Originally Posted by
Bulldog Psion
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.