere once you look. The nature photo bolted to the ceiling above a dentist’s chair, the forest mural in a chemo ward, the beach screensaver in an open-plan office all trace back, in part, to Ulrich’s result.
One problem nagged at researchers for 35 years. Nobody had directly repeated the experiment.
What the replication study found
A team led by Agnes van den Berg at the University of Twente set out to fix that gap. They pulled together 10 labs across the Netherlands, Belgium, the UK, Sweden and the United States, and ran nearly 1,000 people through a close copy of Ulrich’s original design.
Each person watched a 10-minute compilation of industrial accidents to spike their stress. The team confirmed it worked. Fear, anger, and sadness all climbed, positive mood dropped, and the body followed with more sweating and shifts in heart activity. Then each person was randomly handed one of six 10-minute videos: a forest, a stream, quiet or busy pedestrian areas, or quiet or busy traffic.
On the mental side, nature won. People who watched the forest or stream reported the largest gains in positive mood and the steepest drops in anger, ahead of the pedestrian group, with the traffic group recovering least.
Sweat response and one cardiac marker of “fight or flight” arousal calmed down in everyone, no matter what they watched, with no nature advantage.
Feeling calm and being calm aren’t the same
People felt clearly better after nature, while their bodies recovered at about the same rate regardless of the video. As Aaron Hipp, a professor at North Carolina State University and a co-author, put it, people experienced “small but consistent improvements” even without being outdoors, with the effect landing more on the mind than the body in the short term.
This means that self-reported mood improves reliably after nature contact, while physical stress markers move less and less consistently. A screen full of trees is good at changing how you feel. It’s slower at changing what your heart does.
The forest beat the stream
Forest-watchers calmed down and returned to their baseline stress level by the end of the recovery period. Stream-watchers barely recovered at all, ending up about as tense as they’d been right after the accident film, closer to the city-watchers than to the forest group.
The team’s best guess points at sound. The stream in their video was a fast, cascading flow with high-decibel rushing water, louder than the gentle trickle in Ulrich’s original. Loud water may cross a line from soothing to intrusive. So the takeaway isn’t “any nature clip works.” It’s that a quiet forest is a safer bet than a roaring waterfall.
How to use nature videos when you can’t get outside
The appeal here is access. Getting into real green space is the best, but if you don’t have a park within a 10-minute walk of home a phone and a free video sidestep that gap.
You won’t turn into a different person after one video. The study’s own authors are careful about that. What you get is a small, reliable nudge toward feeling steadier, the kind of thing that adds up when you reach for it often.
Examples of forest videos
The bottom line
The next time a bad email or a tense call leaves you rattled and you can’t step outside, cue up 10 minutes of quiet forest footage and let it run. The science says your mood will thank you even if your heart rate takes its time. Keep a couple of calm nature clips bookmarked the way you’d keep a good song ready, and you’ll have a reset button that works from any chair on any screen.
Frequently asked questions
They produce a measurable effect on mood, confirmed across 10 labs and 959 people in a 2026 replication (Van den Berg et al., 2026). People recovered more positive feeling and less anger after watching forest and stream videos than after city scenes. The mental benefit is consistent, though the physical stress recovery is smaller and less certain, so the honest answer is that it’s real but modest.
The studies used 10-minute clips, but the strongest physical responses showed up in the first 3 minutes. Even a 2-minute video can help, which is why NC State professor Aaron Hipp uses short clips to reset his students after long lectures. Start with 5 to 10 minutes and adjust to what fits your break.
Calm forest scenes with soft, quiet sound worked best in the research. A loud, fast-rushing stream barely helped at all, likely because the high-volume water read as noise (Hsieh et al., 2023). Choose still or slow-moving green scenes with gentle ambient audio, and avoid crashing water or dramatic footage.
No. Real time in nature is the stronger option and may offer benefits, like immune support and longer-lasting resilience, that a screen can’t match. Nature videos are a practical stand-in for when getting outdoors isn’t possible, such as during a hospital stay, a windowless workday, or a short break with no green space nearby.
Self-reported feelings come from higher brain processes that weigh mood, thoughts, and context, and those respond quickly to a pleasant scene. Physical stress markers like heart rate move more slowly and less predictably, a gap seen across many reviews (Bowler et al., 2010). In the short term, a nature video shifts how you feel faster than it shifts what your body is doing.
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