Which is the Seat of Spirit, the Heart or the Brain?

In the modern medical science, the brain is the seat of consciousness, thought, memory, and emotion. But in the traditional Chinese medical science, such a seat is ascribed to the heart. Not only ancient Chinese, but also ancient Egyptian, thought that the heart is the seat of spirit. Aristotle also regarded the heart as the source of consciousness and the center of thought. In the English language, there are many such kind of idioms such as “at heart”, “by heart”, “free heart”, “false heart”, “go home to ones heart”, and “be enthroned in the hearts of”.