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Related Experiment Video

Updated: Aug 1, 2025

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses
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Moralization and extremism robustly amplify myside sharing.

Antoine Marie1, Sacha Altay2, Brent Strickland3,4

  • 1Department of Political Science, Aarhus University, Bartholins Allé 7, Aarhus 8000, Denmark.

PNAS Nexus
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

Moralization and extreme attitudes amplify sharing of partisan news, even fake news. Interventions to reduce this "myside" sharing were largely ineffective, suggesting robust bias in online information sharing.

Keywords:
extremismfake newsmoralizationpolarizationpolitical biassharingsocial media

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Area of Science:

  • Social Psychology
  • Communication Studies
  • Computational Social Science

Background:

  • Online sharing of partisan news is prevalent.
  • Understanding factors amplifying selective sharing is crucial for addressing misinformation.

Purpose of the Study:

  • To investigate if moralization and attitude extremity amplify "myside" partisan news sharing.
  • To examine interventions aimed at reducing this sharing tendency.

Main Methods:

  • Conducted 12 online experiments with 6,989 participants.
  • Examined news sharing decisions on divisive political issues.
  • Tested interventions manipulating audience, anonymity, and bias warnings.

Main Results:

  • "Myside" sharing was consistently amplified by moralization and attitude extremity.
  • Moralization's amplification effect often exceeded that of attitude extremity.
  • Interventions showed limited success in reducing "myside" sharing, which remained robust.

Conclusions:

  • Moralization and extremism strongly drive selective communication of partisan news.
  • This bias contributes to belief polarization and the spread of online misinformation.
  • Current interventions are insufficient to mitigate the robust amplification of "myside" sharing.