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The observer expectancy effect in psychology refers to the finding that the presence of an observer influences the behavior of those being observed. In a research setting, the observer effect may be called the experimenter expectancy effect.
In research methods courses, psychology students learn to guard against unintentionally influencing the participants in a study.
A correction for expectancy effects is double-blind research, which means the participants and those researchers carrying out the study do not know which group of people are in a control group or experimental group.
Geoffrey W. Sutton, PhD is Emeritus Professor of Psychology. He retired from a clinical practice and was credentialed in clinical neuropsychology and psychopharmacology. His website is www.suttong.com
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