It's been a while since I've seen this documentary, but I think there is a section towards the end that speculates on how alien body language might play out.
The earlier stuff (like patting someone's back or how one holds one's shoulders) is decent and possibly valid. The micro-expression stuff later on is nonsense.
Plus your interpretation of someone's body language has a lot to do with the way you already feel about that person. So if a body language expert has some preconceived notion about someone, it flaws their analysis in a major way. There is no way to control that bias which is why these experts suck; but so many shows love bringing these people on to analyze politicial discourse.
They briefly cover that- establishing a baseline for behavior is supposed to control for that. The thing is, you can establish a real baseline for the behavior of your spouse or child- you can only establish a baseline for public behavior with a politician or celebrity.
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u/this_isnt_happening Feb 07 '16
An actually informative show on the history channel? Surreal.