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Prevalence-induced concept change in human judgment – PubMed

Prevalence-induced concept change in human judgment

David E Levari¹, Daniel T Gilbert², Timothy D Wilson³, Beau Sievers⁴, David M Amodio⁵, Thalia Wheatley⁴Affiliations expand

PMID: 29954981
DOI: 10.1126/science.aap8731

Abstract

Why do some social problems seem so intractable? In a series of experiments, we show that people often respond to decreases in the prevalence of a stimulus by expanding their concept of it. When blue dots became rare, participants began to see purple dots as blue; when threatening faces became rare, participants began to see neutral faces as threatening; and when unethical requests became rare, participants began to see innocuous requests as unethical. This “prevalence-induced concept change” occurred even when participants were forewarned about it and even when they were instructed and paid to resist it. Social problems may seem intractable in part because reductions in their prevalence lead people to see more of them.