Scientists discover ‘shadow person’
Monday, 25 September 2006
by Erica Harrison
SYDNEY: Ever feel as though you’re being followed? As if someone is behind you, shadowing your every move? It might be your ‘shadow person’, created by unusual activity in a specific brain region, a new study shows.
The paper, published in the British journal Nature, describes the case of a 22-year-old woman with no history of psychiatric problems who was being evaluated for treatment of epilepsy. When a region of her brain called the left temporoparietal junction was electrically stimulated, the woman described encounters with a ‘shadow person’ who mimicked her bodily movements.
“Electrical stimulation repeatedly produced a feeling of the presence of another person in her extra-personal space,” said Olaf Blanke, co-author of the study conducted by a team of researchers from University Hospital in Geneva, Switzerland.
When the patient was lying down, stimulation of this brain region caused her to feel that someone was behind her. She described the person as young, of indeterminate sex, “a shadow who did not speak or move, and whose position beneath her back was identical to her own”, according to the researchers.
When the patient sat up, leaned forward and clasped her knees, she felt that the figure was also sitting, embracing her in its arms - a feeling she described as “unpleasant”.
During a language task, in which the seated patient held a card in her right hand, she described the person sitting next to her and trying to interfere with the task. “He wants to take the card … he doesn’t want me to read,” she said.