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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. A Dictionary of Sociology. Â© A Dictionary of Sociology 1998, originally published by Oxford University Press 1998. experimenter effects A term used in psychology to highlight the ways in which an experimenter or researcher may influence the outcome of an experiment through his or her presence.