在2009年热播的美剧《别对我撒谎》（Lie to me）中，微表情专家卡尔·莱特曼无须测谎仪，无须确凿证据，甚至无须声音，多数情况下只凭细微的表情变化便可判断的一个人说谎与否。小编当年追剧时，也苦心钻研了卡尔的“读心术”。
Out of 2,000 negotiations videotaped by Gerard I. Nierenberg and Henry H. Calero, the authors of How to Read a Person Like a Book, there wasn't a single settlement when one of the negotiators had their legs crossed.
Psychologically, crossed legs signal that a person is mentally, emotionally, and physically closed off, which may mean they're less likely to budge in a negotiation.
When someone swears to tell the truth in a court of law, they put one hand on a religious text and raise their other hand into the air, palm facing whoever they're speaking to.
That's because an open palm has been associated with "truth, honesty, allegiance, and submission" throughout Western history.
If someone's trying to look happy but really isn't, you won't see the wrinkles.
More recently, a study from Northeastern University researchers found that people could do a pretty good job of faking a Duchenne smile, even when they weren't feeling especially happy.
It seems safe to say that if the crinkles aren't there, the person's probably not genuinely happy. But just because the crinkles are there doesn't necessarily mean they're elated.
In the same way that real smiles shape the wrinkles around your eyes, worry, surprise, or fear can cause people to raise their eyebrows in discomfort.
When two people are getting along, their postures and movements mirror each other's. When your best friend crosses her legs, you will, too. If you're on a date that's going well, you'll both be making the same hand gestures.
This is because we mirror each other when we're feeling a connection, says positive psychologist Barbara Fredrickson.
In an attempt to avoid looking shifty-eyed, some liars will purposefully hold their gaze a touch too long, so that it's slightly uncomfortable, according to behavioral analyst and body language expert Lillian Glass.
They may also stand very still and not blink.
Attraction isn't communicated through one signal but a sequence.
Neuropsychologist Marsha Lucas suggests one to watch for: "After making eye contact, she looks down a bit, gathers or otherwise preens her hair, and then looks up at you while her chin is tipped."
Some of the most common manifestations of our anxiety? Touching your face and rubbing the skin on your hands. Both can be soothing behaviors when you're feeling uncomfortable.
If someone is receptive to your humor, they're likely interested in you.
Evolutionary psychologists say that humor - and positive reception to humor - play a pivotal role in human development. They serve as a way of signaling a desire for a relationship, be it platonic or romantic.
"Your legs are the largest area of your body," University of Massachusetts professor Susan Whitbourne says, "so when they move, it's pretty hard for others not to notice."
"A shaky leg signals anxiety, irritation, or both," she says.
Psychologist Ronald E. Riggio's research suggests that there's a specific type of smile people display when they're trying to act seductive.
"They typically display positive affect - a slight smile that accompanies direct eye contact, with a slow glance away, but still holding the smile.
Psychologist Paul Ekman uses the term "reliable muscles" for the muscles in the face that you can't contract voluntarily.
If you observe a person expressing sadness both verbally and facially, but the inner corners of his eyebrows are not going up and in, he may not be experiencing sadness at all. He's unable to contract these muscles voluntarily despite his best efforts.
The vast majority of facial displays of emotion are bilateral - that is, they show up on both sides of the face equally. Next time you tell a joke, look to see if her smile is symmetrical when she laughs.
If someone's leaning back and relaxed, they probably feel powerful and in control. In fact, research has found that even people born blind raise their arms in a V shape when they win a physical competition.
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The shrug is a good example of a universal gesture that is used to show that a person doesn't know or doesn't understand what you are saying.