https://en.wikipedia.org/wiki/Charles_Tart
OBE experiment
In 1968, Tart conducted an OBE experiment with a subject known as Miss Z for four nights in his sleep laboratory.[3] The subject was attached to an EEG machine and a five-digit code was placed on a shelf above her bed. She did not claim to see the number on the first three nights but on fourth gave the number correctly.[4][5]
During the experiment Tart monitored the equipment in the next room, behind an observation window, however, he admitted he had occasionally dozed during the night.[6] The psychologists Leonard Zusne and Warren Jones have written that the possibility of the subject having obtained the number through ordinary sensory means was not ruled out during the experiment. For example when light fell on the code it was reflected from the surface of a clock located on the wall above the shelf. The subject was not constantly observed and it was also suggested she may have read the number when she was being attached to the EEG machine.[4] According to the magician Milbourne Christopher "If she had held a mirror with a handle in her right hand, by tilting the mirror and looking up she could have seen a reflection of the paper on the shelf... The woman had not been searched prior to the experiment, nor had an observer been in the sleep chamber with her — precautions that should have been taken."[6]
The psychologist James Alcock criticized the experiment for inadequate controls and questioned why the subject was not visually monitored by a video camera.[7] Martin Gardner has written the experiment was not evidence for an OBE and suggested that whilst Tart was "snoring behind the window, Miss Z simply stood up in bed, without detaching the electrodes, and peeked."[8] Susan Blackmore wrote "If Miss Z had tried to climb up, the brain-wave record would have showed a pattern of interference. And that was exactly what it did show."[9]
The experiment was not repeated at the laboratory, Tart wrote this was because Miss Z moved from the area where the laboratory was located.[10]