Clever Hans was a horse that seemed to be able to perform arithmetic and solve puzzles. However, after a formal 1907 investigation, it was shown that Hans was actually picking up on and responding to subtle audience cues rather than solving problems.
Commentary
The Clever Hans Effect is important because it exposes how some of our involuntary reactions influence or cue others. This is why there are occasionally problems with police lineups or interrogation of children. It is also why use of double-blind experiments is encouraged.
See Also
- Interrogation Of Children at Institute for Psychological Therapies for a lengthy discussion on the subject.
- Observer-expectancy effect at Wikipedia for the general form of this issue.
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