I wonder a lot if this is true, and if so, it's affects on abhinaya and what it means for a dancer trying to express stories through facial expressions to a global crowd.
But there are a lot of culturally learned ways of displaying emotions as well. Note the recent investigations of an anthropologist who realized that eastern and western emoticons might be different for a reason as well...
And then how does rasa theory play into all of this? Oxytocin seems to play a role in how well we interpret emotions on a very general sixth sense level, and training also allows us to understand micro-expressions extremely well (like Paul Ekman's research).
I wonder if a study can be created to isolate and understand these components in how we understand art?
This is certainly an incomplete post. More to be pondered later.
Charles Darwin, The Expression of the Emotions in Man and Animals