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Artifacts in Behavioral ResearchRobert Rosenthal and Ralph L. Rosnow's Classic Books$
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Robert Rosenthal and Ralph L. Rosnow

Print publication date: 2009

Print ISBN-13: 9780195385540

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780195385540.001.0001

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Human Subjects

Human Subjects

Chapter:
(p.411) 9 Human Subjects
Source:
Artifacts in Behavioral Research
Author(s):

Robert Rosenthal

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195385540.003.0017

The evidence presented up to this point that the expectancy of the experimenter may in part determine the results of his research has been at least somewhat equivocal. Some of the evidence has been anecdotal. Some has required the untenable assumption that the expectancy of the experimenter, and not some correlated variable, had led to the effects observed. The most clear-cut evidence for the effects of the experimenter's expectancy, therefore, must come from experiments in which experimenters are given different expectancies. Of the studies examined, that by Stanton and Baker (1942) comes closest to meeting this requirement of the experimental induction of an expectancy. That study does require, however, the assumption that experimenters will expect the subjects to answer correctly the items being presented. The same assumption is required to interpret the case of Clever Hans as an experiment in expectancy effects. This chapter describes experiments that appear to be fairly straightforward tests of the hypothesis of the effects of the experimenter's expectancy on his research results.

Keywords:   experimenter expectancy, expectancy effects, human subjects, correlated variable, Stanton and Baker, Clever Hans

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