Hawthorne effect

noun Psychology.
a positive change in the performance of a group of persons taking part in an experiment or study due to their perception of being singled out for special consideration.

1960–65; after the Hawthorne Works of the Western Electric Company, Cicero, Ill., where such an effect was observed in experiments

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World English Dictionary
Hawthorne effect (ˈhɔːˌθɔːn)
iatrogenic Compare placebo effect improvement in the performance of employees, students, etc, brought about by making changes in working methods, resulting from research into means of improving performance
[from the Western Electric Company's Hawthorne works in Chicago, USA, where it was discovered during experiments in the 1920s]

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