Unless Pinocchio is the subject, fabrications cannot be observed. So, prospective employers, cops and intelligence officers rely on the polygraph, or lie detector test, an imperfect measure of activity in the body associated with a lie.
Now scientists are using new resonance tools to look into the brain for the origins of deception. Some of these experiments in brain imaging are detailed in the new issue of Scientific American Mind. John Rennie, editor-in-chief of Scientific American, joins us with more.
(Photo courtesy Josh Bancroft)