
Here is a long, interesting article from The New Yorker on the use of functional MRI (fMRI) technology to detect lies. The article does a great job of laying out the context, including a discussion of polygraphs and other brain scanning techniques. The conclusion is that the hype surrounding using brain scans to detect lying may be unfounded because the results have been based on limited laboratory studies and the accuracy rates have been low (i.e., 10% error rates). The article also contains a good description about why it is so hard for people to detect lying, and the appeal of having a machine do it for us.
A Reporter at Large: Duped: Reporting & Essays: The New Yorker
Functional MRI is not the first digital-age breakthrough that was supposed to supersede the polygraph. First, there was “brain fingerprinting,” which is based on the idea that the brain releases a recognizable electric signal when processing a memory. The technique used EEG sensors to try to determine whether a suspect retained memories related to a crime—an image of, say, a murder weapon. In 2001, Time named Lawrence Farwell, the developer of brain fingerprinting, one of a hundred innovators who “may be the Picassos or the Einsteins of the 21st century.” But researchers have since noted a big drawback: it’s impossible to distinguish between brain signals produced by actual memories and those produced by imagined memories—as in a made-up alibi.
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