The nearest thing to real-life Vulcans

This is absolutely fascinating.

"...a damaged neural circuit involved in emotional processing might prevent sadness, happiness or anger from bursting into consciousness. (Using the analogy of the Russian doll, their emotions are breaking down at the second shell of feeling – their bodies are reacting normally, but the sensations don’t merge to form an emotional thought or feeling.) "

"Without the emotional outlet, however, the mind could get stuck on the physical feelings, potentially amplifying the responses. As Goerlich-Dobre puts it: “They are hypersensitive to bodily perceptions, and not able to focus on anything else, which might be one reason why they develop chronic pain.”

"Caleb may not have been transported to ecstasy by his wedding or the birth of his child, but he has spent most of his life looking within, striving to feel and understand the sensations of himself and the people around him. The result is that he is certainly one of the most thoughtful, and self-aware, people I have ever had the pleasure of interviewing – someone who seems to know himself, and his limitations, inside out."
http://www.bbc.com/future/story/20150818-what-is-it-like-to-have-never-felt-an-emotion