A review of 54 studies spanning nearly three decades found that time in natural environments can improve cognition and mood even when people begin from a neutral state, suggesting nature may support everyday mental performance rather than serving only as a recovery tool after stress.
By yourNEWS Media Newsroom
Spending time in nature may strengthen mood and cognitive performance even when people are not already stressed, mentally fatigued or emotionally depleted, according to a new review examining decades of research on the psychological effects of natural environments.
The analysis reviewed 54 studies published between 1996 and 2024 and included 61 separate experiments comparing exposure to nature with urban environments or other conditions. Researchers examined both direct experiences, such as time spent in parks and forests, and indirect exposure through photographs of natural settings and recordings of birdsong.
The findings challenge a longstanding emphasis within environmental psychology that has primarily treated nature as restorative — something people turn to after stress, mental exhaustion or prolonged concentration.
Instead, the review suggests natural environments may also have what researchers describe as an “instorative” effect, meaning they can enhance psychological functioning even when a person begins from an ordinary, unstressed baseline.
The review was described in an article published by mindbodygreen on Aug. 3, 2026.
Most of the experiments included in the analysis followed the traditional restorative model.
Of the 61 experiments, 45 first placed participants under stress or mental fatigue before exposing them to a natural environment or nature-related stimulus. Eight experiments instead began with participants who had not undergone a prior stress or fatigue condition.
That distinction produced one of the review’s most notable findings.
Among the restorative studies, approximately two-thirds of the experiments measuring cognitive performance reported positive effects following exposure to nature.
By comparison, all four instorative experiments that measured cognition reported improvements, according to the review.
Researchers observed similarly favorable patterns in other psychological measures.
All three instorative experiments that assessed perceived restoration — essentially how refreshed or renewed participants felt — found positive effects.
Mood outcomes were also generally favorable. Of six measurements involving mood under instorative conditions, four showed benefits, one produced mixed findings and one found no statistically significant effect.
The results add to a broader body of research associating green spaces and other natural environments with mental and physical health benefits, as discussed by Evangelyn Rodriguez in NaturalNews.com.
The review’s authors argued that previous research may have placed too much emphasis on nature as an intervention for people who are already depleted.
That approach has produced extensive evidence that forests, parks and other natural spaces can help people recover from psychological strain, but it has left comparatively less research examining whether nature can improve functioning before stress or fatigue occurs.
The newer findings suggest nature exposure could potentially be viewed as routine mental maintenance rather than something reserved for moments of distress.
The instorative studies examined in the review involved an average of approximately 28 minutes of exposure to nature.
Researchers said that duration suggests relatively short, regular periods in natural environments may be sufficient to produce measurable psychological effects, though the review does not establish 28 minutes as a definitive minimum or ideal dose.
The concept is consistent with earlier research examining how quickly people may experience benefits from natural environments.
Richard Louv wrote in “The Nature Principle” that “mood and self-esteem improved after a five-minute dose” of nature, citing research from the University of Essex examining dose-response relationships between nature exposure and psychological health.
The findings also support the idea that natural environments need not be reserved for weekends, vacations or periods of severe stress.
Brief outdoor exposure incorporated into ordinary routines could potentially support attention, thinking and emotional well-being before those capacities become depleted.
A 2025 article on NaturalNews.com similarly reported that walking in nature for 15 minutes each day can “improve your mood and cognitive function” while also reducing anxiety, depression and fatigue.
The review additionally found that people may obtain some psychological benefits from representations and sounds of nature even when access to outdoor green space is limited.
Experiments using nature photographs and birdsong reported measurable changes in cognition and mood, according to researchers.
That finding could have practical implications for people who work indoors, live in densely developed areas or face mobility and access limitations that prevent regular visits to forests, trails or parks.
Separate research published in 2026 found that listening to one minute of local birdsong improved mood and reduced stress.
Such findings suggest some aspects of natural environments may influence psychological state even without prolonged physical immersion in an outdoor setting.
Researchers nevertheless emphasized that the evidence for instorative effects is less developed than the much larger body of work examining stress recovery.
Only eight of the 61 experiments included in the review used an instorative design, leaving a substantially smaller evidence base from which to draw conclusions.
Additional research involving larger and more diverse populations will be necessary to determine how consistently those benefits appear and whether factors such as age, environment, duration, activity and type of nature exposure affect the results.
Researchers also need to determine whether repeated nature exposure produces lasting improvements or whether the observed effects are primarily short-term.
Despite those questions, the review broadens the way scientists may think about the relationship between natural environments and psychological health.
Rather than viewing nature solely as a way to recover after work-related stress, emotional strain or cognitive fatigue, the findings suggest exposure could potentially help maintain mental performance before those problems develop.
That interpretation aligns with research surrounding practices such as forest bathing, which involves intentionally spending time among trees and other natural environments.
Dr. Qing Li, author of “Forest Bathing: How Trees Can Help You Find Health and Happiness,” has discussed phytoncides — antimicrobial compounds released by trees — and their possible relationship to mood, anxiety and immune function.
Li has said forest bathing produces measurable positive effects on both mood and immune function and that phytoncides can help lift depression and reduce anxiety.
The broader body of research does not mean nature exposure should be treated as a substitute for medical care or established treatments for mental health conditions.
Instead, the new review suggests ordinary contact with natural environments may represent an accessible way to support psychological well-being alongside other healthy habits.
The distinction between restorative and instorative effects could prove particularly important for future research.
If natural environments improve cognition and mood even when people are already functioning normally, their value may extend beyond recovery and into prevention, maintenance and everyday performance.
For individuals, that could mean treating time outside as a regular part of a daily routine rather than waiting until stress or fatigue has already accumulated.
For researchers, the findings open another area of investigation into how exposure to parks, forests, natural imagery and sounds such as birdsong influence attention, mood and perceived restoration.
The current evidence remains preliminary because the number of instorative experiments is relatively small, but the consistent cognitive improvements reported across those studies provide a basis for more rigorous work.
Taken together, the research suggests the psychological value of nature may not depend on a person first becoming overwhelmed. Even during an ordinary day, a relatively brief encounter with natural surroundings may be enough to improve how a person feels and thinks.
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