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Vitamin G: How a Daily Dose of Green Improves Brain Function

by Craig Weatherby

vitamin green - good for the brain

Can wilderness and waterside walks lift mood, relieve stress…and allow the aimless reflection that helps balance and focus our minds and spirits?

As John Muir wrote, “Everybody needs beauty as well as bread, places to play in and pray in, where nature may heal and give strength to body and soul.”

But, to quote a certain 1980’s hair band from Boston, is this “more than a feeling”?

It turns out that in fact, conventional wisdom about the restorative power of nature enjoys an increasing amount of scientific evidence.

The human brain’s ability to stay calm and focused can be swamped by the insistent attention demands and sensory distractions of urban and office living.

Over the course of hours, days, and weeks, this sensory/attention overload leads to the “brain fatigue” that makes people in cities and offices distracted, irritable, and less effective.

Nature proves restorative…the wilder the better

Many studies have now been conducted, all designed to test something called Attention Restoration Theory (ART).

The goal has been to quantify the restorative powers of nature and discover how natural settings enhance people’s thinking and mood. These studies suggest that natural settings like parks and woodlands refresh the brain, and may even improve physical health. So we’re calling this nutrient “Vitamin G,” and we need to make sure we get our daily allowance of getting outside and enjoying some Green.

Natural environments – even simulated ones provided by murals – improved study participants’ moods, levels of relaxation, and capacity for “directed attention”…the ability to focus on tasks and maintain calm.

Several years ago, University of Michigan scientists reported on two “experiments that show that walking in nature or viewing pictures of nature can improve directed-attention abilities…thus validating attention restoration theory.” (Berman MG et al. 2008)

And addressing the reasons for nature’s brain benefits, they noted that “Nature, which is filled with intriguing stimuli, modestly grabs attention in a bottom-up fashion, allowing top-down directed-attention abilities a chance to replenish.”

In contrast, they wrote, “…urban environments are filled with stimulation that captures attention dramatically and additionally requires directed attention (e.g., to avoid being hit by a car), making them less restorative.” (Berman MG et al. 2008)

And indoor environments are ruled by straight lines and flat, smooth surfaces, with none of the random or “fractal” shapes and movements seen everywhere in nature.

Objective scientific tests show that natural environments accelerate recovery from surgery and restore people’s ability to engage in directed attention…which cannot be sustained indefinitely.

Compared with people who live amid concrete, those who dwell near nature enjoy lower levels of the stress hormone cortisol, while children with attention problems performed better on cognitive tests after walking through natural settings.

Scandinavian and student research affirms nature’s relaxing power

Finnish researchers reported in 2010 that most of 1,273 study participants believed that time spent in their favorite outdoor areas and woodlands were more relaxing and restorative than time spent in their favorite built-up urban settings or city parks (Korpela KM et al. 2010).

Encouragingly, those who had the most stress reported the greatest relief from time in relatively untamed nature.

However, those who needed nature the most were the least likely to seek it out:

“The more worries about money and work a person had, the more stressed a person had felt during the last year, the less energetic she/he had felt, the lower was the number of visits to the favorite place (during the last 6 months) and the lower the typical level of restorative experiences.”

The lesson, it seems, is that if you are feeling stressed, depressed, or frazzled, it’s harder but even more important to get yourself into the woods.

Portable brain scans affirm nature’s brain benefits

Harder evidence came from clinical studies employing the electroencephalogram (EEG)…a device that reads brain waves.

Volunteers in labs were shown photographs of either natural or urban scenes with electrodes attached to their heads. Their brain waves displayed more characteristics of calm in response to the nature scenes.

But until the recent advent of a portable electroencephalogram, it wasn’t possible to study peoples’ brains while they were walking through urban areas and green parks.

Now, a novel study from Scotland provides hard evidence that nature actually affects brain function in beneficial ways.

Scottish study read brain waves on the move

Researchers from Edinburgh’s Heriot-Watt University and the University of Edinburgh attached a portable EEG called the Emotiv EPOC to the scalps of 12 healthy young adults, under an ordinary cap (Aspinall P et al. 2013).

The electrodes sent brain readings wirelessly to laptops carried in the participants’ backpacks.

All 12 volunteers took a walk of about a mile and half through three distinctly different areas of Edinburgh, lasting about 25 minutes:

Zone 1 – Shopping district with historic brick buildings, moderate pedestrian traffic, and light vehicle traffic.
Zone 2 – Park-like green space.
Zone 3 – Busy commercial district with heavy auto traffic and concrete buildings.

The Emotiv EPOC provided continuous recordings from brain-wave channels associated with five different states:

Excitement
Frustration
Engagement (directed attention)
Long-term (LT) Excitement
Meditation

Afterwards, the scientists analyzed the volunteer’s brain wave records using a sophisticated new mathematical method.

The analysis showed evidence of lower engagement and arousal, and higher meditation when moving into the “green zone,” and higher engagement when moving out of it.

The walkers were still paying attention in the green zone, but it was the kind that brain researchers call “effortless” or “involuntary” attention.

In other words, effortless/involuntary attention allows us to reflect and it refreshes brains fatigued by the continuous attention demanded by offices and city streets.

As the Scottish team said, “Systematic differences in EEG recordings were found between three urban areas in line with restoration theory. This has implications for promoting urban green space as a mood-enhancing environment for walking or for other forms of physical or intellectual activity.”

