A little while ago Jonah Lehrer (here) posted a blog on the work of A. Damasio and A. Bechara.
Why would being able to count your heartbeats lead to better performance at a card game? The answer tells us something interesting about the “body loop,” and the importance of eavesdropping on those subtle emotions reverberating through our flesh. As William James hypothesized back in 1882, every emotion begins as a series of physiological changes in the body; our metaphysical feelings have a very carnal source. “What kind of an emotion of fear,” James wondered, “would be left [after seeing a bear in the woods] if the feeling of quickened heart beats nor of shallow breathing, neither of trembling lips nor of weakened limbs, neither of goose bumps nor of visceral stirrings, were present?” James’ answer was simple: without the body there would be no fear. We need the body in order to feel.
Damasio believes that emotion has a central role in rational thought. Feelings are indispensable.