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I believe that it is Paul Ekman who is primarily responsible for suggesting that when people lie, their faces exhibit fleeting "microexpressions" that reveal their underlying beliefs. It would be a fun thing to believe, but the only evidence I've heard is "well, just look at this frame grab and you can see X." I tend to think with enough frames, you can find any expression you want.

Is there good reason to believe in "microexpressions" as lie detectors?

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See how well you do yourself: Facial Expression Test –  Oliver_C May 14 '11 at 22:32
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Cal Lightman would be out of a job otherwise. –  Trufa May 15 '11 at 3:05

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Charles Darwin - The Expression of the Emotions in Man and Animals

A man when moderately angry, or even when enraged, may command the movements of his body, but ... those muscles of the face which are least obedient to the will, will sometimes alone betray a slight and passing emotion.



David Matsumoto - Study

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Joyful smiles, dismayed frowns and other facial expressions of emotion are hardwired into our genes according to a new study.

Using thousands of photographs captured at the 2004 Olympic and Paralympic Games, Matsumoto compared the facial expressions of sighted and blind judo athletes, including individuals who were born blind.

All competitors displayed the same expressions in response to winning and losing.

"The statistical correlation between the facial expressions of sighted and blind individuals was almost perfect," said Matsumoto.

This new evidence shows that facial expressions of emotion are innate rather than learned through cultural observation.

Here is a short video of Matsumoto explaining microexpressions.



HowStuffWorks - Microexpressions

While we provide others with visual information about the way we feel through our expressions, other information "leaks" out of our faces between or during these intentional expressions. Microexpressions can be as brief as about 1/25 of a second.

Microexpressions can be much more accurate signs of a person's true feelings and intentions than the expression he or she is consciously producing.

Here is a short video of Paul Ekman showing 2 examples.



Stephen Porter - Study

New research out of Stephen Porter’s Forensic Psychology Lab at Dalhousie University determines the face will betray the deceiver’s true emotion.

The results were that no one participant was able to falsify emotions perfectly. Some emotions were harder to falsify than others: happiness is easier to fake than disgust or fear.

The researchers were able to discern rare “microexpressions,” flashes of true emotion that show briefly, from one-fifth to one-25th of a second, on the faces of participants when instructed to deceive.



Mark Frank - Lying Is Exposed By Micro-Expressions We Can't Control

... in a project for the National Science Foundation, Frank developed computer programs ... making it possible to identify automatically every facial expression.

Frank's system has proven successful in identifying suspects involved in conventional criminal and potentially criminal behavior. It is now being tested for use in identifying potential terrorists.

"Fleeting facial expressions are expressed by minute and unconscious movements of facial muscles like the frontalis, corregator and risorius," Frank says, "and these micro-movements, when provoked by underlying emotions, are almost impossible for us to control."

"I want to make it clear that one micro-expression or collection of them is not proof of anything. They have meaning only in the context of other behavioral cues, and even then are not an indictment of an individual, just very good clues."



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are actors different? because it appears that Tim Roth can act the microexpressions properly on the poster –  Louis Rhys May 15 '11 at 5:37
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They don't look "micro" to me. They are simply "expressions". :-) –  Sklivvz May 15 '11 at 7:10
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"Micro" is more about the short time frame they are displayed. And I guess for the sake of good photos Tim Roth is doing the most "expressive" versions (maybe through method acting?). I have linked to two videos where you can see microexpressions in real time. And have a look at the Facial Expression Test if you want to test your "detection" abilities. –  Oliver_C May 15 '11 at 12:47
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Those tests are idiotic. –  Django Reinhardt May 15 '11 at 16:12
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The Tim Roth pictures are a terrible reference given that they are part of an advertising campaign for the show Lie to Me which takes this idea as its very premise. As in, they have no incentive to be be informative or accurate; the pictures are designed to make you want to watch the show. –  MrHen May 16 '11 at 19:20

Any good poker player will be able to spot "tells" in other players, One of the best experts on the fields is Joe Navarro. He is a former FBI counter terrorism expert. That being said its a complex subject and whole books have been written on the subject.

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