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Scientific Evidence and Belief Updating in Polarized Media Environments

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Abstract

We use a large-scale survey experiment in Italy to study how citizens update their beliefs about the effects of highly salient and politically contested policy reforms when exposed to scientific evidence. We find that while prior beliefs are often inconsistent with accurate scientific evidence, providing this evidence shifts beliefs towards accuracy. Crucially, belief updating is largely independent of the political alignment of media source conveying the information. This suggests that credible evidence can overcome partisan divides.

Suggested Citation

  • Marco Bertoni & Paolo Falco & Luigi Guiso & Tullio Jappelli & Roberto Nisticò, 2026. "Scientific Evidence and Belief Updating in Polarized Media Environments," CSEF Working Papers 776, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy.
    • Handle: RePEc:sef:csefwp:776
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    JEL classification:

    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
    • D91 - Microeconomics - - Micro-Based Behavioral Economics - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making

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