Pluralistic Ignorance and Conviction Gaps in Beliefs About Extraterrestrial Intelligence

To the point

Omer Eldadi, Gershon Tenenbaum, and Abraham Loeb surveyed 6,114 educated adults about belief in extraterrestrial intelligent life and how people react to expert consensus, finding that 95.01% personally believe it exists and 62.59% are definite, that social-circle beliefs lag by 46.07 percentage points despite near-universal personal conviction, that people overestimate how many experts share the belief (67.63% vs 58.20% reality) but underestimate how strongly experts hold definitive beliefs (only 21.10% perceived as definitive), and that when actual consensus was revealed in a manipulation (N=5,106; 83.51% passed) personal belief changed negligibly (d = -0.11) and social belief changed only a little (d = 0.14), showing misperceptions occur on both prevalence and intensity and even scientifically engaged audiences resist updating beliefs from expert consensus.

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arxiv.org

Surveys on the Existence of Extraterrestrial Intelligent Life and Effects of Revealing Expert Consensus

Vickers et al. (2025) established that 58.20% of astrobiology experts believe intelligent extraterrestrial life likely exists, providing the first empirical baseline for public comparison. We surveyed 6,114 highly educated and scientifically engaged individuals (77.60% bachelors degree+; 67.99% high-to-very-high scientific engagement) to assess their beliefs about extraterrestrial intelligent life existence: (1) personal beliefs, (2) perceived social circle beliefs, (3) perceived expert beliefs, and (4) responses to expert consensus revelation. Results showed 95.01% believed extraterrestrial intelligent life exists, with 62.59% holding definitive rather than probable convictions. Participants exhibited massive pluralistic ignorance, a cosmic closet, underestimating social circle beliefs by 46.07 percentage points despite near-universal personal conviction. Participants also exhibited a novel conviction intensity gap: while overestimating expert belief prevalence (67.63% vs. 58.20% actual), they underestimated expert conviction strength, perceiving only 21.10% as holding definitive beliefs. Experimental revelation of actual consensus (N = 5,106; 83.51% passed manipulation check) produced negligible personal belief change (d = -0.11) and small social belief change (d = 0.14). These findings demonstrate that consensus misperception operates along two dimensions, prevalence and intensity, and that even scientifically engaged audiences resist belief revision via expert consensus information.