'Cold reading' is a set of techniques used by mentalists, psychics, fortune-tellers, mediums, illusionists (readers), and scam artists to imply that the reader knows much more about the person than the reader actually does.
en.wikipedia.orgBarnum effect
The effect is a specific example of the so-called "acceptance phenomenon", which describes the general tendency of humans "to accept almost any bogus personality feedback". ... For example, while reading a horoscope, people actively seek a correspondence between its contents and their perception of their personality.
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