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(psychol) the influence of an experimenter's expectations on his results. experimenter effect in Medicine. experimenter effect n. The influence of the experimenter's behavior, personality traits, or expectancies on the results of his or her own research.
Observer effect (physics) For other uses, see Observer effect. In physics, the term observer effect refers to changes that the act of observation will make on a phenomenon being observed. This is often the result of instruments that, by necessity, alter the state of what they measure in some manner.