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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.
Based on the most up-to-date meta-analytic data, then, it is by no means clear that experimenter effects present a visible problem for psi research. Goal-oriented psi experimenter effects are conceptually the simplest form of experimenter psi, and the model most consistent with the RNG database. The experimenter effect has long been a serious issue in the sciences, so much so that the problem has come to the attention of the popular media (Lehrer, 2010).