Are you so sure? What about Duncan Cameron? What about astral time travel?
The Doppelganger phenomena does exist. I know of 2 others besides myself that have experienced this. Could that Doppelganger just be ones self out on a little outing during an astral projection from the night before?
What we are talking about here is purely the power of belief taking you back in time, not astral projection or a persons Doppelganger..
Duncan Cameron was best known for being the original psychic in the Montauk Experiments...He could use his mind to control the time portals while he was in a trance, unfortunately there were some glitches along the way and people literally ended up "lost in time" when the time portals closed in on them...Later in the experiments the scientists discovered a way to "digitise" Camerons brain patterns, thus creating very stable and glitch free time portals...But this has nothing to do with the power of belief per se...