Lie and your brain will send more blood to the ventrolateral area of your prefrontal cortex. fMRI scans can tell when this happens by measuring blood-oxygen levels in the brain. Soon such brain-scanning lie detectors may be used in courts.
fMRI scans aren't exactly perfect when it comes to showing when someone is lying - in some small studies the accuracy has ranged from 76 per cent to over 90 per cent - but a Brooklyn attorney, David Levin, is fighting to use them in a case anyway. Levin thinks that the scans will be sufficient to determine whether a woman's employer really was treating her unfairly after she complained about sexual harassment.
If used to break the "he-said/she-said stalemate" of this case, fMRI scans would most likely wind up being used in other cases as well, so this case could be setting a rather significant precedent. [Wired]
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