The heart can sense the outside world with much more than the five senses provide and can know and understand much than is considered invisible, or beyond the five senses.
The heart can also sense every organ inside the human body and respond to the needs of respiration, circulation, nutrition and all of the bodily systems. The highly developed heart can assume the autonomic aspects of the cardiovascular system and control circulation, respiration and many other aspects of maintaining internal equilibrium.
The pulse of the heart is the voice of the divine, both inside and outside of the human being. Heart perception is far beyond what science understands about this Holy Grail of human consciousness.