Hawthorne-effect
noun, Psychology.
1.
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.
/ˈhɔːˌθɔːn/
noun
1.
improvement in the performance of employees, students, etc, brought about by making changes in working methods, resulting from research into means of improving performance Compare iatrogenic, placebo effect
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