The Pygmalion effect, or Rosenthal effect, is the phenomenon whereby the greater a wish or thought is makes the thing the person wanted really happens. The effect is named after the Greek myth of Pygmalion, a sculptor who fell in love with a statue he had carved. A corollary of the Pygmalion effect is the golem effect, in which low expectations lead to a decrease in performance; both effects are forms of self-fulfilling prophecy
Source : wikipédia
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