Margaret Talbot isn't impressed by fMRI lie detectors:

One conclusion you can draw about lie detection by fMRI from this and less quirky studies is that, as Miller says, “If you sample a population in which you know that there is a ten percent chance that they are lying, then for every 9 hits (correctly identifying someone as lying), you will also get 9 false alarms (saying somebody is lying when they are not.)”

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