Great show as always, but body language isn't really something that can be summed up in 5 minutes, and it's not an exact science - there are plenty of factors to take into consideration. You shouldn't rely on only one signal. You should take into consideration the "cluster" of signals (at least 3 if possible), the situation and environment, and the person you are communicating with (their culture and upbringing, etc).

Not only is culture a huge factor in body language, but it also changes from person to person. Some people may just act a certain way normally, that would be otherwise seen as suspisious behaviour when exhibited in someone else. A baseline needs to be established for each individual. What they do when they tell the truth, and what they do when they lie. Thus you can keep an eye out for that cluster of signals for that particular person.

The eyes aren't that reliable either. Considering a lot of attention is focused on the face, that's usually the one place people try to hide their deceit. Liars may just as well look at you the whole time--trying not to look away--in an attempt to fool you into believing them (hey,, they didn't look away so they can't be lying, right?). Truth is, most people don't make eye contact constantly, they actually spend more time looking elsewhere. And they tend to face diagonally rather than squared up to each other. Being squared up to someone usually makes people uncomfortable, and could be considered a challenge/threat.

As mentioned before, most people are aware of eye-movement and facial expressions, so they try to disguise these things the most. In doing so they usually forget about the rest of the body. In fact, the further away from the head you get, the more likely you are to see the truth. A person may try not to cross their arms or look away when lying, but they may be crossing their legs and be leaning away from the other person, being defensive in other ways other than crossing arms.

Anyway, L.A. Noire is based on real body language, but there will obviously be problems because they are just actors. It is hard to fake these things because our body does them automatically without us thinking about it. Then there is the problem of it being simplified and exaggerated for the average gamer. Actors (or animators like myself) who study body language for a living are going to have a much easier time with the game than others.

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That was cool, would of been nice if you touched on micro expressions and some of the technical aspects of lie detection. You got pretty technical in a lot of previous videos but I guess you opted for some more live experiments in this one which was nice. A little balance between the two would of been good.

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Awesome episode! I actually liked L.A. Noire and actually haven't completed it 100% correctly! Now I feel I can beat this game easy! Thanks, Game Theory!

This is indeed a very valuable episode, but I do find one issue with pulling out the truth out of someone: How would you be able to concentrate on the subject in order spot and register these signals quick enough without making yourself seem too obvious? Sometimes the subject's expressions may be that subtle?

And if/when they do notice your intense concentration, so many More factors come into play, particularly how well calm and collected the subject gets when they feel someone is breaching their personal bubble. What you may be assuming as a lie when they look the other way, may actually be the truth, but an instilled stimulus inside them instructs them to look away when uncomfortable. For example, I can't help but giggle when someone is looking at me (guess that's why I suck at staring contests).

My only guess is that this why poker glasses come in handy to hide your gaze and thus hiding your intentions, but even that can only go so far without further self-awareness and sensory training from both you and them (which you have to guess as well if you don't know them on a personal level along with the other facts that might help out in your case).