But a sample size of one is worthless, especially when the person running the experiment is high :)<p>On a more serious note, I have no idea how you&#x27;d actually test this. How would you prove or disprove that someone experimenting with hallucinogens is actually communicating with something else?<p>The only thing I can think of is having two people under the influence being able to communicate with each other, with absolutely no other way of doing so. Subjects A and B have never met, and don&#x27;t have any way of passing messages during their experience. Subject A is told to pass some randomly generated string to subject B, either directly or via some alien intermediary. If Subject B can guess Subject A&#x27;s string, then that might be evidence of <i>something</i> interesting and objectively external happening.