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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.
Experimenter Effects. One measurement effect described was the observer effect , a measurement effect produced by the actions or mere presence of an observer. Closely related to this is the concept of an experimenter effect , an effect on subjects due to the actions or presence of an experimenter.