In one perseverance study, participants tried to distinguish between real
and fake suicide notes. In
fact, regardless of what they said, half the people were told they
were right most of the time (the “success” condition), while the
others were usually told they were wrong (the “failure”
condition). Later, the participants were debriefed. It was
explained that the feedback was false and that they had been randomly
assigned to success and failure conditions. Even though they
understood the debriefing, the “successful” people still believed
they were better at the task than those who had “failed” thought
they were.
Perseverance
affects people's reactions to scientific studies that support or
contradict their beliefs. Another experiment involved students with
contrasting attitudes, some who believed that capital punishment was
a deterrent to murder and others who rejected this claim. People in
both groups read summaries of two fictitious studies, one which
supported the deterrence hypothesis and one which didn't. You might
think reading mixed evidence would lead people to moderate their
beliefs. However, both pro- and anti-deterrence participants became
more convinced of their original beliefs—a backfire
effect. The two groups' beliefs
became more polarized.
Perseverance
studies seem to suggest that fact-checking politically biased claims
is a losing effort. Recent research suggests that more educated and well-informed people show greater perseverance, since having more
information allows them to explain away contradictory findings more
easily. The Nyhan study is in that tradition. Here is Dr. Ubel explaining the
study.
The chart below shows the results. On the left are the low knowledge
participants. Without the correction, those who liked Palin believed
the death panel myth, but the rebuttal was effective in disabusing
them of this belief. However, the high knowledge Palin supporters
believed the death panel myth more with the correction than without
it. The correction backfired.
Just a
word of caution. I was fully prepared to believe this study;
however, the more I thought about it, the more I sympathized with the
high information Palin supporters. The rebuttal to Palin's claim
read (in its entirely) as follows:
However,
non-partisan health care experts have concluded that Palin is wrong.
The bill in the House of Representatives would require Medicare to
pay for voluntary end-of-life counseling sessions, but there is no
panel in any of the health care bills in Congress that judges a
person's “level of productivity in society” to determine whether
they are “worthy” of health care.
Should
a well-informed Republican really be satisfied with this rebuttal?
If I were in their shoes, I might want to ask some additional
questions. Who are these “non-partisan experts?” The correction
addresses Palin's claim about end-of-life counseling, but what about
the Patient-Centered Outcomes Research Institute, which is charged
with evaluating the effectiveness of medical treatments, and the Medicare Independent Payment Advisory Board, which is supposed to refuse to
pay for expensive but ineffective treatments? How much indirect
control will they have over the treatment patients actually receive?
I personally hope these groups will help to eliminate wasteful
procedures, but since they haven't met yet, we don't really know.
I'm
not questioning the existence of perseverance, or that it makes
researchers' lives a lot more difficult. However, another way to
read this study is that well-informed people may require more
detailed counterarguments than these authors provided.
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