The human heart emits the strongest electromagnetic field in our body. This electromagnetic field envelops the entire body extending out in all directions, and it can be measured up to several feet outside of the body. Research from the Institute of HeartMath shows that this emotional information is encoded in this energetic field. HeartMath researchers have also seen that as we consciously focus on feeling a positive emotion - such as care, appreciation, compassion or love - it has a beneficial effect on our own health and well-being, and can have a positive affect on those around us.See:Institute of HeartMath
The site above was referred by someone in place of the question with regard to Intelligence in the Subconscious.
I can speak on this subject because of the research path I took independent of the system described above. So I have developed many insights with regard to the heart on my own that ring with the same understanding that the site above speaks too.
See Also: The Heart Connection