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Classified or Coverup? The Effect of Redactions on Conspiracy Theory Beliefs

  • Brendan Nyhan (a1), Franklin Dickinson, Sasha Dudding, Enxhi Dylgjeri, Eric Neiley, Christopher Pullerits, Minae Seog, Andy Simpson, Heather Szilagyi and Colin Walmsley...

Conspiracy theories are prevalent among the public. Governments frequently release official documents attempting to explain events that inspire these beliefs. However, these documents are often heavily redacted, a practice that lay epistemic theory suggests might be interpreted as evidence for a conspiracy. To investigate this possibility, we tested the effect of redactions on beliefs in a well-known conspiracy theory. Results from two preregistered experiments indicate that conspiracy beliefs were higher when people were exposed to seemingly redacted documents compared to when they were exposed to unredacted documents that were otherwise identical. In addition, unredacted documents consistently lowered conspiracy beliefs relative to controls while redacted documents had reduced or null effects, suggesting that lay epistemic interpretations of the redactions undermined the effect of information in the documents. Our findings, which do not vary by conspiracy predispositions, suggest policymakers should be more transparent when releasing documents to refute misinformation.

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John A. Banas and Gregory Miller . 2013. “Inducing resistance to conspiracy theory propaganda: Testing inoculation and metainoculation strategies.” Human Communication Research 39 (2): 184207.

Michael Buhrmester , Tracy Kwang , and Samuel D. Gosling . 2011. “Amazon’s Mechanical Turk: A New Source of Inexpensive, Yet High-Quality, Data?Perspectives on Psychological Science 6 (1): 35.

John G. Bullock , Donald P. Green , and Shang E. Ha . 2010. “Yes, But What’s the Mechanism? (Don’t Expect an Easy ANswer).” Journal of Personality and Social Psychology 98 (4): 550558.

Hannah Darwin , Nick Neave , and Joni Holmes . 2011. “Belief in Conspiracy Theories. The Role of Paranormal Belief, Paranoid Ideation and Schizotypy.” Personality and Individual Differences 50 (8): 12891293.

Katherine Levine Einstein and David M. Glick . 2015. “Do I Think BLS Data are BS? The Consequences of Conspiracy Theories.” Political Behavior 37 (3): 679701.

Ted Goertzel . 1994. “Belief in Conspiracy Theories.” Political Psychology 15 (4): 731742.

Albert A. Harrison and James Moulton Thomas . 1997. “The Kennedy Assassination, Unidentified Flying Objects, and Other Conspiracies: Psychological and Organizational Factors in the Perception of “Cover-up”.” Systems Research and Behavioral Science 14 (2): 113128.

Arie W. Kruglanski 1989. Lay Epistemics and Human Knowledge: Cognitive and Motivational Bases. New York: Plenum Press.

Arie W. Kruglanski 1990. “Lay epistemic theory in social-cognitive psychology.” Psychological Inquiry 1 (3): 181197.

Arie W. Kruglanski , Mark Dechesne , Edward Orehek , and Antonio Pierro . 2009. “Three Decades of Lay Epistemics: The Why, How, and Who of Knowledge Formation.” European Review of Social Psychology 20 (1): 146191.

National Transportation Safety Board. 2000. “Aircraft Accident Report: In-flight Breakup Over The Atlantic Ocean; Trans World Airlines Flight 800; Boeing 747-131, N93119; Near East Moriches, New York; July 17, 1996.” (, downloaded May 19, 2014.

Brendan Nyhan and Jason Reifler . 2010. “When Corrections Fail: The persistence of political misperceptions.” Political Behavior 32 (2): 303330.

Brendan Nyhan and Jason Reifler . 2012. “Misinformation and Fact-checking: Research Findings from Social Science.” New America Foundation Media Policy Initiative Research Paper.

Brendan Nyhan , Jason Reifler , and Peter A. Ubel . 2013. “The hazards of correcting myths about health care reform.” Medical Care 51 (2): 127132.

Marnie O’Neill . 2014. “Could this Technology Find Missing Malaysian Flight MH370?” October 17, 2014. (, downloaded March 20, 2015.

Ray Sanchez . 2014. “Nearly 80 finds.” (May 7, 2014). (, downloaded May 19, 2014.

Adam Serwer . 2014. “Senators angry at CIA redactions to torture report.” (August 5, 2014). (, downloaded August 6, 2014.

Jennifer A. Whitson and Adam D. Galinsky . 2008. “Lacking control increases illusory pattern perception.” Science 322 (5898): 115117.

John J. Horton , David G. Rand , and Richard J. Zeckhauser . 2011. “The Online Laboratory: Conducting Experiments in a Real Labor Market.” Experimental Economics 14 (3): 399425.

Daniel Jolley and Karen M. Douglas . 2014a. “The effects of anti-vaccine conspiracy theories on vaccination intentions.” PLOS ONE 9 (2): e89177.

Daniel Jolley and Karen M. Douglas . 2014b. “The Social Consequences of Conspiracism: Exposure to Conspiracy Theories Decreases Intentions to Engage in Politics and to Reduce One's Carbon Footprint.” British Journal of Psychology 105 (1): 3556.

David Kravets . 2014. “Reading Between the Lines of Redacted NSA Documents.” Wired, (February 19, 2014). (, downloaded July 30, 2014.

Joseph E. Uscinski , Joseph Parent , and Bethany Torres . N.d. “Conspiracy Theories are for Losers.” Unpublished manuscript (, downloaded December 7, 2015.

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Journal of Experimental Political Science
  • ISSN: 2052-2630
  • EISSN: 2052-2649
  • URL: /core/journals/journal-of-experimental-political-science
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