Lie detection has always fringed somewhere between science and outright hooha. Regardless of opinion, where the theories begin to generate reproducible outcomes is quite interesting. Dr. Matsumoto demonstrates how the brain is a bit slower than the initial response mechanisms. You put on a look of disdain while nodding "yes" to a question, then your conscious mind says "Oh wait, I meant to lie here", forcing you to catch up with a more appropriate expression. These brief lapses of disguise are known as microexpressions.
Learning to spot these sudden shifts in facial expressions has been catching on as a new public security trend, and is now even taught to airport personnel. More on this in future posts.
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