Interesting read it reminds me when I used to be on client sites at the start of my career. With a bit of practice you can tell when someone’s lying to you. Especially in a 121 coaching sessions. Those head movements can tell you a lot in my opinion
Body language can differ between cultures, too. It can be considered impolite in many Asian countries to maintain eye contact while talking with someone, for example, while smiling can mean different things depending on the cultural context.
How to crack the subtle body language of liars - BBC Science Focus Magazine