The takeaway seems obvious…we should all take every opportunity to get outside and let our minds wander and wonder! A walk in the park…better yet, in the woods or along the water, can help people who feel blue or frazzled. Take a daily walk, ride, or paddle in the wildest places nearby and surround yourself with scenes of nature.

Sources

  • Berman MG, Jonides J, Kaplan S. The cognitive benefits of interacting with nature. Psychol Sci. 2008 Dec;19(12):1207-12. Accessed at http://www-personal.umich.edu/~jjonides/pdf/2008_2.pdf
  • Felsten G. Where to take a study break on the college campus: An attention restoration theory perspective. Journal of Environmental Psychology, Volume 29, Issue 1, March 2009, Pages 160-167. doi:10.1016/j.jenvp.2008.11.006. Accessed at http://www.sciencedirect.com/science/article/B6WJ8-4V42JCB-1/2/335e8930b7333f984a660cdd07941133
  • Korpela  KM et al. Favorite green, waterside and urban environments, restorative experiences and perceived health in Finland. Accessed at http://heapro.oxfordjournals.org/content/25/2/200.abstract
  • McKinney J. Thoreau Was Right: Nature Hones the Mind. Miller-McCune.com. January 11, 2011. Accessed at http://www.miller-mccune.com/health/thoreau-was-right-nature-hones-the-mind-26763/
  • Korpela KM, Ylén M, Tyrväinen L, Silvennoinen H. Favorite green, waterside and urban environments, restorative experiences and perceived health in Finland. Health Promot Int. 2010 Jun;25(2):200-9. Epub 2010 Feb 22.
  • Korpela KM, Ylén M, Tyrväinen L, Silvennoinen H. Determinants of restorative experiences in everyday favorite places. Health Place. 2008 Dec;14(4):636-52. Epub 2007 Oct 23.
  • Korpela KM, Ylén MP. Effectiveness of favorite-place prescriptions: a field experiment. Am J Prev Med. 2009 May;36(5):435-8. Epub 2009 Mar 6.
  • Stigsdotter UK, Ekholm O, Schipperijn J, Toftager M, Kamper-Jørgensen F, Randrup TB. Health promoting outdoor environments–associations between green space, and health, health-related quality of life and stress based on a Danish national representative survey. Scand J Public Health. 2010 Jun;38(4):411-7. Epub 2010 Apr 22.
  • Aspinall P, Mavros P, Coyne R, Roe J. The urban brain: analysing outdoor physical activity with mobile EEG. Br J Sports Med. 2013 Mar 6. [Epub ahead of print]
  • De Young R. Restoring the capacity to direct attention. Accessed at http://www-personal.umich.edu/~rdeyoung/publications/art.html
  • Groenewegen PP, van den Berg AE, de Vries S, Verheij RA. Vitamin G: effects of green space on health, well-being, and social safety. BMC Public Health. 2006 Jun 7;6:149.
  • Korpela KM, Ylén M, Tyrväinen L, Silvennoinen H. Favorite green, waterside and urban environments, restorative experiences and perceived health in Finland. Health Promot Int. 2010 Jun;25(2):200-9. doi: 10.1093/heapro/daq007. Epub 2010 Feb 22.
  • Maas J, van Dillen SM, Verheij RA, Groenewegen PP. Social contacts as a possible mechanism behind the relation between green space and health. Health Place. 2009 Jun;15(2):586-95. doi: 10.1016/j.healthplace.2008.09.006. Epub 2008 Oct 15.
  • Maas J, Verheij RA, de Vries S, Spreeuwenberg P, Schellevis FG, Groenewegen PP. Morbidity is related to a green living environment. J Epidemiol Community Health. 2009 Dec;63(12):967-73. doi: 10.1136/jech.2008.079038. Epub 2009 Oct 15.
  • van den Berg AE, Maas J, Verheij RA, Groenewegen PP. Green space as a buffer between stressful life events and health. Soc Sci Med. 2010 Apr;70(8):1203-10. doi: 10.1016/j.socscimed.2010.01.002. Epub 2010 Feb 12.
  • Wikipedia. Attention restoration theory. Accessed at http://en.wikipedia.org/wiki/Attention_Restoration_Theory

photo credit: goingslo cc

About the author...

 offers a brilliant point of reference in the natural products scene. Craig currently works with Vital Choice Wild Seafood & Organics, a leading online retailer of wild seafood and other certified organic foods. Craig's expertise centers around nutrition science, healthy eating, and sustainability issues particularly surrounding Omegas and wild fish harvesting.

Dawn May 7, 2013

This post is AWESOME! I think many of the mental problems we face as a society are due to our cultural divorce from being outdoors.

I’d love it if you linked this post at Small Footprint Fridays this week! The linky goes live around 9PM PST on Thursday. http://www.smallfootprintfamily.com/small-footprint-friday-sustainable-living-linkup-050313

Brad May 7, 2013

Thanks for the compliments and the invite Dawn. We’ll certainly be sure to drop by and link up on Thursday.

And you’re right. All of our brains and sanity can benefit from more time outside.

Karen @ Journey towards simplicity May 7, 2013

I just read a brief article on “earthing” and how vitamin G or grounding can help reduce symptoms of many ailments while enhancing other functions. It may require a literal connection with the earth however- sleeping on the soil, walking barefoot- so you can be in contact with the electron charged ground. Interesting concepts with growing evidence based research to back it up 🙂

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