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How to detect a liear
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Perhaps the most dangerous misapprehension that can flow from new findings in brain science is reflected in the CNN and PBS headlines: the notion that lying is your brain's fault or that the brain keeps lying. The idea, it seems, is that lying is something that happens in and by the brain, much as a dysrhythmia happens in the heart or strangulation happens in the bowel.
In reality, of course, lying is not the fault of the brain but the person to whom the brain belongs. When someone tells a lie, he or she is not merely incorrect but deceptive. People who lie are deliberately distorting the truth and misleading someone in hopes of gain, placing their purposes above the understanding and trust of the person to whom they lie.
Even in the era of functional neuro-imaging, there is no lie detector that can tell with certainty whether subjects are telling the truth. There is no truth serum that can force them to do so. At the core of every utterance is an act of moral discernment that we cannot entirely account for except to say that it reflects the character of the person who does it.
Lying is not a matter of physical law, but of moral injunction. It is less about chemistry than character. It reflects not merely what we regard as expedient in the moment but who we are at our core. Ironically, while it is less momentous to act well than to be good, we are in the end little more than the sum of all the moral compromises we have made or refused to make.
This is why we abhor the deceptive conduct of narcissists, crooks and politicians, and why we esteem so highly the characters of people who manage to tell the truth even when it is especially inconvenient to do so. Such acts are morally blameworthy or exemplary precisely because we recognize them as the products of human choice, not physical necessity.
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