Epistemology and Politics

Brendan Nyhan, a political scientist and health policy researcher at the University of Michigan, writes:

"Studies have shown that people tend to seek out information that is consistent with their views; think of liberal fans of MSNBC and conservative devotees of Fox News. Liberals and conservatives also tend to process the information that they receive with a bias toward their pre-existing opinions, accepting claims that are consistent with their point of view and rejecting those that are not. As a result, information that contradicts their prior attitudes or beliefs is often disregarded, especially if those beliefs are strongly held.

Unfortunately, these tendencies frequently undermine well-intentioned efforts to counter myths and misperceptions. Jason Reifler, a political scientist at Georgia State, and I conducted a series of experiments in which participants read mock news articles with misleading statements by a politician. Some were randomly assigned a version of the article that also contained information correcting the misleading statement.

Our results indicate that this sort of journalistic fact-checking often fails to reduce misperceptions among ideological or partisan voters. In some cases, we found that corrections can even make misperceptions worse. For example, in one experiment we found that the proportion of conservatives who believed that President George W. Bush’s tax cuts actually increased federal revenue grew from 36 percent to 67 percent when they were provided with evidence against this claim. People seem to argue so vehemently against the corrective information that they end up strengthening the misperception in their own minds.

The debate over health care reform, which was marred by false and misleading claims about the plan’s contents, provides a case study in how difficult it is to correct widely held misperceptions."

The rest is here.