experimenter effect

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experimenter effect

n
(Psychology) psychol the influence of an experimenter's expectations on his results
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References in periodicals archive ?
Experimenter effects and similarity to the individual setting
As for Doyen's proposal that Bargh's team subtly prompted responses from volunteers, Bargh dismisses it: "We went out of our way to control for experimenter effects in our 1996 studies." Experimenters who dealt with volunteers knew nothing about the study's aims or materials and never saw scrambled sentences, which were handed to participants in sealed envelopes.
The importance of considering experimenter effects on outcomes in experimental studies dates back to the work of Rosenthal (1966), who documented the influence of a variety of experimenter characteristics (e.g., sex, ethnicity, attire, warmth) on study outcomes.
Such 'experimenter effects' are common within parapsychology.
A more general reservation arises from the possibility of experimenter effects. Anyone who has worked with pre-primary school children knows that the age, sex and other characteristics of an experimenter unfamiliar to the children can have a substantial effect on their willingness to cooperate.
Wrapped up in the issue of replication difficulties and methodological artefacts is a concern about experimenter effects. In summarising his contribution, French asks for a reliable demonstration of psi with a medium to large effect size that can operate in the presence of skeptics.
One topic that I think they do not treat optimally is the evaluation of experimenter effects. One strategy for evaluating experimenter effects is to do an ANOVA with each experimenter as a factor level.
Along similar lines, the next chapter in the book, authored by Edwin May, Tamas Paulinyi, and Zoltan Vassy (MPV), discusses possible experimenter effects in presentiment work.