How to Detect Openness
When people want to be open or honest, they will often hold one or both palms out to the other person and say something like, 'I didn't do it!', 'I'm sorry if I upset you' or 'I'm telling you the truth'. When someone begins to open up or be truthful, they will likely expose all or part of their palms to the other person. Like most body language signals, this is a completely unconscious gesture, one that gives you an 'intuitive' feeling or hunch that the other person is telling the truth.
'Trust me - I'm a doctor'
The palms are intentionally used everywhere to infer an open, honest approach
The Definitive Book of Body Language
When children are lying or concealing something, they'll often hide their palms behind the back. Similarly, a man who wants to conceal his whereabouts after a night out with the boys might hide his palms in his pockets, or in an arms-crossed position, when he tries to explain to his partner where he was. However, the hidden palms may give her an intuitive feeling that he is not telling the truth. A woman who is trying to hide something will try to avoid the subject or talk about a range of unrelated topics while doing various other activities at the same time.
When men lie their body language can be obvious. Women prefer to look busy as they lie.
Salespeople are taught to watch for a customer's exposed palms when he gives reasons or objections about why he can't buy a product, because when someone is giving valid reasons, they usually show their palms. When people are being open in explaining their reasons they use their hands and flash their palms whereas someone who isn't telling the truth is likely to give the same verbal responses but conceal their hands. Keeping their hands in their pockets is a favourite ploy of men who don't want to participate in a conversation. The palms were originally like the vocal cords of body language because they did more 'talking' than any other body part and putting them away was like keeping one's mouth shut.
Palms-in-Pockets: Prince William showing the media that he doesn't want to talk
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