The influence of an experimenter's behaviour, personality traits, or expectations on the outcome of an experiment. These effects can be significant when, for example, a scientist studying the action of a drug on athletic performance knows, which group is given a placebo and which group is given the drug: the effect can be nullified by conducting a double-blind study.
Expectancy effect
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n.
The influence of the experimenter's behavior, personality traits, or expectancies on the results of his or her own research.
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 | Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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