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Liberal and conservative brains react to charged words differently
Partisanship can now be seen in brain scans.
- A new study shows brain activity differs between liberals and conservatives when they watch political videos.
- Brain activity differed between partisans when words tied to emotions, morality, or threats were used.
- The findings could help us understand how partisans process information, perhaps leading to new ways to bridge the divide.
People are somewhat politically polarized these days. While the United States' polarization gets most of the press, increasing polarization is also causing problems in the United Kingdom, Turkey, Poland, Brazil, India, and a variety of other countries around the world. Attempts to understand why are endless, with hypotheses being offered from various schools of sociology, political science, and philosophy.
Recently, scientists investigating partisanship have peered into the neurological basis for our partisan alignments, if any. Their discoveries suggest that partisans' brains may process information differently than those of non-partisans or members of another group.
Adding evidence to this way of thinking is a new study out of UC Berkeley, which finds that liberal and conservative brains react differently to political trigger words.
The study, published in the Proceedings of the National Academy of Sciences, compared the stated political opinions of three dozen test subjects to their brain wave patterns while they watched videos about immigration policy.
The researchers, led by Dr. Yuan Chang Leong, determined the participants' ideologies by asking them how much they agreed or disagreed with proposed legislation. Each response was given a score, with lower values attached to stances considered liberal in the United States.
One such question was: "Would you support legislation that funds a wall along the US-Mexico border to reduce illegal immigration?" Those who strongly agreed were given a high score while those who strongly disagreed got a low score. The scores earned over six questions were used to place the participants on a scale from left to right. The questions had previously been tested on 300 people who identified as liberals, conservatives, or centrists to assure their accuracy.
The test subjects then watched the previously mentioned political videos.
While the parts of the brain dedicated to collecting sensory information reacted similarly for all of the test subjects, the dorsomedial prefrontal cortex, a part of the prefrontal cortex that deals with matters of identity, narratives, and morality, of liberals and conservatives reacted at different times.
Using an fMRI, the researchers saw that neural responses differed between liberals and conservatives as the videos' messages changed. More specifically, the brain's activity was stimulated by its response to messages concerning morality, emotions, or threats. The reactions to these terms were the points of greatest divergence.
A morality based message might be something like, "What are the fundamental ethical principles that are the basis of our society? Do no harm, and be compassionate, and this federal policy violates both of these principles." A threat-based statement might resemble, "I think it's very dangerous, because what we want is cooperation amongst the cities and the federal government to ensure that we have safety in our communities, and to ensure that our citizens are protected."
Participants were asked to rate how much they agreed with each video and how likely they were to change their mind on anything after watching them. Curiously, the closer the subject's brain activity was to that of the "average" liberal or conservative of the study, the more likely they were to report that a video supporting those policies could make them change their mind.
Dr. Leong summarized the findings by saying:
"Our study suggests that there is a neural basis to partisan biases, and some language especially drives polarization. In particular, the greatest differences in neural activity across ideology occurred when people heard messages that highlight threat, morality and emotions."
This study suggests that partisanship impacts how our brains process specific terms and that political messaging relying on threat-based or ethics-based language cause partisans to interpret the message in very different ways. This processing also means that people with similar brains to other partisans are likely to be convinced by similar messages.
The location of the differences in brain function, in the later, higher-level processing department of the brain rather than in the earlier, sensory detecting department, implies that polarization does not affect sensory processing. Additionally, the results do not imply that these effects are hardwired in our brains.
How does it interact with what we already know?
These findings can be added to the list of studies that show that our political alignments might have something to do with how our brains process information. Non-partisans, often suggested to not be a real group of people, have measurably different brain activity than partisans. Brain scans show Democrats and Republicans used different parts of their brains when playing a gambling game.
Dr. Leong hopes to use this information to build better models of how the brain processes political information. Perhaps someday, these models can help us understand how to talk to each other without using these trigger words.
Politics is becoming increasingly polarized in several countries all around the world. The causes for it are still up for debate, and ways to help narrow the gaps between people are still being investigated. An increasing number of studies suggest that some of it comes down to how our brains function.
While the idea of polarization being tied to how our brains work probably won't come as a comfort to most people, the ability to identify precisely what is happening when people have polarized reactions is a step forward, as it offers a chance to understand what the other side is doing when we disagree. Perhaps someday soon, this will translate to better ways to reach across the aisle and more productive conversations informed by neuroscience.
- How to get smarter about the partisan press - Big Think ›
- Non-partisan brains differ from those of partisans - Big Think ›
The COVID-19 pandemic is making health disparities in the United States crystal clear. It is a clarion call for health care systems to double their efforts in vulnerable communities.
- The COVID-19 pandemic has exacerbated America's health disparities, widening the divide between the haves and have nots.
- Studies show disparities in wealth, race, and online access have disproportionately harmed underserved U.S. communities during the pandemic.
- To begin curing this social aliment, health systems like Northwell Health are establishing relationships of trust in these communities so that the post-COVID world looks different than the pre-COVID one.
