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DocJohn said:... the view I subscribed to was this was learned behavior -- the person was reinforced early in their lives for lying (e.g., they found they could get away with stuff, rewards, etc.).

This study indicated their brain is wired a little differently from the rest of us, increasing their likelihood to lie and not feel any inhibition about doing so...

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I don't think this study invalidates your original opinion, Doc. It may indeed show that liars' brains are structured differently, but it doesn't seem to address causation. It seems entirely possible that the brain structure changes as a result of the lying behavior. They'd have to do some very long-term studies where the brain structure and beahvior of very young children are examined to see if this is case of "wiring reinforcing behavior" or the other way around.