Highlights
Over 2 billion people use social media every day, and many use it to read and discuss politics. Social media also facilitate the spread of fake news and hyper-partisan content.
Online discussions of politicized topics, including political events and issues (e.g., same-sex marriage, climate change, gun control), resemble an echo chamber. That is, posts on these topics are shared primarily by people with similar ideological preferences.
Political polarization is most likely when users employ moral/emotional language. This may reflect ideological differences between people on the left versus right or partisanship.
Online partisan criticism that derogates political opponents increases political polarization.
Liberals are somewhat more likely to share cross-ideological content on social media (i.e., information posted by people with different ideological beliefs).
Democracies assume accurate knowledge by the populace, but the human attraction to fake and untrustworthy news poses a serious problem for healthy democratic functioning. We articulate why and how identification with political parties – known as partisanship – can bias information processing in the human brain. There is extensive evidence that people engage in motivated political reasoning, but recent research suggests that partisanship can alter memory, implicit evaluation, and even perceptual judgments. We propose an identity-based model of belief for understanding the influence of partisanship on these cognitive processes. This framework helps to explain why people place party loyalty over policy, and even over truth. Finally, we discuss strategies for de-biasing information processing to help to create a shared reality across partisan divides.
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In the current paper we describe how the tribal nature of the human mind leads people to value party dogma over truth.
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In this vein, one study examined the relationship between math skills and political problem-solving [58. In the control condition, people who were strong at math were able to effectively solve an analytical problem. However, when political content was added to the same analytical problem – comparing crime data in cities that banned handguns against cities that did not – math skills no longer predicted how well people solved the problem. Instead, liberals were good at solving the problem when it proved that gun control reduced crime, and conservatives were good at solving the problem when it proved the opposite. In short, people with high numeracy skills were unable to reason analytically when the correct answer collided with their political beliefs. This is consistent with research showing that people who score high on various indicators of information processing, such as political sophistication ([59; although see [48), science literacy [60, numeracy abilities [58, and cognitive reflection [61, are the most likely to express beliefs congruent with those of their party.
Partisan identity has been shown to affect memory. People are more likely to incorrectly remember falsehoods that support their partisan identity: Democrats were more likely than Republicans to incorrectly remember G.W. Bush on vacation during the Katrina hurricane, and Republicans were more likely than Democrats to falsely remember seeing Barack Obama shaking hands with the President of Iran.
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Going one step further, there is evidence that political affiliations may even shape the way we see the world. In line with work demonstrating that social identities alter visual processing [65, a study showed that party affiliation shaped people’s perceptions after watching the video of a political protest, in other words an identity-relevant event [66. When participants thought that the video depicted liberally minded protesters (i.e., opposing military recruitment on campus), Republicans were more in favor of police intervention than Democrats, whereas the opposite emerged when participants thought the video showed a conservative protest (i.e., opposing an abortion clinic). Faced with the same visual information, people seem to have seen different things and drawn different conclusions depending on their political affiliations.
The Parties in our Heads: Misperceptions About Party Composition and Their Consequences. Douglas J. Ahler, Gaurav Sood. Aug 2017, http://www.bipartisanalliance.com/2018/01/we-tend-to-considerably-overestimate.html
The echo chamber is overstated: the moderating effect of political interest and diverse media. Elizabeth Dubois & Grant Blank. Information, Communication & Society, http://www.bipartisanalliance.com/2018/01/the-echo-chamber-is-overstated.html
Processing political misinformation: comprehending the Trump phenomenon. Briony Swire, Adam J. Berinsky, Stephan Lewandowsky, Ullrich K. H. Ecker. Royal Society Open Science, published on-line March 01 2017. DOI: 10.1098/rsos.160802, http://rsos.royalsocietypublishing.org/content/4/3/160802
Competing cues: Older adults rely on knowledge in the face of fluency. By Brashier, Nadia M.; Umanath, Sharda; Cabeza, Roberto; Marsh, Elizabeth J. Psychology and Aging, Vol 32(4), Jun 2017, 331-337. http://www.bipartisanalliance.com/2017/07/competing-cues-older-adults-rely-on.html
Stanley, M. L., Dougherty, A. M., Yang, B. W., Henne, P., & De Brigard, F. (2017). Reasons Probably Won’t Change Your Mind: The Role of Reasons in Revising Moral Decisions. Journal of Experimental Psychology: General. http://www.bipartisanalliance.com/2017/09/reasons-probably-wont-change-your-mind.html
Science Denial Across the Political Divide — Liberals and Conservatives Are Similarly Motivated to Deny Attitude-Inconsistent Science. Anthony N. Washburn, Linda J. Skitka. Social Psychological and Personality Science, 10.1177/1948550617731500. http://www.bipartisanalliance.com/2017/09/liberals-and-conservatives-are.html
Biased Policy Professionals. Sheheryar Banuri, Stefan Dercon, and Varun Gauri. World Bank Policy Research Working Paper 8113. http://www.bipartisanalliance.com/2017/08/biased-policy-professionals-world-bank.html
Dispelling the Myth: Training in Education or Neuroscience Decreases but Does Not Eliminate Beliefs in Neuromyths. Kelly Macdonald et al. Frontiers in Psychology, Aug 10 2017. http://www.bipartisanalliance.com/2017/08/training-in-education-or-neuroscience.html
Individuals with greater science literacy and education have more polarized beliefs on controversial science topics. Caitlin Drummond and Baruch Fischhoff. Proceedings of the National Academy of Sciences, vol. 114 no. 36, pp 9587–9592, doi: 10.1073/pnas.1704882114, http://www.bipartisanalliance.com/2017/09/individuals-with-greater-science.html
Expert ability can actually impair the accuracy of expert perception when judging others' performance: Adaptation and fallibility in experts' judgments of novice performers. By Larson, J. S., & Billeter, D. M. (2017). Journal of Experimental Psychology: Learning, Memory, and Cognition, 43(2), 271–288. http://www.bipartisanalliance.com/2017/06/expert-ability-can-actually-impair.html
Public Perceptions of Partisan Selective Exposure. Perryman, Mallory R. The University of Wisconsin - Madison, ProQuest Dissertations Publishing, 2017. 10607943. http://www.bipartisanalliance.com/2017/10/citizens-believe-others-especially.html
The Myth of Partisan Selective Exposure: A Portrait of the Online Political News Audience. Jacob L. Nelson, and James G. Webster. Social Media + Society, http://www.bipartisanalliance.com/2017/09/the-myth-of-partisan-selective-exposure.html
Echo Chamber? What Echo Chamber? Reviewing the Evidence. Axel Bruns. Future of Journalism 2017 Conference. http://www.bipartisanalliance.com/2017/09/echo-chamber-what-echo-chamber.html
Fake news and post-truth pronouncements in general and in early human development. Victor Grech. Early Human Development, http://www.bipartisanalliance.com/2017/09/fake-news-and-post-truth-pronouncements.html
Consumption of fake news is a consequence, not a cause of their readers’ voting preferences. Kahan, Dan M., Misinformation and Identity-Protective Cognition (October 2, 2017). Social Science Research Network, http://www.bipartisanalliance.com/2017/10/consumption-of-fake-news-is-consequence.html
Psychology of Intelligence Analysis. Richards J. Heuer, Jr. CIA, Mar 2007. https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/books-and-monographs/psychology-of-intelligence-analysis/
Curing Analytic Pathologies. Jeffrey R. Cooper. CIA, May 2007. https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/books-and-monographs/curing-analytic-pathologies-pathways-to-improved-intelligence-analysis-1/
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