mind & bodyWikipedia1949

Vague personality descriptions feel accurate to most readers, a finding called the Barnum effect

the gist

The Barnum effect, also called the Forer effect, is the tendency to rate vague personality descriptions as highly accurate when they are presented as tailored to you. Psychologist Bertram Forer demonstrated it in 1949, calling it the fallacy of personal validation, and Paul Meehl named it the Barnum effect in 1956 after the showman P. T. Barnum. The descriptions people accept tend to be broad enough to fit almost anyone. The effect helps explain why astrology, fortune telling, aura reading and some personality tests feel convincing.

how it works

People fill in vague statements with their own experiences and remember the hits more than the misses. Because the description is general, almost everyone can find themselves in it, which produces a sense of personal accuracy.

so what

It explains why flattering or general readings feel insightful, which matters for judging personality tests and self-help claims.

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Illustrative photo · Brady-Handy Photograph Collection (Library of Congress), Public domain, via Wikimedia Commons