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Barnum effect : ウィキペディア英語版
Barnum effect

The Barnum effect, also called the Forer effect, is the observation that individuals will give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically for them, but are in fact vague and general enough to apply to a wide range of people. This effect can provide a partial explanation for the widespread acceptance of some beliefs and practices, such as astrology, fortune telling, graphology, aura reading and some types of personality tests.
A related and more general phenomenon is that of subjective validation. Subjective validation occurs when two unrelated or even random events are perceived to be related because a belief, expectation, or hypothesis demands a relationship. Thus people seek a correspondence between their perception of their personality and the contents of a horoscope.
== Forer's demonstration ==
In 1948, psychologist Bertram R. Forer gave a psychology test—his Diagnostic Interest Blank—to a group of his psychology students who were told that they would each receive a brief personality vignette or sketch based on their test results. One week later Forer gave each student a purportedly individualized sketch and asked each of them to rate it on how well it applied. In reality, each student received the ''same'' sketch, consisting of the following items:
On average, the students rated its accuracy as 4.26 on a scale of 0 (very poor) to 5 (excellent). Only after the ratings were turned in was it revealed that each student had received an identical sketch assembled by Forer from a newsstand astrology book.〔 The sketch contains statements that are vague and general enough to apply to most people.
In another study examining the Forer effect, students took the MMPI personality assessment and researchers evaluated their responses. The researchers wrote accurate evaluations of the students’ personalities, but gave the students both the accurate assessment and a fake assessment using vague generalities. Students were then asked to choose which personality assessment they believe was their own, actual assessment. More than half of the students (59%) chose the fake assessment as opposed to the real one.
The Forer effect is also known as the "Barnum effect". This term was coined in 1956 by American psychologist Paul Meehl in his essay "Wanted – A Good Cookbook". He relates the vague personality descriptions used in certain "pseudo-successful" psychological tests to those given by entertainer and businessman P. T. Barnum, who was a notorious hoaxer.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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