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People Are Allergic to the Facts

New research finds we trust experts who agree with our own opinions, suggesting that subjective feelings override scientific information.

A clear consensus of opinion emerges within the scientific community on an important issue, such as climate change. But the public, and its elected leaders, remains unconvinced and unreceptive to well-founded warnings.

With this phenomenon growing frustratingly familiar, researchers can be forgiven if they begin to feel like Rodney Dangerfields in lab coats. From their perspective, they don’t get no respect.

Newly published research suggests that’s not entirely true: Americans do believe and trust researchers. But we focus our attention on those experts whose ideas conform with our preconceived notions. The others tend to get discounted or ignored.

“Scientific opinion fails to quiet societal disputes on such issues (as climate change) not because members of the public are unwilling to defer to experts, but because culturally diverse persons tend to form opposing perceptions of what experts believe,” a team of scholars writes in the Journal of Risk Research. “Individuals systematically overestimate the degree of scientific support for positions they are culturally predisposed to accept.”

The research team, led by Dan Kahan of Yale Law School, studied “a broadly representative sample” of 1,500 Americans in 2009. Through a series of questions, their cultural beliefs were measured on what can be called a left-right scale (although the researchers do not use the terms “liberal” and “conservative” in their paper). Those strongly holding egalitarian and communitarian outlooks were on one end of the spectrum, while those with hierarchical and individualistic views were on the other.

Participants were then presented with a series of statements and asked whether in their view most experts concurred with them. Three of the statements represented the consensus of scientific opinion: “Global temperatures are increasing,” “Human activity is causing global warming,” and “Radioactive wastes from nuclear power can be safely disposed of in deep underground storage facilities.”

Finally, the participants were introduced to a fictional expert on one of those subjects, who either agreed or disagreed with their position. After reviewing the researcher’s credentials and reading a bit of their writing, each participant rated the degree to which they found the expert knowledgeable and trustworthy.

On the first question, participants were predisposed to believe that a majority of experts agreed with their personal point of view. Among those with an egalitarian/communitarian mindset (i.e., liberals), 78 percent reported (correctly) that there is a scientific consensus that climate change is occurring.

But among those with a hierarchical/individualistic attitude (i.e., conservatives), only 19 percent said there was a scientific consensus that climate change is real. Fifty-six percent reported the scientific community is divided on the issue, and another 25 percent insisted that most scientists agree with them that climate change is not real.

Before you start cursing close-minded conservatives, consider this: When it came to the issue of safely storing nuclear waste, the opposite effect was found (although the differences between the two groups were not as large). Thirty-seven percent of those on the right reported, correctly, that the scientific consensus supported their view. In contrast, 35 percent of those on the left inaccurately believe the scientific consensus reflects their opinion.

When it came to assessing the imaginary expert, the attitude he purportedly held “dramatically affected the responses” of the participants, Kahan and his colleagues report. If his writing sample reflected the belief the planet is at high risk from global warming, 87 percent of those on the left agreed he was trustworthy and knowledgeable, compared to 23 percent of those on the right. The numbers reversed when the expert, with the exact same credentials, stated that climate-change risks are low: 86 percent of conservatives called him knowledgeable and trustworthy, compared to 47 percent of liberals.

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