A new study in the British Journal of Social Psychology explains why conspiracy beliefs sometimes remain “mental convictions” and sometimes translate into concrete actions. The work argues that it is not enough to ask what people believe; researchers must also ask how strongly they endorse those beliefs and whether they treat them as decision tools.
Across three studies with more than 6,000 U.S. participants, the team tested a behavioral pathway linking conspiracy beliefs to real-world outcomes. The results show that conspiracy endorsement has, at best, modest direct links to behavior, but stronger “belief qualities” make the same ideas far more predictive.
The critical factors were belief certainty (how sure people are that the claim is true) and personal importance (how much the belief matters to them). When these dimensions were elevated, conspiracy beliefs more strongly shaped attitudes toward specific behaviors, such as support for Covid-19 vaccination.
A third ingredient—perceived actionability—proved to be the hinge. When participants viewed their conspiracy beliefs as useful for deciding what to do, the certainty/importance effects intensified, making the beliefs more likely to guide attitudes.
Those behavior-relevant attitudes then predicted actual actions. In the vaccination study, conspiracy beliefs forecast participants’ vaccination status. In the immigration-related work, they predicted attitudes toward immigration behaviors. Together, these domains showed the same psychological logic.
One longitudinal component tracked conspiracy theories about a “deep state” undermining Donald Trump across three months. Here, the model connected belief endorsement to behaviors including seeking and sharing political information, donating to campaigns, volunteering, and attending rallies.
The authors interpret this as a motivation mechanism: belief strength and decision usefulness jointly increase the likelihood that attitudes become behavior-driving. The study therefore reframes interventions as more than factual correction.
Lead author Javier A. Granados Samayoa emphasized that people can endorse conspiracy theories to similar degrees yet differ dramatically in whether the beliefs become behavior catalysts. Senior author Dolores Albarracín argued that reducing harm requires understanding the psychological qualities that convert misinformation into motivation.
Notably, the findings may generalize beyond conspiracy theories, suggesting that other belief systems can also become behavior-shaping when held with high certainty, high importance, and perceived action value.
Subject of Research: People
Article Title: Belief strength and the attitudinal and behavioural correlates of conspiracy beliefs
News Publication Date: 31-May-2026
Web References: http://dx.doi.org/10.1111/bjso.70104
References: 10.1111/bjso.70104
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Keywords: social psychology, social attitudes, motivation, psychological science
