Inducing a doppelgänger: that was the goal of a recent medical experiment, somehow not run by mad scientists.
Actually, Anil Ananthaswamy explores several different ways humans can really see their own doubles. This includes by accident, which occurred when a "young man had stopped taking some of his anticonvulsant medication" and "drank copious amounts of beer and stayed in bed." The author also explains the functions of autoscopy and heautoscopy.
Olaf Blanke's experiments are the truly Infocultish material:
The subject was lying down, and a robotic arm stroked the subject’s back. Meanwhile, the subject viewed through a head-mounted display a video of a person being stroked on the back. The robotic arm’s stroking was either synchronous or asynchronous with stroking of the virtual person seen on the display. Again, in some subjects, their sense of location and sense of body ownership were shaken up. One of the most striking outcomes was when a subject reported looking at their own body from above, even though the subject was lying prone, face-up, in the scanner.
Ananthaswamy's book, The Man Who Wasn't There, sounds very Infocultish.