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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 ›
What is human dignity? Here's a primer, told through 200 years of great essays, lectures, and novels.
- Human dignity means that each of our lives have an unimpeachable value simply because we are human, and therefore we are deserving of a baseline level of respect.
- That baseline requires more than the absence of violence, discrimination, and authoritarianism. It means giving individuals the freedom to pursue their own happiness and purpose.
- We look at incredible writings from the last 200 years that illustrate the push for human dignity in regards to slavery, equality, communism, free speech and education.
The inherent worth of all human beings<p>Human dignity is the inherent worth of each individual human being. Recognizing human dignity means respecting human beings' special value—value that sets us apart from other animals; value that is intrinsic and cannot be lost.</p> <p>Liberalism—the broad political philosophy that organizes society around liberty, justice, and equality—is rooted in the idea of human dignity. Liberalism assumes each of our lives, plans, and preferences have some unimpeachable value, not because of any objective evaluation or contribution to a greater good, but simply because they belong to a human being. We are human, and therefore deserving of a baseline level of respect. </p> <p>Because so many of us take human dignity for granted—just a fact of our humanness—it's usually only when someone's dignity is ignored or violated that we feel compelled to talk about it. </p> <p>But human dignity means more than the absence of violence, discrimination, and authoritarianism. It means giving individuals the freedom to pursue their own happiness and purpose—a freedom that can be hampered by restrictive social institutions or the tyranny of the majority. The liberal ideal of the good society is not just peaceful but also pluralistic: It is a society in which we respect others' right to think and live differently than we do.</p>
From the 19th century to today<p>With <a href="https://books.google.com/ngrams/graph?year_start=1800&year_end=2019&content=human+dignity&corpus=26&smoothing=3&direct_url=t1%3B%2Chuman%20dignity%3B%2Cc0" target="_blank" rel="noopener noreferrer">Google Books Ngram Viewer</a>, we can chart mentions of human dignity from 1800-2019.</p><img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDg0ODU0My9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTY1MTUwMzE4MX0.bu0D_0uQuyNLyJjfRESNhu7twkJ5nxu8pQtfa1w3hZs/img.png?width=980" id="7ef38" class="rm-shortcode" data-rm-shortcode-id="9974c7bef3812fcb36858f325889e3c6" data-rm-shortcode-name="rebelmouse-image" />
American novelist, writer, playwright, poet, essayist and civil rights activist James Baldwin at his home in Saint-Paul-de-Vence, southern France, on November 6, 1979.
Credit: Ralph Gatti/AFP via Getty Images
The future of dignity<p>Around the world, people are still working toward the full and equal recognition of human dignity. Every year, new speeches and writings help us understand what dignity is—not only what it looks like when dignity is violated but also what it looks like when dignity is honored. In his posthumous essay, Congressman Lewis wrote, "When historians pick up their pens to write the story of the 21st century, let them say that it was your generation who laid down the heavy burdens of hate at last and that peace finally triumphed over violence, aggression and war."</p> <p>The more we talk about human dignity, the better we understand it. And the sooner we can make progress toward a shared vision of peace, freedom, and mutual respect for all. </p>
With just a few strategical tweaks, the Nazis could have won one of World War II's most decisive battles.
- The Battle of Britain is widely recognized as one of the most significant battles that occurred during World War II. It marked the first major victory of the Allied forces and shifted the tide of the war.
- Historians, however, have long debated the deciding factor in the British victory and German defeat.
- A new mathematical model took into account numerous alternative tactics that the German's could have made and found that just two tweaks stood between them and victory over Britain.
Two strategic blunders<p>Now, historians and mathematicians from York St. John University have collaborated to produce <a href="http://www-users.york.ac.uk/~nm15/bootstrapBoB%20AAMS.docx" target="_blank">a statistical model (docx download)</a> capable of calculating what the likely outcomes of the Battle of Britain would have been had the circumstances been different. </p><p>Would the German war effort have fared better had they not bombed Britain at all? What if Hitler had begun his bombing campaign earlier, even by just a few weeks? What if they had focused their targets on RAF airfields for the entire course of the battle? Using a statistical technique called weighted bootstrapping, the researchers studied these and other alternatives.</p><p>"The weighted bootstrap technique allowed us to model alternative campaigns in which the Luftwaffe prolongs or contracts the different phases of the battle and varies its targets," said co-author Dr. Jaime Wood in a <a href="https://www.york.ac.uk/news-and-events/news/2020/research/mathematicians-battle-britain-what-if-scenarios/" target="_blank">statement</a>. Based on the different strategic decisions that the German forces could have made, the researchers' model enabled them to predict the likelihood that the events of a given day of fighting would or would not occur.</p><p>"The Luftwaffe would only have been able to make the necessary bases in France available to launch an air attack on Britain in June at the earliest, so our alternative campaign brings forward the air campaign by three weeks," continued Wood. "We tested the impact of this and the other counterfactuals by varying the probabilities with which we choose individual days."</p><p>Ultimately, two strategic tweaks shifted the odds significantly towards the Germans' favor. Had the German forces started their campaign earlier in the year and had they consistently targeted RAF airfields, an Allied victory would have been extremely unlikely.</p><p>Say the odds of a British victory in the real-world Battle of Britain stood at 50-50 (there's no real way of knowing what the actual odds are, so we'll just have to select an arbitrary figure). If this were the case, changing the start date of the campaign and focusing only on airfields would have reduced British chances at victory to just 10 percent. Even if a British victory stood at 98 percent, these changes would have cut them down to just 34 percent.</p>
A tool for understanding history<p>This technique, said co-author Niall Mackay, "demonstrates just how finely-balanced the outcomes of some of the biggest moments of history were. Even when we use the actual days' events of the battle, make a small change of timing or emphasis to the arrangement of those days and things might have turned out very differently."</p><p>The researchers also claimed that their technique could be applied to other uncertain historical events. "Weighted bootstrapping can provide a natural and intuitive tool for historians to investigate unrealized possibilities, informing historical controversies and debates," said Mackay.</p><p>Using this technique, researchers can evaluate other what-ifs and gain insight into how differently influential events could have turned out if only the slightest things had changed. For now, at least, we can all be thankful that Hitler underestimated Britain's grit.</p>
We’ve mapped a million previously undiscovered galaxies beyond the Milky Way. Take the virtual tour here.
See the most detailed survey of the southern sky ever carried out using radio waves.
Astronomers have mapped about a million previously undiscovered galaxies beyond the Milky Way, in the most detailed survey of the southern sky ever carried out using radio waves.
A new study shows our planet is much closer to the supermassive black hole at the galaxy's center than previously estimated.
Credit: NAOJ<p><em>Arrows on this map show position and velocity data for the 224 objects utilized to model the Milky Way Galaxy. The solid black lines point to the positions of the spiral arms of the Galaxy. Colors reflect groups of objects that are part of the same arm, while the background is a simulation image.</em></p>
Apple sold its first iPod in 2001, and six years later it introduced the iPhone, which ushered in a new era of personal technology.