Last month, Brendan Nyhan, a professor of political science at Dartmouth, published the results of a study that he and a team of pediatricians and political scientists had been working on for three years. They had followed a group of almost two thousand parents, all of whom had at least one child under the age of seventeen, to test a simple relationship: Could various pro-vaccination campaigns change parental attitudes toward vaccines? Each household received one of four messages: a leaflet from the Centers for Disease Control and Prevention stating that there had been no evidence linking the measles, mumps, and rubella (M.M.R.) vaccine and autism; a leaflet from the Vaccine Information Statement on the dangers of the diseases that the M.M.R. vaccine prevents; photographs of children who had suffered from the diseases; and a dramatic story from a Centers for Disease Control and Prevention about an infant who almost died of measles. A control group did not receive any information at all. The goal was to test whether facts, science, emotions, or stories could make people change their minds.


The result was dramatic: a whole lot of nothing. None of the interventions worked. The first leaflet—focussed on a lack of evidence connecting vaccines and autism—seemed to reduce misperceptions about the link, but it did nothing to affect intentions to vaccinate. It even decreased intent among parents who held the most negative attitudes toward vaccines, a phenomenon known as the backfire effect. The other two interventions fared even worse: the images of sick children increased the belief that vaccines cause autism, while the dramatic narrative somehow managed to increase beliefs about the dangers of vaccines. “It’s depressing,” Nyhan said. “We were definitely depressed,” he repeated, after a pause.

Nyhan’s interest in false beliefs dates back to early 2000, when he was a senior at Swarthmore. It was the middle of a messy Presidential campaign, and he was studying the intricacies of political science. “The 2000 campaign was something of a fact-free zone,” he said. Along with two classmates, Nyhan decided to try to create a forum dedicated to debunking political lies. The result was Spinsanity, a fact-checking site that presaged venues like PolitiFact and the Annenberg Policy Center’s factcheck.org. For four years, the trio plugged along. Their work was popular—it was syndicated by Salon and the Philadelphia Inquirer, and it led to a best-selling book—but the errors persisted. And so Nyhan, who had already enrolled in a doctorate program in political science at Duke, left Spinsanity behind to focus on what he now sees as the more pressing issue: If factual correction is ineffective, how can you make people change their misperceptions? The 2014 vaccine study was part of a series of experiments designed to answer the question.

Until recently, attempts to correct false beliefs haven’t had much success. Stephan Lewandowsky, a psychologist at the University of Bristol whose research into misinformationbegan around the same time as Nyhan’s, conducted a review of misperception literature through 2012. He found much speculation, but, apart from his own work and the studies that Nyhan was conducting, there was little empirical research. In the past few years, Nyhan has tried to address this gap by using real-life scenarios and news in his studies: the controversy surrounding weapons of mass destruction in Iraq, the questioning of Obama’s birth certificate, and anti-G.M.O. activism. Traditional work in this area has focussed on fictional stories told in laboratory settings, but Nyhan believes that looking at real debates is the best way to learn how persistently incorrect views of the world can be corrected.

One thing he learned early on is that not all errors are created equal. Not all false information goes on to become a false belief—that is, a more lasting state of incorrect knowledge—and not all false beliefs are difficult to correct. Take astronomy. If someone asked you to explain the relationship between the Earth and the sun, you might say something wrong: perhaps that the sun rotates around the Earth, rising in the east and setting in the west. A friend who understands astronomy may correct you. It’s no big deal; you simply change your belief.

But imagine living in the time of Galileo, when understandings of the Earth-sun relationship were completely different, and when that view was tied closely to ideas of the nature of the world, the self, and religion. What would happen if Galileo tried to correct your belief? The process isn’t nearly as simple. The crucial difference between then and now, of course, is the importance of the misperception. When there’s no immediate threat to our understanding of the world, we change our beliefs. It’s when that change contradicts something we’ve long held as important that problems occur.

In those scenarios, attempts at correction can indeed be tricky. In a study from 2013, Kelly Garrett and Brian Weeks looked to see if political misinformation—specifically, details about who is and is not allowed to access your electronic health records—that was corrected immediately would be any less resilient than information that was allowed to go uncontested for a while. At first, it appeared as though the correction did cause some people to change their false beliefs. But, when the researchers took a closer look, they found that the only people who had changed their views were those who were ideologically predisposed to disbelieve the fact in question. If someone held a contrary attitude, the correction not only didn’t work—it made the subject more distrustful of the source. A climate-change study from 2012 found a similar effect. Strong partisanship affected how a story about climate change was processed, even if the story was apolitical in nature, such as an article about possible health ramifications from a disease like the West Nile Virus, a potential side effect of change. If information doesn’t square with someone’s prior beliefs, he discards the beliefs if they’re weak and discards the information if the beliefs are strong.

Even when we think we’ve properly corrected a false belief, the original exposure often continues to influence our memory and thoughts. In a series of studies, Lewandowsky and his colleagues at the University of Western Australia asked university students to read the report of a liquor robbery that had ostensibly taken place in Australia’s Northern Territory. Everyone read the same report, but in some cases racial information about the perpetrators was included and in others it wasn’t. In one scenario, the students were led to believe that the suspects were Caucasian, and in another that they were Aboriginal. At the end of the report, the racial information either was or wasn’t retracted. Participants were then asked to take part in an unrelated computer task for half an hour. After that, they were asked a number of factual questions (“What sort of car was found abandoned?”) and inference questions (“Who do you think the attackers were?”). After the students answered all of the questions, they were given a scale to assess their racial attitudes toward Aboriginals.

