Judging Honesty by Words, Not Fidgets
by BENEDICT CAREY, Published: May 11, 2009 in The New York Times
In several studies, Dr. Colwell and Dr. Hiscock-Anisman have reported one consistent difference: People telling the truth tend to add 20 to 30 percent more external detail than do those who are lying. “This is how memory works, by association,” Dr. Hiscock-Anisman said. “If you’re telling the truth, this mental reinstatement of contexts triggers more and more external details.”
Not so if you’ve got a concocted story and you’re sticking to it. “It’s the difference between a tree in full flower in the summer and a barren stick in winter,” said Dr. Charles Morgan, a psychiatrist at the National Center for Post-Traumatic Stress Disorder, who has tested it for trauma claims and among special-operations soldiers…
This approach, as promising as it is, has limitations. It applies only to a person talking about what happened during a specific time — not to individual facts, like, “Did you see a red suitcase on the floor?” It may be poorly suited, too, for someone who has been traumatized and is not interested in talking, Dr. Morgan said. And it is not likely to flag the person who changes one small but crucial detail in a story — “Sure, I was there, I threw some punches, but I know nothing about no knife” — or, for that matter, the expert or pathological liar.
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