From the article:<p><pre><code>    Experimenters were blind to the stimulus
    in 82% of trials and analyses showed no 
    difference in subject responses according
    to this factor (see the electronic supplementary
    material tables SII and SIII).
</code></pre>
So, it didn&#x27;t even matter. Pretty much everyone that would be doing research of this sort is familiar with Clever Hans, so I&#x27;m sure they&#x27;d be extra careful when designing their experiment.