In social psychological experiments, an individual who secretly works for the experimenters is called a(n):

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A confederate is an individual who secretly works for the experimenters, often posing as a participant, to help manipulate the independent variable and/or observe the effects on other participants. They may also provide false information or cues to participants to elicit particular responses. "Stooge" may also be used in a similar context, but "confederate" is the more commonly used term in social psychology research.

In Social Psychological Experiments, an Individual Who Secretly Works for the Experimenters