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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 bias occurs when the measurements obtained in a study are influenced by the experimenter's expectations regarding the outcome of the study. A researcher knows the predicted outcome of a research study and is in a position to influence the results,either intentionally or unintentionally.