A lot has been coming up recently about the heart and coherence. Some people say that love is the vibration of coherence. Recent medical studies have suggested that there may be a zero point field or vortex ring in the left ventricle of the heart. Others speak of the heart as the gateway to other dimensions ...
All this led me a project at http://www.heartmath.org - There's a page with free tools which "incorporate your body's own heart intelligence and capacity for self-healing".
They say: "Heart coherence is a healthful and optimal state for your immune system, cognitive function, communication, creativity, intuition and more."