I love shit like this. three cheers for paul eckman. I mean five cheers?
enjoyment smile: five distinct markers differentiate the enjoyment smile from other types of smiles: the presence of orbicularis oculi action in conjunction with the zygomatic major (Duchenne's smile), symmetrical action of the zygomatic major on both sides of the face, zygomatic major actions which are smooth and not irregular, duration of zygomatic major action that is consistent from one enjoyment smile to the next, and synchronous action of the zygomatic major and the orbicularis oculi such that they reach maximal contraction at about the same time.
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