___Fish said, " I think some one (possibly Turtle) in another thread that it is much more difficult to hypnotize someone that is skeptical of that ability..." I had to check your reference to me (subliminal suggestion?) & I found it was C1ay in this thread that adduced that hypothesis. Not that I wouldn't, only that I might not remember.
___This topic may well also play into the area of visual/auditory illusions. For example the famous is it a vase or two faces in profile illusion.
___I have also seen studies on subliminal learning, ie. a tape recorder playing while you sleep. If I recall, retention was only statistically significant for the period of time just before & just entering sleep. No benefit or effect was observed for REM sleep for example.

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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter