Overview
- A peer-reviewed paper combining three studies of 6,082 U.S. adults shows that conspiracy beliefs only predict real-world actions when people are highly certain the belief is true, see it as personally important, and view it as useful for deciding what to do.
- The researchers introduced a measurable concept called perceived actionability, which means people treat a belief as a guide for decisions, and found it amplifies the effects of certainty and importance on attitudes and behavior.
- The research tested conspiracies about immigration (‘great replacement’), Covid-19 vaccines, and a so-called deep state targeting Donald Trump, and one study used a three-month follow-up to show belief qualities predict later political actions.
- The paper pooled two nationally representative samples and other large samples to strengthen causal inference and show the same psychological pattern across health, immigration, and political domains.
- Authors and funders say interventions should target belief qualities—reducing certainty, lowering personal importance, or limiting perceived actionability—because correcting factual errors alone will not reliably stop harmful behavior.