I reccomend you to read Paul ekam books on the subject, If I don’t recall wrong Lie to me is based on his researches on Micro expressions.
And yes we actually have involuntary expression that manifest our emotions, but you need to train yourself to spot them in others and that’s actually an hard thing to do cause their duration is very short
I don’t have a scientific explanation and I can’t explain more to you, cause I don’t have a deep knowledge of the subject
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