Everyone’s memory worked correctly: the students could all recall the details of the crime and could report precisely what information was or wasn’t retracted. But the students who scored highest on racial prejudice continued to rely on the racial misinformation that identified the perpetrators as Aboriginals, even though they knew it had been corrected. They answered the factual questions accurately, stating that the information about race was false, and yet they still relied on race in their inference responses, saying that the attackers were likely Aboriginal or that the store owner likely had trouble understanding them because they were Aboriginal. This was, in other words, a laboratory case of the very dynamic that Nyhan identified: strongly held beliefs continued to influence judgment, despite correction attempts—even with a supposedly conscious awareness of what was happening.

In a follow-up, Lewandowsky presented a scenario that was similar to the original experiment, except now, the Aboriginal was a hero who disarmed the would-be robber. This time, it was students who had scored lowest in racial prejudice who persisted in their reliance on false information, in spite of any attempt at correction. In their subsequent recollections, they mentioned race more frequently, and incorrectly, even though they knew that piece of information had been retracted. False beliefs, it turns out, have little to do with one’s stated political affiliations and far more to do with self-identity: What kind of person am I, and what kind of person do I want to be? All ideologies are similarly affected.

It’s the realization that persistently false beliefs stem from issues closely tied to our conception of self that prompted Nyhan and his colleagues to look at less traditional methods of rectifying misinformation. Rather than correcting or augmenting facts, they decided to target people’s beliefs about themselves. In a series of studies that they’ve just submitted for publication, the Dartmouth team approached false-belief correction from a self-affirmation angle, an approach that had previously been used for fighting prejudice and low self-esteem. The theory, pioneeredby Claude Steele, suggests that, when people feel their sense of self threatened by the outside world, they are strongly motivated to correct the misperception, be it by reasoning away the inconsistency or by modifying their behavior. For example, when women are asked to state their gender before taking a math or science test, they end up performing worse than if no such statement appears, conforming their behavior to societal beliefs about female math-and-science ability. To address this so-called stereotype threat, Steele proposes an exercise in self-affirmation: either write down or say aloud positive moments from your past that reaffirm your sense of self and are related to the threat in question. Steele’s research suggests that affirmation makes people far more resilient and high performing, be it on an S.A.T., an I.Q. test, or at a book-club meeting.

Normally, self-affirmation is reserved for instances in which identity is threatened in direct ways: race, gender, age, weight, and the like. Here, Nyhan decided to apply it in an unrelated context: Could recalling a time when you felt good about yourself make you more broad-minded about highly politicized issues, like the Iraq surge or global warming? As it turns out, it would. On all issues, attitudes became more accurate with self-affirmation, and remained just as inaccurate without. That effect held even when no additional information was presented—that is, when people were simply asked the same questions twice, before and after the self-affirmation.

Still, as Nyhan is the first to admit, it’s hardly a solution that can be applied easily outside the lab. “People don’t just go around writing essays about a time they felt good about themselves,” he said. And who knows how long the effect lasts—it’s not as though we often think good thoughts and then go on to debate climate change.

But, despite its unwieldiness, the theory may still be useful. Facts and evidence, for one, may not be the answer everyone thinks they are: they simply aren’t that effective, given how selectively they are processed and interpreted. Instead, why not focus on presenting issues in a way keeps broader notions out of it—messages that are not political, not ideological, not in any way a reflection of who you are?

Take the example of the burgeoning raw-milk movement. So far, it’s a relatively fringe phenomenon, but if it spreads it threatens to undo the health benefits of more than a century of pasteurization. The C.D.C. calls raw milk “one of the world’s most dangerous food products,” noting that improperly handled raw milk is responsible for almost three times as many hospitalizations as any other food-borne illness. And yet raw-milk activists are becoming increasingly vocal—and the supposed health benefits of raw milk are gaining increased support. To prevent the idea from spreading even further, Nyhan advises, advocates of pasteurization shouldn’t dwell on the misperceptions, lest they “inadvertently draw more attention to the counterclaim.” Instead, they should create messaging that self-consciously avoids any broader issues of identity, pointing out, for example, that pasteurized milk has kept children healthy for a hundred years.

I asked Nyhan if a similar approach would work with vaccines. He wasn’t sure—for the present moment, at least. “We may be past that point with vaccines,” he told me. “For now, while the issue is already so personalized in such a public way, it’s hard to find anything that will work.” The message that could be useful for raw milk, he pointed out, cuts another way in the current vaccine narrative: the diseases are bad, but people now believe that the vaccines, unlike pasteurized milk, are dangerous. The longer the narrative remains co-opted by prominent figures with little to no actual medical expertise—the Jenny McCarthys of the world—the more difficult it becomes to find a unified, non-ideological theme. The message can’t change unless the perceived consensus among figures we see as opinion and thought leaders changes first.

And that, ultimately, is the final, big piece of the puzzle: the cross-party, cross-platform unification of the country’s élites, those we perceive as opinion leaders, can make it possible for messages to spread broadly. The campaign against smoking is one of the most successful public-interest fact-checking operations in history. But, if smoking were just for Republicans or Democrats, change would have been far more unlikely. It’s only after ideology is put to the side that a message itself can change, so that it becomes decoupled from notions of self-perception.

Vaccines, fortunately, aren’t political. “They’re not inherently linked to ideology,” Nyhan said. “And that’s good. That means we can get to a consensus.” Ignoring vaccination, after all, can make people of every political party, and every religion, just as sick.

 Source: New Yorker 

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