COVID-19 deepens U.S. health disparities<p>Communities on the pernicious side of America's health disparities have their unique histories, environments, and social structures. They are spread across the United States, but they all have one thing in common.</p><p>"There is one common divide in American communities, and that is poverty," said <a href="https://www.northwell.edu/about/leadership/debbie-salas-lopez" target="_blank">Debbie Salas-Lopez, MD, MPH</a>, senior vice president of community and population health at Northwell Health. "That is the undercurrent that manifests poor health, poor health outcomes, or poor health prognoses for future wellbeing."</p><p>Social determinants have far-reaching effects on health, and poor communities have unfavorable social determinants. To pick one of many examples, <a href="https://www.npr.org/2020/09/27/913612554/a-crisis-within-a-crisis-food-insecurity-and-covid-19" target="_blank" rel="noopener noreferrer">food insecurity</a> reduces access to quality food, leading to poor health and communal endemics of chronic medical conditions. The U.S. Centers for Disease Control and Prevention has identified some of these conditions, such as obesity and Type 2 diabetes, as increasing the risk of developing a severe case of coronavirus.</p><p>The pandemic didn't create poverty or food insecurity, but it exacerbated both, and the results have been catastrophic. A study published this summer in the <em><a href="https://link.springer.com/article/10.1007/s11606-020-05971-3" target="_blank">Journal of General Internal Medicine</a></em> suggested that "social factors such as income inequality may explain why some parts of the USA are hit harder by the COVID-19 pandemic than others."</p><p>That's not to say better-off families in the U.S. weren't harmed. A <a href="https://voxeu.org/article/poverty-inequality-and-covid-19-us" target="_blank" rel="noopener noreferrer">paper from the Centre for Economic Policy Research</a> noted that families in counties with a higher median income experienced adjustment costs associated with the pandemic—for example, lowering income-earning interactions to align with social distancing policies. However, the paper found that the costs of social distancing were much greater for poorer families, who cannot easily alter their living circumstances, which often include more individuals living in one home and a reliance on mass transit to reach work and grocery stores. They are also disproportionately represented in essential jobs, such as retail, transportation, and health care, where maintaining physical distance can be all but impossible.</p><p>The paper also cited a positive correlation between higher income inequality and higher rates of coronavirus infection. "Our interpretation is that poorer people are less able to protect themselves, which leads them to different choices—they face a steeper trade-off between their health and their economic welfare in the context of the threats posed by COVID-19," the authors wrote.</p><p>"There are so many pandemics that this pandemic has exacerbated," Dr. Salas-Lopez noted.</p><p>One example is the health-wealth gap. The mental stressors of maintaining a low socioeconomic status, especially in the face of extreme affluence, can have a physically degrading impact on health. <a href="https://www.scientificamerican.com/index.cfm/_api/render/file/?method=inline&fileID=123ECD96-EF81-46F6-983D2AE9A45FA354" target="_blank" rel="noopener noreferrer">Writing on this gap</a>, Robert Sapolsky, professor of biology and neurology at Stanford University, notes that socioeconomic stressors can increase blood pressure, reduce insulin response, increase chronic inflammation, and impair the prefrontal cortex and other brain functions through anxiety, depression, and cognitive load. </p><p>"Thus, from the macro level of entire body systems to the micro level of individual chromosomes, poverty finds a way to produce wear and tear," Sapolsky writes. "It is outrageous that if children are born into the wrong family, they will be predisposed toward poor health by the time they start to learn the alphabet."</p>Research on the economic and mental health fallout of COVID-19 is showing two things: That unemployment is hitting <a href="https://www.pewsocialtrends.org/2020/09/24/economic-fallout-from-covid-19-continues-to-hit-lower-income-americans-the-hardest/" target="_blank" rel="noopener noreferrer">low-income and young Americans</a> most during the pandemic, potentially widening the health-wealth gap further; and that the pandemic not only exacerbates mental health stressors, but is doing so at clinically relevant levels. As <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7413844/" target="_blank" rel="noopener noreferrer">the authors of one review</a> wrote, the pandemic's effects on mental health is itself an international public health priority.
Working to close the health gap<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDc5MDk1MS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYxNTYyMzQzMn0.KSFpXH7yHYrfVPtfgcxZqAHHYzCnC2bFxwSrJqBbH4I/img.jpg?width=980" id="b40e2" class="rm-shortcode" data-rm-shortcode-id="1b9035370ab7b02a0dc00758e494412b" data-rm-shortcode-name="rebelmouse-image" />
Northwell Health coronavirus testing center at Greater Springfield Community Church.
