RESEARCHERS believe they have found a key insight into deja vu, the eerie sensation of seeing something that has already been experienced, the New Scientist magazine reports. Experiments suggest that deja vu can be triggered independently, without a real memory to prompt it, the British weekly magazine reports in its latest issue. Recognising a familiar object or scene is believed to unleash two processes in the brain. First, the mind searches through its memory archive to see if the contents of that scene have been observed before. If so, a separate part of the brain then identifies the scene or...