See #3 then. There still must be some transmission of information, a medium through which signals propagate and an algorithm by which they are encoded/decoded. It's got to come through vision, hearing, or one of the other five senses, and it's got to be a flexible enough system that (apparently) complex ideas can be transmitted and understood with a high degree of accuracy.

Not saying it's impossible, but I'd like to see something a little more robust than 'mirror neurons.' MNs have become sort of a catch-all in when people are trying to explain how some seemingly inexplicable phenomena happens in the brain.

Blessings

~ND