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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.
Examples of Experimental Research: 1  The effect of a new treatment plan on breast cancer. 2  The effect of positive reinforcement on attitude toward school. 3  The effect of teaching with a cooperative group strategy or a traditional lecture approach on studentsâ achievement.