Did training in this and it's a fascinating subject.
Communication is made up of only 7% of actual words. The rest is tone, pitch, phrasing, inflection and body language. That is why texts are so open to misinterpretation. Emojis can help but, even so, communication by text can go badly wrong because all you have is a few words.
I never heard my mother say a bad word against anyone but I always knew when she didn't warm to someone. There were a couple of facial tics that gave her away. She was always astonished when I asked her why she didn't like someone and she always wondered how I'd guessed. I just used to say it's written all over your face. ?.
That's why professional card players have to be so careful with their facial expressions.,,,,,,,the slightest tic or twitch, clenching of the jaw, widening of eyes, tightening of the mouth, could lose them the game.....hence the term poker face.
I think a lot of us are pretty good at sussing out the bad apples and wrong 'uns. Call it sixth sense or gut instinct, but often we just sense something is wrong or when someone is telling porkies or mean us harm.
If we listen to what our gut instincts tell us we can't go far wrong and those gut instincts do rely heavily on interpreting body language, even if we aren't consciously aware of what's going on. It's the way our subconscious brain works.
The amygdala, sometimes known as the primitive brain, is always on the lookout for danger signals so that it can send instructions to our body so it can react to perceived threat. The classic flight or fight reaction. And most of those signals come from our gut instincts when we observe body language. In fact our gut is often referred to as our second brain.
Primitive humans did not initially communicate through speech, it would have been largely through body language, with a few grunts and screams, same as most primates.
Of course there are phrases that people use that also give the game away......
Not gonna lie.....great example. You know they are going to lie through their teeth,
With all due respect......the last thing they are going to do is show you respect.
It's a fascinating subject and it can be extremely useful to learn the basics.