Quote Originally Posted by Bulldog Psion View Post
One thing I'm interested in is the source of the photos. Are these people pretending to have the given emotion, or are these actual photos of people whose mood was somehow later identifiable but who were reacting naturally to something at the time, and didn't know their pictures would be used for this purpose?

If they're acting for it, I can see that as skewing the results upward because of the natural tendency to exaggerate the emotional signals when you're pretending. "Hamming it up" for the camera, in effect.
They're from '80s magazines; I think it's marginally difficult to get truly natural expressions of many emotions in any remotely ethical manner. But as long as everyone's looking at the same pictures it should be possible to get a </=/> comparison even if people do better in the "lab" than they would in a bar.