I'm curious how one would even do control for this. The whole point of this treatment is to deliver sensations. How would you pretend delivering sensations in a way that can't be easily told from actual sensations?
It might be a little much, but maybe you could numb the area? (although this might eliminate the effect...) or maybe use something like laughing gas to put the patient semi-out (you probably wouldn't want general anesthesia, since that's risky)?