Credit: Northwell Health<p>Novel coronavirus may spread and infect indiscriminately, but pre-existing conditions, environmental stressors, and a lack of access to care and resources increase the risk of infection. These social determinants make the pandemic more dangerous, and erode communities' and families' abilities to heal from health crises that pre-date the pandemic.</p><p>How do we eliminate these divides? Dr. Salas-Lopez says the first step is recognition. "We have to open our eyes to see the suffering around us," she said. "Northwell has not shied away from that."</p><p>"We are steadfast in improving health outcomes for our vulnerable and underrepresented communities that have suffered because of the prevalence of chronic disease, a problem that led to the disproportionately higher death rate among African-Americans and Latinos during the COVID-19 pandemic," said Michael Dowling, Northwell's president and CEO. "We are committed to using every tool at our disposal—as a provider of health care, employer, purchaser and investor—to combat disparities and ensure the <a href="https://www.northwell.edu/education-and-resources/community-engagement/center-for-equity-of-care" target="_blank" rel="noopener noreferrer">equity of care</a> that everyone deserves." </p><p>With the need recognized, Dr. Salas-Lopez calls for health care systems to travel upstream and be proactive in those hard-hit communities. This requires health care systems to play a strong role, but not a unilateral one. They must build <a href="https://www.northwell.edu/news/insights/faith-based-leaders-are-the-key-to-improving-community-health" target="_blank" rel="noopener noreferrer">partnerships with leaders in those communities</a> and utilize those to ensure relationships last beyond the current crisis. </p><p>"We must meet with community leaders and talk to them to get their perspective on what they believe the community needs are and should be for the future. Together, we can co-create a plan to measurably improve [community] health and also to be ready for whatever comes next," she said.</p><p>Northwell has built relationships with local faith-based and community organizations in underserved communities of color. Those partnerships enabled Northwell to test more than 65,000 people across the metro New York region. The health system also offered education on coronavirus and precautions to curb its spread.</p><p>These initiatives began the process of building trust—trust that Northwell has counted on to return to these communities to administer flu vaccines to prepare for what experts fear may be a difficult flu season.</p><p>While Northwell has begun building bridges across the divides of the New York area, much will still need to be done to cure U.S. health care overall. There is hope that the COVID pandemic will awaken us to the deep disparities in the US.</p><p>"COVID has changed our world. We have to seize this opportunity, this pandemic, this crisis to do better," Dr. Salas-Lopez said. "Provide better care. Provide better health. Be better partners. Be better community citizens. And treat each other with respect and dignity.</p><p>"We need to find ways to unify this country because we're all human beings. We're all created equal, and we believe that health is one of those important rights."</p>
A study by UK archaeologists finds that longbows caused horrific injuries similar to modern gunshot wounds.
- UK archaeologists discover medieval longbows caused injuries similar to modern gunshot wounds.
- The damage was caused by the arrows spinning clockwise.
- No longbows from medieval times survived until our times.
Battle of Agincourt.
The angle of entry into a cranium found during the excavation at a medieval Dominican friary in Exeter, England.
Credit: Oliver Creighton/University of Exeter
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Vegans and vegetarians often have nutrient deficiencies and lower BMI, which can increase the risk of fractures.
- The study found that vegans were 43% more likely to suffer fractures than meat eaters.
- Similar results were observed for vegetarians and fish eaters, though to a lesser extent.
- It's possible to be healthy on a vegan diet, though it takes some strategic planning to compensate for the nutrients that a plant-based diet can't easily provide.
Comparison of fracture cases by diet group
Credit: Tong et al.<p>The results showed that vegans were especially vulnerable to hip fractures, suffering 2.3 times more cases than meat-eaters. Vegetarians and pescatarians were also more likely to suffer hip fractures, though to a lesser extent.</p><p>One explanation may be that non-meat eaters consume less calcium and protein. Calcium helps the body build strong bones, particularly before age 30, after which the body begins to lose bone mineral density (though consuming enough calcium through diet or supplement can <a href="https://ods.od.nih.gov/factsheets/Calcium-Consumer/" target="_blank">help offset losses</a>). Lower bone mineral density means higher risk of fracture.</p><p>Protein seems to help the body absorb calcium, <a href="https://www.bonejoint.net/blog/did-you-know-that-certain-foods-block-calcium-absorption/#:~:text=Historically%2C%20nutritionists%20have%20warned%20that,may%20increase%20intestinal%20calcium%20absorption." target="_blank" rel="noopener noreferrer">when consumed in normal levels</a>. The recent study, along with past research, shows that people who don't eat meat tend to have lower levels of both protein and calcium. When the researchers accounted for non-meat eaters who supplemented their diets with calcium and protein, fracture risk decreased, but still remained significant.</p>
Credit: Pixabay<p>Another explanation is body mass index (BMI). Non-meat eaters tend to have a lower BMI, which is associated with higher fracture risk, particularly hip fractures. In the new study, vegans with a low BMI were especially likely to suffer hip fractures. That might be because having more body mass provides a cushioning effect when people fall.</p><p>Still, the study has some limitations. For one, White European women were overrepresented in the sample. The researchers also didn't collect precise data on the type of calcium or protein supplementation, diet quality or causes of fractures.</p><p>Another complicating factor: Producers of vegan products, such as plant-based milk, are increasingly fortifying foods with nutrients like calcium and protein, so modern vegans are potentially at lower risk of deficiency.</p><p>The researchers wrote that their findings "suggest that bone health in vegans requires further research."</p>