Thursday, March 17, 2011

How To Spot A Liar

I am big fan of Dare to Dream blog. I highly recommend following their blog even though their posts are sporadic and sparse with few posts a year. But patience does pay off; each post is enlightening and educational. Their latest on detecting liars:

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Most psychologists and other scientists agree that there is little basis for the validity of polygraph tests. Courts, including the United States Supreme Court (cf. U.S. v. Scheffer, 1998 in which Dr.'s Saxe's research on polygraph fallibility was cited), have repeatedly rejected the use of polygraph evidence because of its inherent unreliability. (American Psychological Association, 2004.)
People who show the strongest expressions were best at judging other's expressions. Successful lying takes concentration, while facial expression is controlled unconsciously. The prefrontal areas can only control so much before involuntary emotional expression breaks through. A lie is delayed .2 sec in expression and is often accompanied with incongruent emotional expression. (Goleman, 2006, pp 23-26)"


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