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Students & Staff Reading Recent Research Blog

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8/19/21 Blog Post
Author: Olivia Poole
About the Author: Olivia Poole is a third year at Northwestern University studying social/environmental policy and data science. She is passionate about using environmental policy and science to narrow healthcare disparities, and also very interested in urban agriculture and food sovereignty. 


Effects of vacant lots on human health: A systematic review of the evidence

Research shows a vacant lot is not empty – it holds health risks and benefits.
Published in April 2021, this article aimed to answer the research question: How do poor quality greenspaces (e.g. vacant lots) influence health? While there are some limiting factors to this study and review, they point to opportunities for more research in this field.

After conducting a systematic review, the researchers consolidated the current literature about the effects of vacant lots on human health to summarize findings and identify gaps in the existing body of evidence to suggest future research.

Using PRISMA guidelines – the global standard for systematic and scoping literature reviews – the researchers found 438 articles, which were winnowed to 22; 11 used controlled experimental designs. 

The researchers broke down the results from the selected articles into several categories but did not use a specific coding mechanism/scheme/framework at this point. Subsequently, they split the results into two categories of investigation: health outcomes (like stress) and health risks (like crime). 

The reported health outcomes were stress, mental health, self-reported physical activity, heart rate, homicide rates, and blood lead levels. The reported health risks were crime, gun violence, insect vectors, parasites, heavy metal contamination and injuries.

Among the 11 experimental studies, 73% showed that “greening” of vacant lots improved health; 18% showed some neutral effects; and one study showed a decline in health.

Following the results, the researchers included a section on the limitations they found, to inform readers of potential areas of study. 

The main limitations of the evidence presented in the articles analyzed were the narrow health outcomes investigated, small sample size, the short follow-up times, and the limited geographic scope of the studies.

Overall, however, the article provided an efficient but encompassing review of the current knowledge, as well as the gaps, about how vacant lots, and the greening of them, impact human health. 
Several points are worth noting:  The extensive introduction describes “pathways” – both direct and indirect – by which greenspace exposure could improve health provides valuable information for in diverse stakeholders interested in the health benefits of nature. Further, the need for longitudinal research, mentioned in the “future directions” section, is a call to action for all researchers in the field.
The Journal of Landscape and Urban Planning is one of an increasing number of journals that includes a section on policy implications of article. Including policy implications in more papers would be incredibly useful to those of us working at the intersection of research and policy outcomes.

- Olivia Poole

Source Article: 
Sivak, C. J., A. L. Pearson and P. Hurlburt (2021). "Effects of vacant lots on human health: A systematic review of the evidence." Landscape and Urban Planning 208: 104020. http://www.sciencedirect.com/science/article/pii/S0169204620315048

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8/5/21 Blog Post
Author: Arseniy Minasov
About the Author: Arseniy Minasov is the Research Coordinator at Northwestern’s Department of Anthropology (Dr. Horton Research Group): Health Benefits of Nature. He graduated from Northwestern in 2018 with a B.A. in Biological Anthropology. He studies technology, gaming, and the intersection of nature-based interventions with technology and medicine, while also enjoying competitive gaming and triathlons.

​
Can Simulated Nature Support Mental Health? Comparing Short, Single-Doses of 360-Degree Nature Videos in Virtual Reality With the Outdoors.
​
Don’t Count VR Out of Providing the Benefits of Nature.
Virtual Reality (VR), one of the newest and most powerful technological advancements, may help connect the realms of technology and psychology. VR, used in fields of both medicine and entertainment, is a simulated environment that displaces the user through visual and auditory stimuli into another environment.

With the dual aspects of increased realism and escapism, VR may offer a replacement for visual and auditory stimulation when it comes to simulating real-world psychological benefits, such as exposure to nature and open space/green space.  A VR intervention would, expectedly, be weaker than a real exposure to nature, but those for whom a real-life encounter is impossible may benefit from the virtual experience.


In a 2020 study, researchers at the University of Illinois at Urbana-Champaign sought to understand where along the spectrum of “no physical exposure to nature” to “extensive exposure to nature” VR lies. Participants indicated their “nature preferences” using beauty-and-disgust surveys. Then, in the trial, participants were randomly assigned to sit in one of three places:  (A) facing a white wall, (B) outdoors in nature, or (C) indoors with a VR representation of the same nature space as group B. 

Researchers measured the mood, restorativeness, and skin conductivity levels (SCL) of each participant. Overall, the study found that VR can simulate nature to some extent – with a noticeable difference between no-nature and VR when it came to mood – but VR does not come close to the real-nature intervention.

