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Observer effect
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== General experimental biases == * [[Hawthorne effect]], a form of reactivity in which subjects modify an aspect of their behavior, in response to their knowing that they are being studied * [[Observer-expectancy effect]], a form of reactivity in which a researcher's cognitive bias causes them to unconsciously influence the participants of an experiment * [[Observer bias]], a detection bias in research studies resulting for example from an observer's cognitive biases * [[Observer's paradox]], a situation in which the phenomenon being observed is unwittingly influenced by the presence of the observer.
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