You go out with friends to see a hypnotist at a local bar. If you wanted to sure that the people who were hypnotized were really in an altered state, you would look for evidence of

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A hidden observer is a phenomenon associated with hypnosis where a part of the hypnotized person's consciousness is aware of what's happening, suggesting an altered state of consciousness rather than mere role-playing or suggestibility.

You Go Out with Friends to See a Hypnotist at a Local