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The observer-expectancy effect [a] is a form of reactivity in which a researcher's cognitive bias causes them to subconsciously influence the participants of an experiment. Confirmation bias can lead to the experimenter interpreting results incorrectly because of the tendency to look for information that conforms to their hypothesis, and ...
The Pygmalion effect is a psychological phenomenon in which high expectations lead to improved performance in a given area and low expectations lead to worse performance. [1] It is named after the Greek myth of Pygmalion , the sculptor who fell so much in love with the perfectly beautiful statue he created that the statue came to life.
Observer-expectancy effect, a form of reactivity in which a researcher's cognitive bias causes them to unconsciously influence the participants of an experiment Observer bias , a detection bias in research studies resulting for example from an observer's cognitive biases
Research has shown that in the presence of observer bias in outcome assessment, it is possible for treatment effect estimates to be exaggerated by between a third to two-thirds, symbolising significant implications on the validity of the findings and results of studies and procedures. [1]
Observer-expectancy effect, when a researcher expects a given result and therefore unconsciously manipulates an experiment or misinterprets data in order to find it (see also subject-expectancy effect). Selective perception, the tendency for expectations to affect perception.
Like the observer-expectancy effect, it is often a cause of "odd" results in many experiments. The subject-expectancy effect is most commonly found in medicine, where it can result in the subject experiencing the placebo effect or nocebo effect, depending on how the influence pans out.
Observer-expectancy effect; Out-group homogeneity effect; Overconfidence effect; Overjustification effect; Peltzman effect; Perruchet effect; Picture superiority effect;
Clever Hans performing in 1904. Clever Hans (German: der Kluge Hans; c. 1895 – c. 1916) was a horse that appeared to perform arithmetic and other intellectual tasks.. In 1907, psychologist Oskar Pfungst demonstrated that the horse was not actually performing these mental tasks, but was watching the reactions of his trai