Then I began to wonder, could there be any other way to ascertain a preference? Thats when I decided to observe half-smiles or smirks as you might call them. Being mostly around left brained people, I realized that most of them always smirk with the right side of the lip going up (Yay! for me) and so I decided to observe an entirely different set of people - Actors. And no surprise there! About 80% of the smirks I see across TV Shows/Movies shows that actors prefer to smirk with the left side of their lip going up first. Acting, as you may have guessed is a predominantly right brained activity requiring a sense of empathy forcing some aount of 'merging' with the character to be portrayed - something the left brain would find almost impossible.
As an example of what I've been on about, below are pictures of Andrew Scott (who plays Jim Moriarty) and Benedict Cumberbatch (who play Sherlock Holmes) in Steven Moffat's Sherlock.
Andrew Scott has a distinct right-brainer smile..
.. while Benedict has the exact opposite..










