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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.
The experimenter, a stern man in a gray laboratory coat, explained the purpose and procedure: the experiment measured the effects of punishment on learning. One subject was the teacher, who would read a list of word pairs to the other subject, the learner: for example, blue-girl, nice-day..