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In a study investigating how the brain generates paranormal experiences and psychotic states, researchers used strong electromagnets to alter brain function and found they could reduce the number of times healthy volunteers saw spontaneously experienced false perceptions.
The researchers altered the function of the temporal lobes with a method called transcranial magnetic stimulation or TMS while participants were asked to detect supposedly 'hidden' images in what were actually completely random dot patterns.
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http://www.mindhacks.com/blog/2007/0...ghostly_i.html
The intersection of psychology, cognitive neuroscience and reports of paranormal phenomena is pretty interesting. See also
this paper in which individuals who reported having been abducted by aliens were more prone than others to generate false memories in an experimental setting designed to produce such false memories.