Paul Ekman is probably the world’s leading researcher into emotions and their relationship to expression. It was he who discovered that all humans non-verbally express seven basic emotions using the same facial muscles; they’re hard-wired in our brain, not taught culturally.
What he has to say in this area is interesting enough, but his findings about the relationship between the physical signaling of emotion (particularly) in our faces, and the intensity of that emotion, opens up a wealth of possible uses in the realms of therapy and personal development. It emphasises the importance of the role of the body in the mind/body connection.