The study appears to show that VR cannot simulate nature to the extent that would be beneficial on a widespread, unconditional basis.  There are, however, several limitations in the study that merit additional attention. 

First, the VR technology used in the study was from 2015 and found on a Samsung smartphone – not a stand-alone or PC-compatible native VR headset. The differences in quality between those are stark, and despite dramatic advances in a phone’s VR potential in recent years, it is not nearly as powerful as some higher-end VR machines now available. 

Second, the study itself mentions several of its own limitations, such as the fact that its college-student cohort was not ideal for observing changes in psychological variables. (These limitations ring true to our own studies at Northwestern University with actual nature exposure as well.) Nevertheless, with VR still in its relative technological infancy, we should not discredit or discount the idea of having these technological marvels in our own homes and potentially in hospitals to give people who need nature access the possibility of receiving it. 

- Arseniy Minasov
​

Source Article: ​Browning, M., K. J. Mimnaugh, C. J. van Riper, H. K. Laurent and S. M. LaValle (2019). "Can Simulated Nature Support Mental Health? Comparing Short, Single-Doses of 360-Degree Nature Videos in Virtual Reality With the Outdoors." Frontiers in Psychology 10: 2667. https://www.ncbi.nlm.nih.gov/pubmed/32010003


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7/22/21 Blog Post
Author: Peyton Meyer 
About the Author: Growing up just outside of Madison, Wisconsin, Peyton Meyer (he/him) is an undergraduate student at Yale University, with interests in psychology, mental health advocacy, and environmentalism. As an avid cross country skier, and having served as garden chair in his hometown's community garden, Peyton has seen firsthand the unique effects that nature can have on the mind, a driving factor behind his participation in nature-based intervention research over the past year.

​
An Abundance of Nature and Free Time: The COVID-19 Pandemic’s Effects on Human-Nature Interactions & Potential Policy Applications
Amid stay-at-home orders and social distancing, human-nature interactions saw significant changes during the COVID-19 pandemic. In April 2021, Soga et al. published “Impacts of the COVID‐19 pandemic on human–nature interactions: Pathways, evidence and implications” in the journal People and Nature (Soga et al., 2021). The authors propose a conceptual framework describing the pathways by which COVID-19 may affect human-nature interactions and resulting feedback loops (Figure 1). The authors emphasize that effective policies should minimize human-nature interactions with negative consequences, and maximize those with positive consequences, to benefit individuals’ health, safety, and motivation to get outdoors.
Though its conclusion feels obvious, the framework merits further investigation. It demonstrates how one consequence can have lasting impacts on future human-nature interactions through the three pathways and feedback loops, and how these may be modified by COVID-19 (Figure 1). Such reasoning could provide strong support for policies related to nature conservation, establishing natural spaces, and accessibility of natural spaces.

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A positive feedback loop would lead to further increases in human-nature interactions. For example, if people have more free time to spend with nature (Pathway 1), which improves their mental health (Pathway 2), this may increase motivation for future visits to nature (Pathway 3). A negative feedback loop would be where increases in human-nature interactions lead to decreases, or vice versa. For example, again, if people have more free time to spend with nature (Pathway 1), they may have more chances of injuring themselves while out (Pathway 2). The natural areas’ quality could also decrease from overuse without proper maintenance, which could lead to people being less interested in spending their time there (Pathway 3).
Looking deeper, the study can be broken into three key parts: an initial investigation of the pandemic’s impacts on human-nature interactions, creating the conceptual framework, and an analysis of potential feedback loops. Human-nature interactions were investigated using data from around the world recorded before and during the pandemic. The data analyzed ranges from greenspace/forest visits to wildlife-vehicle collisions per day (Figure 2)
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Though often increasing in quantity, the data suggest that human-nature interaction frequency during the pandemic likely depends on where a person lives and the local norms/policies. Greenspace/forest visits are seen to increase in graphs a-d, while decreasing in the UK (e) (Figure 2). Further, wildlife observations decreased in South Africa and wildlife-vehicle collisions decreased in California. Overall, it is the conceptual framework that could explain the variety of these results. Thus, the conceptual framework shows real promise for applications to reasoning and supporting related policies.

- Peyton Meyer


Source Article: Soga, M., M. J. Evans, D. T. C. Cox and K. J. Gaston (2021). "Impacts of the COVID‐19 pandemic on human–nature interactions: Pathways, evidence and implications." People and Nature.  https://besjournals.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/pan3.10201 ​
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