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Although the technology is still in the early phases of development, it paves the way for applications that until now have only been the stuff of science fiction, such as reading minds for interrogation purposes, eavesdropping on dreams as people snooze... And researchers at the University of Sheffield in England believe that fMRI is more useful than polygraphs, which have been shown to have false positives and negatives, in determining whether someone is lying. (more)