Question

What is the Pygmalion effect?

Answer 1

The Pygmalion effect, or Rosenthal effect, is the phenomenon whereby others' expectations of a target person affect the target person's performance. ... 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
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Answer 2

The Pygmalion effect, also know as the Rosenthal effect, is the phenomenon whereby higher expectations lead to an increase in performance, named after the Ovid tale of a sculptor who falls in love with one of his statues.

Robert Rosenthal defined the Pygmalion effect as “the phenomenon whereby one person’s expectation for another person’s behavior comes to serve as a self-fulfilling prophecy” (American Psychologist,Nov. 2003, p. 839).