My evidence for that is hyperempiria. I didn't wait for another historical accident to come along to redefine the subjective experience of trance, as happened in Mesmer's day, when people began to imitate the behavior of the retarded Victor Emmanuel and went to sleep instead of going into convulsions. I simply made it up! And it worked!
I presented a standard hypnotic induction to one class, and a hyperempiric induction, based on suggestions of mind expansion and increased alertness, to another class, and compared the subsequent increase in responsiveness to suggestion between the two groups. There was no statistically significant difference between them -- both inductions had worked equally well. I coined the term hyperempiria from the ancient Greek word for "experience," wrote a book about it, and that was that.