But the article whichever version is used still needs a massive citation needed tag added, and better sources. The monkey stuff seesm to come from the experiment described here:
http://blogs.discovermagazine.com/notrocketscience/2011/02/02/monkey-see-mon...
Trouble is, most easily findable sources are blogs like this:
http://www.healthkicker.com/754153008/the-science-of-facepalm/
Which shows that the definition is not exactly stable.
+1 to this.
I would suggest looking at the Law Enforcement (and other scholarly) work on body language. A few books leap to mind - some that I am sure I have in my library somewhere.
WIll try to dig something up...
Tom