the spooky experiment which conjured up a ghostly illusion in the laboratory has proved once and for all that it 's only our mind playing tricks .
the sensation was re-created by researchers using a robot to interfere with the sensory signals in the brains of blindfolded volunteers .
under normal circumstances the brain is able to form a unified self-perception , but lead researcher olaf blanke explained that when this malfunctions the brain creates a second representation of its body .