41. The results of ...
 
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41. The results of carefully controlled observations of Clever Hans and his ability to solve math problems showed

 

(@aamir)
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The results of carefully controlled observations of Clever Hans and his ability to solve math problems showed

  1. he could do math.
  2. he could add, but he could not subtract.
  3. he was cued by the owner looking up or down.
  4. none of these could be determined by observation.

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3. he was cued by the owner looking up or down.


   
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