Placebo Effects
Demand Characteristics
Participant�s expectations about experiments, which influence the
dependent measure independently of the actual effect of manipulation.
<>Giving the same instruction to participants in control and in
experiment conditions.
Aspect of the research that allows participants to guess the research
hypothesis. <> Cover stories, Unrelated-experiments technique,
Non reactive measures.
Experimenter Bias
Experimenters influence on the dependent measures when they know
the research hypotheses and which condition the participants they
are running are in. <> Na�ve Experimenters and Blind Experimenters
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