I got 15 by just picking the ones that reminded me of my fake smile as genuine, and the ones that didn't as fake, funnily enough.
Idiokratik wrote:
15 out of 20. I was looking for the expression after the smile.
Same, somewhat.
The ones that I missed which were genuine were when I misread the relaxing of the muscles.
I can see the musculature of a human anatomy in my head though, and am aware that the ones around the eyes are much harder to trigger at will in a realistic fashion, so I deliberately work those when I fake a smile to make it look real.
If I didn't have the practice in front of a mirror years ago to fake a good one, and didn't think to choose the ones that looked like my fakes, I doubt I'd do well.
Doing this while talking to someone simultaneously though, gimme a test where they ask you to type out what was said through the speakers while judging the smile.